diff --git a/core/modules/action/tests/src/Kernel/Migrate/d6/MigrateActionConfigsTest.php b/core/modules/action/tests/src/Kernel/Migrate/d6/MigrateActionConfigsTest.php
index bd87724..934a689 100644
--- a/core/modules/action/tests/src/Kernel/Migrate/d6/MigrateActionConfigsTest.php
+++ b/core/modules/action/tests/src/Kernel/Migrate/d6/MigrateActionConfigsTest.php
@@ -32,7 +32,7 @@ protected function setUp() {
    */
   public function testActionSettings() {
     $config = $this->config('action.settings');
-    $this->assertIdentical(35, $config->get('recursion_limit'));
+    $this->assertSame(35, $config->get('recursion_limit'));
     $this->assertConfigSchema(\Drupal::service('config.typed'), 'action.settings', $config->get());
   }
 
diff --git a/core/modules/action/tests/src/Kernel/Migrate/d6/MigrateActionsTest.php b/core/modules/action/tests/src/Kernel/Migrate/d6/MigrateActionsTest.php
index 1737715..fff91bb 100644
--- a/core/modules/action/tests/src/Kernel/Migrate/d6/MigrateActionsTest.php
+++ b/core/modules/action/tests/src/Kernel/Migrate/d6/MigrateActionsTest.php
@@ -63,10 +63,10 @@ protected function assertEntity($id, $label, $type, $configuration) {
 
     $this->assertTrue($action instanceof Action);
     /** @var \Drupal\system\Entity\Action $action */
-    $this->assertIdentical($id, $action->id());
-    $this->assertIdentical($label, $action->label());
-    $this->assertIdentical($type, $action->getType());
-    $this->assertIdentical($configuration, $action->get('configuration'));
+    $this->assertSame($id, $action->id());
+    $this->assertSame($label, $action->label());
+    $this->assertSame($type, $action->getType());
+    $this->assertSame($configuration, $action->get('configuration'));
   }
 
 }
diff --git a/core/modules/action/tests/src/Kernel/Migrate/d7/MigrateActionsTest.php b/core/modules/action/tests/src/Kernel/Migrate/d7/MigrateActionsTest.php
index 1601449..30de0c3 100644
--- a/core/modules/action/tests/src/Kernel/Migrate/d7/MigrateActionsTest.php
+++ b/core/modules/action/tests/src/Kernel/Migrate/d7/MigrateActionsTest.php
@@ -63,10 +63,10 @@ protected function assertEntity($id, $label, $type, $configuration) {
 
     $this->assertTrue($action instanceof Action);
     /** @var \Drupal\system\Entity\Action $action */
-    $this->assertIdentical($id, $action->id());
-    $this->assertIdentical($label, $action->label());
-    $this->assertIdentical($type, $action->getType());
-    $this->assertIdentical($configuration, $action->get('configuration'));
+    $this->assertSame($id, $action->id());
+    $this->assertSame($label, $action->label());
+    $this->assertSame($type, $action->getType());
+    $this->assertSame($configuration, $action->get('configuration'));
   }
 
 }
diff --git a/core/modules/aggregator/tests/src/Kernel/Migrate/d6/MigrateAggregatorConfigsTest.php b/core/modules/aggregator/tests/src/Kernel/Migrate/d6/MigrateAggregatorConfigsTest.php
index 280a103..79c250b 100644
--- a/core/modules/aggregator/tests/src/Kernel/Migrate/d6/MigrateAggregatorConfigsTest.php
+++ b/core/modules/aggregator/tests/src/Kernel/Migrate/d6/MigrateAggregatorConfigsTest.php
@@ -32,13 +32,13 @@ protected function setUp() {
    */
   public function testAggregatorSettings() {
     $config = $this->config('aggregator.settings');
-    $this->assertIdentical('aggregator', $config->get('fetcher'));
-    $this->assertIdentical('aggregator', $config->get('parser'));
-    $this->assertIdentical(['aggregator'], $config->get('processors'));
-    $this->assertIdentical(600, $config->get('items.teaser_length'));
-    $this->assertIdentical('<a> <b> <br /> <dd> <dl> <dt> <em> <i> <li> <ol> <p> <strong> <u> <ul>', $config->get('items.allowed_html'));
-    $this->assertIdentical(9676800, $config->get('items.expire'));
-    $this->assertIdentical(3, $config->get('source.list_max'));
+    $this->assertSame('aggregator', $config->get('fetcher'));
+    $this->assertSame('aggregator', $config->get('parser'));
+    $this->assertSame(['aggregator'], $config->get('processors'));
+    $this->assertSame(600, $config->get('items.teaser_length'));
+    $this->assertSame('<a> <b> <br /> <dd> <dl> <dt> <em> <i> <li> <ol> <p> <strong> <u> <ul>', $config->get('items.allowed_html'));
+    $this->assertSame(9676800, $config->get('items.expire'));
+    $this->assertSame(3, $config->get('source.list_max'));
     $this->assertConfigSchema(\Drupal::service('config.typed'), 'aggregator.settings', $config->get());
   }
 
diff --git a/core/modules/aggregator/tests/src/Kernel/Migrate/d6/MigrateAggregatorFeedTest.php b/core/modules/aggregator/tests/src/Kernel/Migrate/d6/MigrateAggregatorFeedTest.php
index 9dac60f..36c5600 100644
--- a/core/modules/aggregator/tests/src/Kernel/Migrate/d6/MigrateAggregatorFeedTest.php
+++ b/core/modules/aggregator/tests/src/Kernel/Migrate/d6/MigrateAggregatorFeedTest.php
@@ -32,17 +32,17 @@ protected function setUp() {
   public function testAggregatorFeedImport() {
     /** @var \Drupal\aggregator\Entity\Feed $feed */
     $feed = Feed::load(5);
-    $this->assertIdentical('Know Your Meme', $feed->title->value);
-    $this->assertIdentical('en', $feed->language()->getId());
-    $this->assertIdentical('http://knowyourmeme.com/newsfeed.rss', $feed->url->value);
-    $this->assertIdentical('900', $feed->refresh->value);
-    $this->assertIdentical('1387659487', $feed->checked->value);
-    $this->assertIdentical('0', $feed->queued->value);
-    $this->assertIdentical('http://knowyourmeme.com', $feed->link->value);
-    $this->assertIdentical('New items added to the News Feed', $feed->description->value);
-    $this->assertIdentical('http://b.thumbs.redditmedia.com/harEHsUUZVajabtC.png', $feed->image->value);
-    $this->assertIdentical('"213cc1365b96c310e92053c5551f0504"', $feed->etag->value);
-    $this->assertIdentical('0', $feed->modified->value);
+    $this->assertSame('Know Your Meme', $feed->title->value);
+    $this->assertSame('en', $feed->language()->getId());
+    $this->assertSame('http://knowyourmeme.com/newsfeed.rss', $feed->url->value);
+    $this->assertSame('900', $feed->refresh->value);
+    $this->assertSame('1387659487', $feed->checked->value);
+    $this->assertSame('0', $feed->queued->value);
+    $this->assertSame('http://knowyourmeme.com', $feed->link->value);
+    $this->assertSame('New items added to the News Feed', $feed->description->value);
+    $this->assertSame('http://b.thumbs.redditmedia.com/harEHsUUZVajabtC.png', $feed->image->value);
+    $this->assertSame('"213cc1365b96c310e92053c5551f0504"', $feed->etag->value);
+    $this->assertSame('0', $feed->modified->value);
   }
 
 }
diff --git a/core/modules/aggregator/tests/src/Kernel/Migrate/d6/MigrateAggregatorItemTest.php b/core/modules/aggregator/tests/src/Kernel/Migrate/d6/MigrateAggregatorItemTest.php
index 5343d1e..b81cdd6 100644
--- a/core/modules/aggregator/tests/src/Kernel/Migrate/d6/MigrateAggregatorItemTest.php
+++ b/core/modules/aggregator/tests/src/Kernel/Migrate/d6/MigrateAggregatorItemTest.php
@@ -33,15 +33,15 @@ protected function setUp() {
   public function testAggregatorItem() {
     /** @var \Drupal\aggregator\Entity\Item $item */
     $item = Item::load(1);
-    $this->assertIdentical('1', $item->id());
-    $this->assertIdentical('5', $item->getFeedId());
-    $this->assertIdentical('This (three) weeks in Drupal Core - January 10th 2014', $item->label());
-    $this->assertIdentical('larowlan', $item->getAuthor());
-    $this->assertIdentical("<h2 id='new'>What's new with Drupal 8?</h2>", $item->getDescription());
-    $this->assertIdentical('https://groups.drupal.org/node/395218', $item->getLink());
-    $this->assertIdentical('1389297196', $item->getPostedTime());
-    $this->assertIdentical('en', $item->language()->getId());
-    $this->assertIdentical('395218 at https://groups.drupal.org', $item->getGuid());
+    $this->assertSame('1', $item->id());
+    $this->assertSame('5', $item->getFeedId());
+    $this->assertSame('This (three) weeks in Drupal Core - January 10th 2014', $item->label());
+    $this->assertSame('larowlan', $item->getAuthor());
+    $this->assertSame("<h2 id='new'>What's new with Drupal 8?</h2>", $item->getDescription());
+    $this->assertSame('https://groups.drupal.org/node/395218', $item->getLink());
+    $this->assertSame('1389297196', $item->getPostedTime());
+    $this->assertSame('en', $item->language()->getId());
+    $this->assertSame('395218 at https://groups.drupal.org', $item->getGuid());
 
   }
 
diff --git a/core/modules/aggregator/tests/src/Kernel/Migrate/d7/MigrateAggregatorFeedTest.php b/core/modules/aggregator/tests/src/Kernel/Migrate/d7/MigrateAggregatorFeedTest.php
index fd20823..c00bf86 100644
--- a/core/modules/aggregator/tests/src/Kernel/Migrate/d7/MigrateAggregatorFeedTest.php
+++ b/core/modules/aggregator/tests/src/Kernel/Migrate/d7/MigrateAggregatorFeedTest.php
@@ -32,23 +32,23 @@ protected function setUp() {
   public function testAggregatorFeedImport() {
     /** @var \Drupal\aggregator\FeedInterface $feed */
     $feed = Feed::load(1);
-    $this->assertIdentical('Know Your Meme', $feed->label());
-    $this->assertIdentical('en', $feed->language()->getId());
-    $this->assertIdentical('http://knowyourmeme.com/newsfeed.rss', $feed->getUrl());
-    $this->assertIdentical('900', $feed->getRefreshRate());
+    $this->assertSame('Know Your Meme', $feed->label());
+    $this->assertSame('en', $feed->language()->getId());
+    $this->assertSame('http://knowyourmeme.com/newsfeed.rss', $feed->getUrl());
+    $this->assertSame('900', $feed->getRefreshRate());
     // The feed's last checked time can change as the fixture is updated, so
     // assert that its format is correct.
     $checked_time = $feed->getLastCheckedTime();
     $this->assertTrue(is_numeric($checked_time));
     $this->assertTrue($checked_time > 1000000000);
-    $this->assertIdentical('0', $feed->getQueuedTime());
-    $this->assertIdentical('http://knowyourmeme.com', $feed->link->value);
-    $this->assertIdentical('New items added to the News Feed', $feed->getDescription());
+    $this->assertSame('0', $feed->getQueuedTime());
+    $this->assertSame('http://knowyourmeme.com', $feed->link->value);
+    $this->assertSame('New items added to the News Feed', $feed->getDescription());
     $this->assertNull($feed->getImage());
     // As with getLastCheckedTime(), the etag can change as the fixture is
     // updated normally, so assert that its format is correct.
     $this->assertTrue(preg_match('/^"[a-z0-9]{32}"$/', $feed->getEtag()));
-    $this->assertIdentical('0', $feed->getLastModified());
+    $this->assertSame('0', $feed->getLastModified());
   }
 
 }
diff --git a/core/modules/aggregator/tests/src/Kernel/Migrate/d7/MigrateAggregatorItemTest.php b/core/modules/aggregator/tests/src/Kernel/Migrate/d7/MigrateAggregatorItemTest.php
index 83e59d9..84e42a1 100644
--- a/core/modules/aggregator/tests/src/Kernel/Migrate/d7/MigrateAggregatorItemTest.php
+++ b/core/modules/aggregator/tests/src/Kernel/Migrate/d7/MigrateAggregatorItemTest.php
@@ -42,16 +42,16 @@ public function testAggregatorItem() {
     foreach ($items as $original) {
       /** @var \Drupal\aggregator\ItemInterface $item */
       $item = Item::load($original->iid);
-      $this->assertIdentical($original->fid, $item->getFeedId());
-      $this->assertIdentical($original->title, $item->label());
+      $this->assertSame($original->fid, $item->getFeedId());
+      $this->assertSame($original->title, $item->label());
       // If $original->author is an empty string, getAuthor() returns NULL so
       // we need to use assertEqual() here.
       $this->assertEqual($original->author, $item->getAuthor());
-      $this->assertIdentical($original->description, $item->getDescription());
-      $this->assertIdentical($original->link, $item->getLink());
-      $this->assertIdentical($original->timestamp, $item->getPostedTime());
-      $this->assertIdentical('en', $item->language()->getId());
-      $this->assertIdentical($original->guid, $item->getGuid());
+      $this->assertSame($original->description, $item->getDescription());
+      $this->assertSame($original->link, $item->getLink());
+      $this->assertSame($original->timestamp, $item->getPostedTime());
+      $this->assertSame('en', $item->language()->getId());
+      $this->assertSame($original->guid, $item->getGuid());
     }
   }
 
diff --git a/core/modules/aggregator/tests/src/Kernel/Migrate/d7/MigrateAggregatorSettingsTest.php b/core/modules/aggregator/tests/src/Kernel/Migrate/d7/MigrateAggregatorSettingsTest.php
index 0fa8f63..9368267 100644
--- a/core/modules/aggregator/tests/src/Kernel/Migrate/d7/MigrateAggregatorSettingsTest.php
+++ b/core/modules/aggregator/tests/src/Kernel/Migrate/d7/MigrateAggregatorSettingsTest.php
@@ -27,13 +27,13 @@ protected function setUp() {
    */
   public function testMigration() {
     $config = \Drupal::config('aggregator.settings')->get();
-    $this->assertIdentical('aggregator', $config['fetcher']);
-    $this->assertIdentical('aggregator', $config['parser']);
-    $this->assertIdentical(['aggregator'], $config['processors']);
-    $this->assertIdentical('<p> <div> <a>', $config['items']['allowed_html']);
-    $this->assertIdentical(500, $config['items']['teaser_length']);
-    $this->assertIdentical(86400, $config['items']['expire']);
-    $this->assertIdentical(6, $config['source']['list_max']);
+    $this->assertSame('aggregator', $config['fetcher']);
+    $this->assertSame('aggregator', $config['parser']);
+    $this->assertSame(['aggregator'], $config['processors']);
+    $this->assertSame('<p> <div> <a>', $config['items']['allowed_html']);
+    $this->assertSame(500, $config['items']['teaser_length']);
+    $this->assertSame(86400, $config['items']['expire']);
+    $this->assertSame(6, $config['source']['list_max']);
   }
 
 }
diff --git a/core/modules/big_pipe/src/Tests/BigPipeTest.php b/core/modules/big_pipe/src/Tests/BigPipeTest.php
index a4d5562..7317147 100644
--- a/core/modules/big_pipe/src/Tests/BigPipeTest.php
+++ b/core/modules/big_pipe/src/Tests/BigPipeTest.php
@@ -464,7 +464,7 @@ protected function assertBigPipeNoJsMetaRefreshRedirect() {
 
     // First response: redirect.
     $this->assertEqual('HTTP/1.1 302 Found', $headers[0][':status'], 'The first response was a 302 (redirect).');
-    $this->assertIdentical(0, strpos($headers[0]['set-cookie'], 'big_pipe_nojs=1'), 'The first response sets the big_pipe_nojs cookie.');
+    $this->assertSame(0, strpos($headers[0]['set-cookie'], 'big_pipe_nojs=1'), 'The first response sets the big_pipe_nojs cookie.');
     $this->assertEqual($original_url, $headers[0]['location'], 'The first response redirected back to the original page.');
     $this->assertTrue(empty(array_diff(['cookies:big_pipe_nojs', 'session.exists'], explode(' ', $headers[0]['x-drupal-cache-contexts']))), 'The first response varies by the "cookies:big_pipe_nojs" and "session.exists" cache contexts.');
     $this->assertFalse(isset($headers[0]['surrogate-control']), 'The first response has no "Surrogate-Control" header.');
diff --git a/core/modules/block/src/Tests/BlockTest.php b/core/modules/block/src/Tests/BlockTest.php
index 5910d47..6e36f30 100644
--- a/core/modules/block/src/Tests/BlockTest.php
+++ b/core/modules/block/src/Tests/BlockTest.php
@@ -92,8 +92,8 @@ public function testBlockToggleVisibility() {
     /** @var \Drupal\block\BlockInterface $block */
     $block = Block::load($block_id);
     $visibility_config = $block->getVisibilityConditions()->getConfiguration();
-    $this->assertIdentical([], $visibility_config);
-    $this->assertIdentical([], $block->get('visibility'));
+    $this->assertSame([], $visibility_config);
+    $this->assertSame([], $block->get('visibility'));
   }
 
   /**
@@ -494,7 +494,7 @@ public function testUninstallTheme() {
     $theme_handler->uninstall(['seven']);
 
     // Ensure that the block configuration does not exist anymore.
-    $this->assertIdentical(NULL, Block::load($block->id()));
+    $this->assertSame(NULL, Block::load($block->id()));
   }
 
   /**
diff --git a/core/tests/Drupal/KernelTests/Core/Asset/AttachedAssetsTest.php b/core/tests/Drupal/KernelTests/Core/Asset/AttachedAssetsTest.php
index fa409af..8f1664a 100644
--- a/core/tests/Drupal/KernelTests/Core/Asset/AttachedAssetsTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Asset/AttachedAssetsTest.php
@@ -70,7 +70,7 @@ public function testLibraryUnknown() {
     $build['#attached']['library'][] = 'core/unknown';
     $assets = AttachedAssets::createFromRenderArray($build);
 
-    $this->assertIdentical([], $this->assetResolver->getJsAssets($assets, FALSE)[0], 'Unknown library was not added to the page.');
+    $this->assertSame([], $this->assetResolver->getJsAssets($assets, FALSE)[0], 'Unknown library was not added to the page.');
   }
 
   /**
@@ -210,17 +210,17 @@ public function testSettings() {
 
     // Test whether the settings for core/drupalSettings are available.
     $this->assertTrue(isset($parsed_settings['path']['baseUrl']), 'drupalSettings.path.baseUrl is present.');
-    $this->assertIdentical($parsed_settings['path']['pathPrefix'], 'yarhar', 'drupalSettings.path.pathPrefix is present and has the correct (overridden) value.');
-    $this->assertIdentical($parsed_settings['path']['currentPath'], '', 'drupalSettings.path.currentPath is present and has the correct value.');
-    $this->assertIdentical($parsed_settings['path']['currentPathIsAdmin'], FALSE, 'drupalSettings.path.currentPathIsAdmin is present and has the correct value.');
-    $this->assertIdentical($parsed_settings['path']['isFront'], FALSE, 'drupalSettings.path.isFront is present and has the correct value.');
-    $this->assertIdentical($parsed_settings['path']['currentLanguage'], 'en', 'drupalSettings.path.currentLanguage is present and has the correct value.');
+    $this->assertSame('yarhar', $parsed_settings['path']['pathPrefix'], 'drupalSettings.path.pathPrefix is present and has the correct (overridden) value.');
+    $this->assertSame('', $parsed_settings['path']['currentPath'], 'drupalSettings.path.currentPath is present and has the correct value.');
+    $this->assertSame(FALSE, $parsed_settings['path']['currentPathIsAdmin'], 'drupalSettings.path.currentPathIsAdmin is present and has the correct value.');
+    $this->assertSame(FALSE, $parsed_settings['path']['isFront'], 'drupalSettings.path.isFront is present and has the correct value.');
+    $this->assertSame('en', $parsed_settings['path']['currentLanguage'], 'drupalSettings.path.currentLanguage is present and has the correct value.');
 
     // Tests whether altering JavaScript settings via hook_js_settings_alter()
     // is working as expected.
     // @see common_test_js_settings_alter()
-    $this->assertIdentical($parsed_settings['pluralDelimiter'], '☃');
-    $this->assertIdentical($parsed_settings['foo'], 'bar');
+    $this->assertSame('☃', $parsed_settings['pluralDelimiter']);
+    $this->assertSame('bar', $parsed_settings['foo']);
   }
 
   /**
@@ -318,7 +318,7 @@ public function testRenderOrder() {
     else {
       $result = [];
     }
-    $this->assertIdentical($result, $expected_order_js, 'JavaScript is added in the expected weight order.');
+    $this->assertSame($expected_order_js, $result, 'JavaScript is added in the expected weight order.');
 
     // Construct the expected result from the regex.
     $expected_order_css = [
@@ -360,7 +360,7 @@ public function testRenderOrder() {
     else {
       $result = [];
     }
-    $this->assertIdentical($result, $expected_order_css, 'CSS is added in the expected weight order.');
+    $this->assertSame($expected_order_css, $result, 'CSS is added in the expected weight order.');
   }
 
   /**
@@ -435,12 +435,12 @@ public function testDynamicLibrary() {
     $dynamic_library = $library_discovery->getLibraryByName('common_test', 'dynamic_library');
     $this->assertTrue(is_array($dynamic_library));
     if ($this->assertTrue(isset($dynamic_library['version']))) {
-      $this->assertIdentical('1.0', $dynamic_library['version']);
+      $this->assertSame('1.0', $dynamic_library['version']);
     }
     // Make sure the dynamic library definition could be altered.
     // @see common_test_library_info_alter()
     if ($this->assertTrue(isset($dynamic_library['dependencies']))) {
-      $this->assertIdentical(['core/jquery'], $dynamic_library['dependencies']);
+      $this->assertSame(['core/jquery'], $dynamic_library['dependencies']);
     }
   }
 
diff --git a/core/tests/Drupal/KernelTests/Core/Bootstrap/GetFilenameTest.php b/core/tests/Drupal/KernelTests/Core/Bootstrap/GetFilenameTest.php
index 4c54487..942b36d 100644
--- a/core/tests/Drupal/KernelTests/Core/Bootstrap/GetFilenameTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Bootstrap/GetFilenameTest.php
@@ -36,18 +36,18 @@ public function testDrupalGetFilename() {
     system_rebuild_module_data();
 
     // Retrieving the location of a module.
-    $this->assertIdentical(drupal_get_filename('module', 'system'), 'core/modules/system/system.info.yml');
+    $this->assertSame('core/modules/system/system.info.yml', drupal_get_filename('module', 'system'));
 
     // Retrieving the location of a theme.
     \Drupal::service('theme_handler')->install(['stark']);
-    $this->assertIdentical(drupal_get_filename('theme', 'stark'), 'core/themes/stark/stark.info.yml');
+    $this->assertSame('core/themes/stark/stark.info.yml', drupal_get_filename('theme', 'stark'));
 
     // Retrieving the location of a theme engine.
-    $this->assertIdentical(drupal_get_filename('theme_engine', 'twig'), 'core/themes/engines/twig/twig.info.yml');
+    $this->assertSame('core/themes/engines/twig/twig.info.yml', drupal_get_filename('theme_engine', 'twig'));
 
     // Retrieving the location of a profile. Profiles are a special case with
     // a fixed location and naming.
-    $this->assertIdentical(drupal_get_filename('profile', 'testing'), 'core/profiles/testing/testing.info.yml');
+    $this->assertSame('core/profiles/testing/testing.info.yml', drupal_get_filename('profile', 'testing'));
 
 
     // Generate a non-existing module name.
diff --git a/core/tests/Drupal/KernelTests/Core/Cache/DatabaseBackendTest.php b/core/tests/Drupal/KernelTests/Core/Cache/DatabaseBackendTest.php
index de8bbda..04bbdc6 100644
--- a/core/tests/Drupal/KernelTests/Core/Cache/DatabaseBackendTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Cache/DatabaseBackendTest.php
@@ -40,12 +40,12 @@ public function testSetGet() {
     $cid_long = str_repeat('愛€', 500);
     $cached_value_long = $this->randomMachineName();
     $backend->set($cid_long, $cached_value_long);
-    $this->assertIdentical($cached_value_long, $backend->get($cid_long)->data, "Backend contains the correct value for long, non-ASCII cache id.");
+    $this->assertSame($cached_value_long, $backend->get($cid_long)->data, "Backend contains the correct value for long, non-ASCII cache id.");
 
     $cid_short = '愛1€';
     $cached_value_short = $this->randomMachineName();
     $backend->set($cid_short, $cached_value_short);
-    $this->assertIdentical($cached_value_short, $backend->get($cid_short)->data, "Backend contains the correct value for short, non-ASCII cache id.");
+    $this->assertSame($cached_value_short, $backend->get($cid_short)->data, "Backend contains the correct value for short, non-ASCII cache id.");
   }
 
 }
diff --git a/core/tests/Drupal/KernelTests/Core/Cache/GenericCacheBackendUnitTestBase.php b/core/tests/Drupal/KernelTests/Core/Cache/GenericCacheBackendUnitTestBase.php
index 4e57a71..81019c9 100644
--- a/core/tests/Drupal/KernelTests/Core/Cache/GenericCacheBackendUnitTestBase.php
+++ b/core/tests/Drupal/KernelTests/Core/Cache/GenericCacheBackendUnitTestBase.php
@@ -130,22 +130,22 @@ protected function tearDown() {
   public function testSetGet() {
     $backend = $this->getCacheBackend();
 
-    $this->assertIdentical(FALSE, $backend->get('test1'), "Backend does not contain data for cache id test1.");
+    $this->assertSame(FALSE, $backend->get('test1'), "Backend does not contain data for cache id test1.");
     $with_backslash = ['foo' => '\Drupal\foo\Bar'];
     $backend->set('test1', $with_backslash);
     $cached = $backend->get('test1');
     $this->assert(is_object($cached), "Backend returned an object for cache id test1.");
-    $this->assertIdentical($with_backslash, $cached->data);
+    $this->assertSame($with_backslash, $cached->data);
     $this->assertTrue($cached->valid, 'Item is marked as valid.');
     // We need to round because microtime may be rounded up in the backend.
     $this->assertTrue($cached->created >= REQUEST_TIME && $cached->created <= round(microtime(TRUE), 3), 'Created time is correct.');
     $this->assertEqual($cached->expire, Cache::PERMANENT, 'Expire time is correct.');
 
-    $this->assertIdentical(FALSE, $backend->get('test2'), "Backend does not contain data for cache id test2.");
+    $this->assertSame(FALSE, $backend->get('test2'), "Backend does not contain data for cache id test2.");
     $backend->set('test2', ['value' => 3], REQUEST_TIME + 3);
     $cached = $backend->get('test2');
     $this->assert(is_object($cached), "Backend returned an object for cache id test2.");
-    $this->assertIdentical(['value' => 3], $cached->data);
+    $this->assertSame(['value' => 3], $cached->data);
     $this->assertTrue($cached->valid, 'Item is marked as valid.');
     $this->assertTrue($cached->created >= REQUEST_TIME && $cached->created <= round(microtime(TRUE), 3), 'Created time is correct.');
     $this->assertEqual($cached->expire, REQUEST_TIME + 3, 'Expire time is correct.');
@@ -158,22 +158,22 @@ public function testSetGet() {
     $this->assertTrue($cached->created >= REQUEST_TIME && $cached->created <= round(microtime(TRUE), 3), 'Created time is correct.');
     $this->assertEqual($cached->expire, REQUEST_TIME - 3, 'Expire time is correct.');
 
-    $this->assertIdentical(FALSE, $backend->get('test4'), "Backend does not contain data for cache id test4.");
+    $this->assertSame(FALSE, $backend->get('test4'), "Backend does not contain data for cache id test4.");
     $with_eof = ['foo' => "\nEOF\ndata"];
     $backend->set('test4', $with_eof);
     $cached = $backend->get('test4');
     $this->assert(is_object($cached), "Backend returned an object for cache id test4.");
-    $this->assertIdentical($with_eof, $cached->data);
+    $this->assertSame($with_eof, $cached->data);
     $this->assertTrue($cached->valid, 'Item is marked as valid.');
     $this->assertTrue($cached->created >= REQUEST_TIME && $cached->created <= round(microtime(TRUE), 3), 'Created time is correct.');
     $this->assertEqual($cached->expire, Cache::PERMANENT, 'Expire time is correct.');
 
-    $this->assertIdentical(FALSE, $backend->get('test5'), "Backend does not contain data for cache id test5.");
+    $this->assertSame(FALSE, $backend->get('test5'), "Backend does not contain data for cache id test5.");
     $with_eof_and_semicolon = ['foo' => "\nEOF;\ndata"];
     $backend->set('test5', $with_eof_and_semicolon);
     $cached = $backend->get('test5');
     $this->assert(is_object($cached), "Backend returned an object for cache id test5.");
-    $this->assertIdentical($with_eof_and_semicolon, $cached->data);
+    $this->assertSame($with_eof_and_semicolon, $cached->data);
     $this->assertTrue($cached->valid, 'Item is marked as valid.');
     $this->assertTrue($cached->created >= REQUEST_TIME && $cached->created <= round(microtime(TRUE), 3), 'Created time is correct.');
     $this->assertEqual($cached->expire, Cache::PERMANENT, 'Expire time is correct.');
@@ -182,7 +182,7 @@ public function testSetGet() {
     $backend->set('test6', $with_variable);
     $cached = $backend->get('test6');
     $this->assert(is_object($cached), "Backend returned an object for cache id test6.");
-    $this->assertIdentical($with_variable, $cached->data);
+    $this->assertSame($with_variable, $cached->data);
 
     // Make sure that a cached object is not affected by changing the original.
     $data = new \stdClass();
@@ -229,26 +229,26 @@ public function testSetGet() {
   public function testDelete() {
     $backend = $this->getCacheBackend();
 
-    $this->assertIdentical(FALSE, $backend->get('test1'), "Backend does not contain data for cache id test1.");
+    $this->assertSame(FALSE, $backend->get('test1'), "Backend does not contain data for cache id test1.");
     $backend->set('test1', 7);
     $this->assert(is_object($backend->get('test1')), "Backend returned an object for cache id test1.");
 
-    $this->assertIdentical(FALSE, $backend->get('test2'), "Backend does not contain data for cache id test2.");
+    $this->assertSame(FALSE, $backend->get('test2'), "Backend does not contain data for cache id test2.");
     $backend->set('test2', 3);
     $this->assert(is_object($backend->get('test2')), "Backend returned an object for cache id %cid.");
 
     $backend->delete('test1');
-    $this->assertIdentical(FALSE, $backend->get('test1'), "Backend does not contain data for cache id test1 after deletion.");
+    $this->assertSame(FALSE, $backend->get('test1'), "Backend does not contain data for cache id test1 after deletion.");
 
     $this->assert(is_object($backend->get('test2')), "Backend still has an object for cache id test2.");
 
     $backend->delete('test2');
-    $this->assertIdentical(FALSE, $backend->get('test2'), "Backend does not contain data for cache id test2 after deletion.");
+    $this->assertSame(FALSE, $backend->get('test2'), "Backend does not contain data for cache id test2 after deletion.");
 
     $long_cid = str_repeat('a', 300);
     $backend->set($long_cid, 'test');
     $backend->delete($long_cid);
-    $this->assertIdentical(FALSE, $backend->get($long_cid), "Backend does not contain data for long cache id after deletion.");
+    $this->assertSame(FALSE, $backend->get($long_cid), "Backend does not contain data for long cache id after deletion.");
   }
 
   /**
@@ -275,7 +275,7 @@ public function testValueTypeIsKept() {
     foreach ($variables as $cid => $value) {
       $object = $backend->get($cid);
       $this->assert(is_object($object), sprintf("Backend returned an object for cache id %s.", $cid));
-      $this->assertIdentical($value, $object->data, sprintf("Data of cached id %s kept is identical in type and value", $cid));
+      $this->assertSame($value, $object->data, sprintf("Data of cached id %s kept is identical in type and value", $cid));
     }
   }
 
@@ -321,10 +321,10 @@ public function testGetMultiple() {
     $this->assertFalse(isset($ret['test19']), "Nonexistent cache id test19 is not set.");
     $this->assertFalse(isset($ret['test21']), "Nonexistent cache id test21 is not set.");
     // Test values.
-    $this->assertIdentical($ret['test2']->data, 3, "Existing cache id test2 has the correct value.");
-    $this->assertIdentical($ret['test3']->data, 5, "Existing cache id test3 has the correct value.");
-    $this->assertIdentical($ret['test6']->data, 13, "Existing cache id test6 has the correct value.");
-    $this->assertIdentical($ret['test7']->data, 17, "Existing cache id test7 has the correct value.");
+    $this->assertSame(3, $ret['test2']->data, "Existing cache id test2 has the correct value.");
+    $this->assertSame(5, $ret['test3']->data, "Existing cache id test3 has the correct value.");
+    $this->assertSame(13, $ret['test6']->data, "Existing cache id test6 has the correct value.");
+    $this->assertSame(17, $ret['test7']->data, "Existing cache id test7 has the correct value.");
     // Test $cids array - ensure it contains cache id's that do not exist.
     $this->assert(in_array('test19', $cids), "Nonexistent cache id test19 is in cids array.");
     $this->assert(in_array('test21', $cids), "Nonexistent cache id test21 is in cids array.");
@@ -351,9 +351,9 @@ public function testGetMultiple() {
     $this->assertFalse(isset($ret['test6']), "Deleted cache id test6 is not set");
     $this->assertFalse(isset($ret['test21']), "Nonexistent cache id test21 is not set");
     // Test values.
-    $this->assertIdentical($ret['test2']->data, 3, "Existing cache id test2 has the correct value.");
-    $this->assertIdentical($ret['test7']->data, 17, "Existing cache id test7 has the correct value.");
-    $this->assertIdentical($ret['test19']->data, 57, "Added cache id test19 has the correct value.");
+    $this->assertSame(3, $ret['test2']->data, "Existing cache id test2 has the correct value.");
+    $this->assertSame(17, $ret['test7']->data, "Existing cache id test7 has the correct value.");
+    $this->assertSame(57, $ret['test19']->data, "Added cache id test19 has the correct value.");
     // Test $cids array - ensure it contains cache id's that do not exist.
     $this->assert(in_array('test3', $cids), "Deleted cache id test3 is in cids array.");
     $this->assert(in_array('test6', $cids), "Deleted cache id test6 is in cids array.");
@@ -450,10 +450,10 @@ public function testDeleteMultiple() {
     ]);
 
     // Test if expected keys have been deleted.
-    $this->assertIdentical(FALSE, $backend->get('test1'), "Cache id test1 deleted.");
-    $this->assertIdentical(FALSE, $backend->get('test3'), "Cache id test3 deleted.");
-    $this->assertIdentical(FALSE, $backend->get('test5'), "Cache id test5 deleted.");
-    $this->assertIdentical(FALSE, $backend->get('test7'), "Cache id test7 deleted.");
+    $this->assertSame(FALSE, $backend->get('test1'), "Cache id test1 deleted.");
+    $this->assertSame(FALSE, $backend->get('test3'), "Cache id test3 deleted.");
+    $this->assertSame(FALSE, $backend->get('test5'), "Cache id test5 deleted.");
+    $this->assertSame(FALSE, $backend->get('test7'), "Cache id test7 deleted.");
 
     // Test if expected keys exist.
     $this->assertNotIdentical(FALSE, $backend->get('test2'), "Cache id test2 exists.");
@@ -461,8 +461,8 @@ public function testDeleteMultiple() {
     $this->assertNotIdentical(FALSE, $backend->get('test6'), "Cache id test6 exists.");
 
     // Test if that expected keys do not exist.
-    $this->assertIdentical(FALSE, $backend->get('test19'), "Cache id test19 does not exist.");
-    $this->assertIdentical(FALSE, $backend->get('test21'), "Cache id test21 does not exist.");
+    $this->assertSame(FALSE, $backend->get('test19'), "Cache id test19 does not exist.");
+    $this->assertSame(FALSE, $backend->get('test21'), "Cache id test21 does not exist.");
 
     // Calling deleteMultiple() with an empty array should not cause an error.
     $this->assertFalse($backend->deleteMultiple([]));
diff --git a/core/tests/Drupal/KernelTests/Core/Command/DbDumpTest.php b/core/tests/Drupal/KernelTests/Core/Command/DbDumpTest.php
index 8129410..c6192da 100644
--- a/core/tests/Drupal/KernelTests/Core/Command/DbDumpTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Command/DbDumpTest.php
@@ -205,13 +205,13 @@ public function testScriptLoad() {
       $this->assertTrue(Database::getConnection()
         ->schema()
         ->tableExists($table), SafeMarkup::format('Table @table created by the database script.', ['@table' => $table]));
-      $this->assertIdentical($this->originalTableSchemas[$table], $this->getTableSchema($table), SafeMarkup::format('The schema for @table was properly restored.', ['@table' => $table]));
-      $this->assertIdentical($this->originalTableIndexes[$table], $this->getTableIndexes($table), SafeMarkup::format('The indexes for @table were properly restored.', ['@table' => $table]));
+      $this->assertSame($this->originalTableSchemas[$table], $this->getTableSchema($table), SafeMarkup::format('The schema for @table was properly restored.', ['@table' => $table]));
+      $this->assertSame($this->originalTableIndexes[$table], $this->getTableIndexes($table), SafeMarkup::format('The indexes for @table were properly restored.', ['@table' => $table]));
     }
 
     // Ensure the test config has been replaced.
     $config = unserialize(db_query("SELECT data FROM {config} WHERE name = 'test_config'")->fetchField());
-    $this->assertIdentical($config, $this->data, 'Script has properly restored the config table data.');
+    $this->assertSame($config, $this->data, 'Script has properly restored the config table data.');
 
     // Ensure the cache data was not exported.
     $this->assertFalse(\Drupal::cache('discovery')
diff --git a/core/tests/Drupal/KernelTests/Core/Common/XssUnitTest.php b/core/tests/Drupal/KernelTests/Core/Common/XssUnitTest.php
index 2375487..d83a514 100644
--- a/core/tests/Drupal/KernelTests/Core/Common/XssUnitTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Common/XssUnitTest.php
@@ -48,9 +48,9 @@ public function testBadProtocolStripping() {
     $url = 'javascript:http://www.example.com/?x=1&y=2';
     $expected_plain = 'http://www.example.com/?x=1&y=2';
     $expected_html = 'http://www.example.com/?x=1&amp;y=2';
-    $this->assertIdentical(check_url($url), $expected_html, 'check_url() filters a URL and encodes it for HTML.');
-    $this->assertIdentical(UrlHelper::filterBadProtocol($url), $expected_html, '\Drupal\Component\Utility\UrlHelper::filterBadProtocol() filters a URL and encodes it for HTML.');
-    $this->assertIdentical(UrlHelper::stripDangerousProtocols($url), $expected_plain, '\Drupal\Component\Utility\UrlHelper::stripDangerousProtocols() filters a URL and returns plain text.');
+    $this->assertSame($expected_html, check_url($url), 'check_url() filters a URL and encodes it for HTML.');
+    $this->assertSame($expected_html, UrlHelper::filterBadProtocol($url), '\Drupal\Component\Utility\UrlHelper::filterBadProtocol() filters a URL and encodes it for HTML.');
+    $this->assertSame($expected_plain, UrlHelper::stripDangerousProtocols($url), '\Drupal\Component\Utility\UrlHelper::stripDangerousProtocols() filters a URL and returns plain text.');
 
   }
 
diff --git a/core/tests/Drupal/KernelTests/Core/Config/ConfigCRUDTest.php b/core/tests/Drupal/KernelTests/Core/Config/ConfigCRUDTest.php
index a94b1b8..fc34233 100644
--- a/core/tests/Drupal/KernelTests/Core/Config/ConfigCRUDTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Config/ConfigCRUDTest.php
@@ -43,30 +43,30 @@ public function testCRUD() {
     $name = 'config_test.crud';
 
     $config = $this->config($name);
-    $this->assertIdentical($config->isNew(), TRUE);
+    $this->assertSame(TRUE, $config->isNew());
 
     // Create a new configuration object.
     $config->set('value', 'initial');
     $config->save();
-    $this->assertIdentical($config->isNew(), FALSE);
+    $this->assertSame(FALSE, $config->isNew());
 
     // Verify the active configuration contains the saved value.
     $actual_data = $storage->read($name);
-    $this->assertIdentical($actual_data, ['value' => 'initial']);
+    $this->assertSame(['value' => 'initial'], $actual_data);
 
     // Update the configuration object instance.
     $config->set('value', 'instance-update');
     $config->save();
-    $this->assertIdentical($config->isNew(), FALSE);
+    $this->assertSame(FALSE, $config->isNew());
 
     // Verify the active configuration contains the updated value.
     $actual_data = $storage->read($name);
-    $this->assertIdentical($actual_data, ['value' => 'instance-update']);
+    $this->assertSame(['value' => 'instance-update'], $actual_data);
 
     // Verify a call to $this->config() immediately returns the updated value.
     $new_config = $this->config($name);
-    $this->assertIdentical($new_config->get(), $config->get());
-    $this->assertIdentical($config->isNew(), FALSE);
+    $this->assertSame($config->get(), $new_config->get());
+    $this->assertSame(FALSE, $config->isNew());
 
     // Pollute the config factory static cache.
     $config_factory->getEditable($name);
@@ -75,48 +75,48 @@ public function testCRUD() {
     $config->delete();
 
     // Verify the configuration object is empty.
-    $this->assertIdentical($config->get(), []);
-    $this->assertIdentical($config->isNew(), TRUE);
+    $this->assertSame([], $config->get());
+    $this->assertSame(TRUE, $config->isNew());
 
     // Verify that all copies of the configuration has been removed from the
     // static cache.
-    $this->assertIdentical($config_factory->getEditable($name)->isNew(), TRUE);
+    $this->assertSame(TRUE, $config_factory->getEditable($name)->isNew());
 
     // Verify the active configuration contains no value.
     $actual_data = $storage->read($name);
-    $this->assertIdentical($actual_data, FALSE);
+    $this->assertSame(FALSE, $actual_data);
 
     // Verify $this->config() returns no data.
     $new_config = $this->config($name);
-    $this->assertIdentical($new_config->get(), $config->get());
-    $this->assertIdentical($config->isNew(), TRUE);
+    $this->assertSame($config->get(), $new_config->get());
+    $this->assertSame(TRUE, $config->isNew());
 
     // Re-create the configuration object.
     $config->set('value', 're-created');
     $config->save();
-    $this->assertIdentical($config->isNew(), FALSE);
+    $this->assertSame(FALSE, $config->isNew());
 
     // Verify the active configuration contains the updated value.
     $actual_data = $storage->read($name);
-    $this->assertIdentical($actual_data, ['value' => 're-created']);
+    $this->assertSame(['value' => 're-created'], $actual_data);
 
     // Verify a call to $this->config() immediately returns the updated value.
     $new_config = $this->config($name);
-    $this->assertIdentical($new_config->get(), $config->get());
-    $this->assertIdentical($config->isNew(), FALSE);
+    $this->assertSame($config->get(), $new_config->get());
+    $this->assertSame(FALSE, $config->isNew());
 
     // Rename the configuration object.
     $new_name = 'config_test.crud_rename';
     $this->container->get('config.factory')->rename($name, $new_name);
     $renamed_config = $this->config($new_name);
-    $this->assertIdentical($renamed_config->get(), $config->get());
-    $this->assertIdentical($renamed_config->isNew(), FALSE);
+    $this->assertSame($config->get(), $renamed_config->get());
+    $this->assertSame(FALSE, $renamed_config->isNew());
 
     // Ensure that the old configuration object is removed from both the cache
     // and the configuration storage.
     $config = $this->config($name);
-    $this->assertIdentical($config->get(), []);
-    $this->assertIdentical($config->isNew(), TRUE);
+    $this->assertSame([], $config->get());
+    $this->assertSame(TRUE, $config->isNew());
 
     // Test renaming when config.factory does not have the object in its static
     // cache.
@@ -129,12 +129,12 @@ public function testCRUD() {
     $new_name = 'config_test.crud_rename_no_cache';
     $config_factory->rename($name, $new_name);
     $renamed_config = $config_factory->get($new_name);
-    $this->assertIdentical($renamed_config->get(), $config->get());
-    $this->assertIdentical($renamed_config->isNew(), FALSE);
+    $this->assertSame($config->get(), $renamed_config->get());
+    $this->assertSame(FALSE, $renamed_config->isNew());
     // Ensure the overrides static cache has been cleared.
-    $this->assertIdentical($config_factory->get($name)->isNew(), TRUE);
+    $this->assertSame(TRUE, $config_factory->get($name)->isNew());
     // Ensure the non-overrides static cache has been cleared.
-    $this->assertIdentical($config_factory->getEditable($name)->isNew(), TRUE);
+    $this->assertSame(TRUE, $config_factory->getEditable($name)->isNew());
 
     // Merge data into the configuration object.
     $new_config = $this->config($new_name);
@@ -144,8 +144,8 @@ public function testCRUD() {
     ];
     $new_config->merge($expected_values);
     $new_config->save();
-    $this->assertIdentical($new_config->get('value'), $expected_values['value']);
-    $this->assertIdentical($new_config->get('404'), $expected_values['404']);
+    $this->assertSame($expected_values['value'], $new_config->get('value'));
+    $this->assertSame($expected_values['404'], $new_config->get('404'));
 
     // Test that getMultiple() does not return new config objects that were
     // previously accessed with get()
@@ -260,30 +260,30 @@ public function testDataTypes() {
       'string_int' => '1',
     ];
     $data['_core']['default_config_hash'] = Crypt::hashBase64(serialize($data));
-    $this->assertIdentical($config->get(), $data);
+    $this->assertSame($data, $config->get());
 
     // Re-set each key using Config::set().
     foreach ($data as $key => $value) {
       $config->set($key, $value);
     }
     $config->save();
-    $this->assertIdentical($config->get(), $data);
+    $this->assertSame($data, $config->get());
     // Assert the data against the file storage.
-    $this->assertIdentical($storage->read($name), $data);
+    $this->assertSame($data, $storage->read($name));
     $this->verbose('<pre>' . $name . var_export($storage->read($name), TRUE));
 
     // Set data using config::setData().
     $config->setData($data)->save();
-    $this->assertIdentical($config->get(), $data);
-    $this->assertIdentical($storage->read($name), $data);
+    $this->assertSame($data, $config->get());
+    $this->assertSame($data, $storage->read($name));
 
     // Test that schema type enforcement can be overridden by trusting the data.
-    $this->assertIdentical(99, $config->get('int'));
+    $this->assertSame(99, $config->get('int'));
     $config->set('int', '99')->save(TRUE);
-    $this->assertIdentical('99', $config->get('int'));
+    $this->assertSame('99', $config->get('int'));
     // Test that re-saving without testing the data enforces the schema type.
     $config->save();
-    $this->assertIdentical($data, $config->get());
+    $this->assertSame($data, $config->get());
 
     // Test that setting an unsupported type for a config object with a schema
     // fails.
diff --git a/core/tests/Drupal/KernelTests/Core/Config/ConfigDependencyTest.php b/core/tests/Drupal/KernelTests/Core/Config/ConfigDependencyTest.php
index 79b01cb..7bc7fcc 100644
--- a/core/tests/Drupal/KernelTests/Core/Config/ConfigDependencyTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Config/ConfigDependencyTest.php
@@ -328,7 +328,7 @@ public function testConfigEntityUninstallComplex(array $entity_id_suffixes) {
 
     $called = \Drupal::state()->get('config_test.on_dependency_removal_called', []);
     $this->assertFalse(in_array($entity_3->id(), $called), 'ConfigEntityInterface::onDependencyRemoval() is not called for entity 3.');
-    $this->assertIdentical([$entity_1->id(), $entity_4->id(), $entity_2->id()], $called, 'The most dependent entites have ConfigEntityInterface::onDependencyRemoval() called first.');
+    $this->assertSame([$entity_1->id(), $entity_4->id(), $entity_2->id()], $called, 'The most dependent entites have ConfigEntityInterface::onDependencyRemoval() called first.');
 
     // Perform a module rebuild so we can know where the node module is located
     // and uninstall it.
diff --git a/core/tests/Drupal/KernelTests/Core/Config/ConfigDiffTest.php b/core/tests/Drupal/KernelTests/Core/Config/ConfigDiffTest.php
index b69735e..469941c 100644
--- a/core/tests/Drupal/KernelTests/Core/Config/ConfigDiffTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Config/ConfigDiffTest.php
@@ -166,11 +166,11 @@ protected function assertYamlEdit(array $edits, $field, $type, $orig = NULL, $cl
             $this->assertEqual($edit->type, $type, "The $field item in the diff is a $type");
             // If an original value was given, assert that it matches.
             if (isset($orig)) {
-              $this->assertIdentical($edit->orig, $orig, "The original value for key '$field' is correct.");
+              $this->assertSame($orig, $edit->orig, "The original value for key '$field' is correct.");
             }
             // If a closing value was given, assert that it matches.
             if (isset($closing)) {
-              $this->assertIdentical($edit->closing, $closing, "The closing value for key '$field' is correct.");
+              $this->assertSame($closing, $edit->closing, "The closing value for key '$field' is correct.");
             }
             // Break out of the search entirely.
             break 2;
diff --git a/core/tests/Drupal/KernelTests/Core/Config/ConfigEntityNormalizeTest.php b/core/tests/Drupal/KernelTests/Core/Config/ConfigEntityNormalizeTest.php
index 5a137b9..e34af03 100644
--- a/core/tests/Drupal/KernelTests/Core/Config/ConfigEntityNormalizeTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Config/ConfigEntityNormalizeTest.php
@@ -40,7 +40,7 @@ public function testNormalize() {
     $config_entity->save();
 
     $config = $this->config('config_test.dynamic.system');
-    $this->assertIdentical($config_entity->toArray(), $config->getRawData(), 'Stored config entity is equivalent to config schema.');
+    $this->assertSame($config->getRawData(), $config_entity->toArray(), 'Stored config entity is equivalent to config schema.');
   }
 
 }
diff --git a/core/tests/Drupal/KernelTests/Core/Config/ConfigEntityStaticCacheTest.php b/core/tests/Drupal/KernelTests/Core/Config/ConfigEntityStaticCacheTest.php
index 3c3f70b..87102e8 100644
--- a/core/tests/Drupal/KernelTests/Core/Config/ConfigEntityStaticCacheTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Config/ConfigEntityStaticCacheTest.php
@@ -57,7 +57,7 @@ public function testCacheHit() {
     // config_entity_static_cache_test_config_test_load() sets _loadStamp to a
     // random string. If they match, it means $entity_2 was retrieved from the
     // static cache rather than going through a separate load sequence.
-    $this->assertIdentical($entity_1->_loadStamp, $entity_2->_loadStamp);
+    $this->assertSame($entity_1->_loadStamp, $entity_2->_loadStamp);
   }
 
   /**
@@ -73,7 +73,7 @@ public function testReset() {
     $entity->label = 'New label';
     $entity->save();
     $entity = $storage->load($this->entityId);
-    $this->assertIdentical($entity->label, 'New label');
+    $this->assertSame('New label', $entity->label);
 
     // Ensure loading after a delete retrieves NULL rather than an obsolete
     // cached one.
@@ -94,7 +94,7 @@ public function testConfigOverride() {
     // despite the prior cache priming.
     \Drupal::configFactory()->addOverride(new ConfigOverrider());
     $entity_override = $storage->load($this->entityId);
-    $this->assertIdentical($entity_override->label, 'Overridden label');
+    $this->assertSame('Overridden label', $entity_override->label);
 
     // Load override free to ensure that loading the config entity again does
     // not return the overridden value.
@@ -103,10 +103,10 @@ public function testConfigOverride() {
     $this->assertNotIdentical($entity_override->_loadStamp, $entity_no_override->_loadStamp);
 
     // Reload the entity and ensure the cache is used.
-    $this->assertIdentical($storage->loadOverrideFree($this->entityId)->_loadStamp, $entity_no_override->_loadStamp);
+    $this->assertSame($entity_no_override->_loadStamp, $storage->loadOverrideFree($this->entityId)->_loadStamp);
 
     // Enable overrides and reload the entity and ensure the cache is used.
-    $this->assertIdentical($storage->load($this->entityId)->_loadStamp, $entity_override->_loadStamp);
+    $this->assertSame($entity_override->_loadStamp, $storage->load($this->entityId)->_loadStamp);
   }
 
 }
diff --git a/core/tests/Drupal/KernelTests/Core/Config/ConfigEntityStorageTest.php b/core/tests/Drupal/KernelTests/Core/Config/ConfigEntityStorageTest.php
index bf41e1d..265dbf0 100644
--- a/core/tests/Drupal/KernelTests/Core/Config/ConfigEntityStorageTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Config/ConfigEntityStorageTest.php
@@ -48,7 +48,7 @@ public function testUUIDConflict() {
 
     // Ensure that the config entity was not corrupted.
     $entity = entity_load('config_test', $entity->id(), TRUE);
-    $this->assertIdentical($entity->toArray(), $original_properties);
+    $this->assertSame($original_properties, $entity->toArray());
   }
 
 }
diff --git a/core/tests/Drupal/KernelTests/Core/Config/ConfigEntityUnitTest.php b/core/tests/Drupal/KernelTests/Core/Config/ConfigEntityUnitTest.php
index 0010da7..5cccc33 100644
--- a/core/tests/Drupal/KernelTests/Core/Config/ConfigEntityUnitTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Config/ConfigEntityUnitTest.php
@@ -52,7 +52,7 @@ public function testStorageMethods() {
     $expected_id = 'test_id';
     $config_name = $entity_type->getConfigPrefix() . '.' . $expected_id;
     $storage = $this->storage;
-    $this->assertIdentical($storage::getIDFromConfigName($config_name, $entity_type->getConfigPrefix()), $expected_id);
+    $this->assertSame($expected_id, $storage::getIDFromConfigName($config_name, $entity_type->getConfigPrefix()));
 
     // Create three entities, two with the same style.
     $style = $this->randomMachineName(8);
@@ -80,7 +80,7 @@ public function testStorageMethods() {
     // Compare UUIDs as the objects are not identical since
     // $entity->enforceIsNew is FALSE and $entity_loaded_by_uuid->enforceIsNew
     // is NULL.
-    $this->assertIdentical($entity->uuid(), $entity_loaded_by_uuid->uuid());
+    $this->assertSame($entity->uuid(), $entity_loaded_by_uuid->uuid());
 
     $entities = $this->storage->loadByProperties();
     $this->assertEqual(count($entities), 3, 'Three entities are loaded when no properties are specified.');
@@ -90,7 +90,7 @@ public function testStorageMethods() {
 
     // Assert that both returned entities have a matching style property.
     foreach ($entities as $entity) {
-      $this->assertIdentical($entity->get('style'), $style, 'The loaded entity has the correct style value specified.');
+      $this->assertSame($style, $entity->get('style'), 'The loaded entity has the correct style value specified.');
     }
 
     // Test that schema type enforcement can be overridden by trusting the data.
@@ -100,12 +100,12 @@ public function testStorageMethods() {
       'style' => 999
     ]);
     $entity->save();
-    $this->assertIdentical('999', $entity->style);
+    $this->assertSame('999', $entity->style);
     $entity->style = 999;
     $entity->trustData()->save();
-    $this->assertIdentical(999, $entity->style);
+    $this->assertSame(999, $entity->style);
     $entity->save();
-    $this->assertIdentical('999', $entity->style);
+    $this->assertSame('999', $entity->style);
   }
 
 }
diff --git a/core/tests/Drupal/KernelTests/Core/Config/ConfigEventsTest.php b/core/tests/Drupal/KernelTests/Core/Config/ConfigEventsTest.php
index 74bb798..6854248 100644
--- a/core/tests/Drupal/KernelTests/Core/Config/ConfigEventsTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Config/ConfigEventsTest.php
@@ -28,28 +28,28 @@ public function testConfigEvents() {
 
     $config = new Config($name, \Drupal::service('config.storage'), \Drupal::service('event_dispatcher'), \Drupal::service('config.typed'));
     $config->set('key', 'initial');
-    $this->assertIdentical(\Drupal::state()->get('config_events_test.event', []), [], 'No events fired by creating a new configuration object');
+    $this->assertSame([], \Drupal::state()->get('config_events_test.event', []), 'No events fired by creating a new configuration object');
     $config->save();
 
     $event = \Drupal::state()->get('config_events_test.event', []);
-    $this->assertIdentical($event['event_name'], ConfigEvents::SAVE);
-    $this->assertIdentical($event['current_config_data'], ['key' => 'initial']);
-    $this->assertIdentical($event['raw_config_data'], ['key' => 'initial']);
-    $this->assertIdentical($event['original_config_data'], []);
+    $this->assertSame(ConfigEvents::SAVE, $event['event_name']);
+    $this->assertSame(['key' => 'initial'], $event['current_config_data']);
+    $this->assertSame(['key' => 'initial'], $event['raw_config_data']);
+    $this->assertSame([], $event['original_config_data']);
 
     $config->set('key', 'updated')->save();
     $event = \Drupal::state()->get('config_events_test.event', []);
-    $this->assertIdentical($event['event_name'], ConfigEvents::SAVE);
-    $this->assertIdentical($event['current_config_data'], ['key' => 'updated']);
-    $this->assertIdentical($event['raw_config_data'], ['key' => 'updated']);
-    $this->assertIdentical($event['original_config_data'], ['key' => 'initial']);
+    $this->assertSame(ConfigEvents::SAVE, $event['event_name']);
+    $this->assertSame(['key' => 'updated'], $event['current_config_data']);
+    $this->assertSame(['key' => 'updated'], $event['raw_config_data']);
+    $this->assertSame(['key' => 'initial'], $event['original_config_data']);
 
     $config->delete();
     $event = \Drupal::state()->get('config_events_test.event', []);
-    $this->assertIdentical($event['event_name'], ConfigEvents::DELETE);
-    $this->assertIdentical($event['current_config_data'], []);
-    $this->assertIdentical($event['raw_config_data'], []);
-    $this->assertIdentical($event['original_config_data'], ['key' => 'updated']);
+    $this->assertSame(ConfigEvents::DELETE, $event['event_name']);
+    $this->assertSame([], $event['current_config_data']);
+    $this->assertSame([], $event['raw_config_data']);
+    $this->assertSame(['key' => 'updated'], $event['original_config_data']);
   }
 
   /**
@@ -64,18 +64,18 @@ public function testConfigRenameEvent() {
     $config = $this->config($name);
     $config->set('key', 'initial')->save();
     $event = \Drupal::state()->get('config_events_test.event', []);
-    $this->assertIdentical($event['event_name'], ConfigEvents::SAVE);
-    $this->assertIdentical($event['current_config_data'], ['key' => 'initial']);
+    $this->assertSame(ConfigEvents::SAVE, $event['event_name']);
+    $this->assertSame(['key' => 'initial'], $event['current_config_data']);
 
     // Override applies when getting runtime config.
     $this->assertEqual($GLOBALS['config'][$name], \Drupal::config($name)->get());
 
     \Drupal::configFactory()->rename($name, $new_name);
     $event = \Drupal::state()->get('config_events_test.event', []);
-    $this->assertIdentical($event['event_name'], ConfigEvents::RENAME);
-    $this->assertIdentical($event['current_config_data'], ['key' => 'new overridden']);
-    $this->assertIdentical($event['raw_config_data'], ['key' => 'initial']);
-    $this->assertIdentical($event['original_config_data'], ['key' => 'new overridden']);
+    $this->assertSame(ConfigEvents::RENAME, $event['event_name']);
+    $this->assertSame(['key' => 'new overridden'], $event['current_config_data']);
+    $this->assertSame(['key' => 'initial'], $event['raw_config_data']);
+    $this->assertSame(['key' => 'new overridden'], $event['original_config_data']);
   }
 
 }
diff --git a/core/tests/Drupal/KernelTests/Core/Config/ConfigFileContentTest.php b/core/tests/Drupal/KernelTests/Core/Config/ConfigFileContentTest.php
index 5366629..9c61a61 100644
--- a/core/tests/Drupal/KernelTests/Core/Config/ConfigFileContentTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Config/ConfigFileContentTest.php
@@ -62,7 +62,7 @@ public function testReadWriteConfig() {
 
     // Verify nothing was saved.
     $data = $storage->read($name);
-    $this->assertIdentical($data, FALSE);
+    $this->assertSame(FALSE, $data);
 
     // Add a top level value.
     $config = $this->config($name);
@@ -122,7 +122,7 @@ public function testReadWriteConfig() {
     $this->assertTrue($config->get($true_key), "Boolean TRUE value returned the TRUE.");
 
     // Read null value.
-    $this->assertIdentical($config->get('null'), NULL);
+    $this->assertSame(NULL, $config->get('null'));
 
     // Read false that had been nested in an array value.
     $this->assertSame($config->get($casting_array_false_value_key), FALSE, "Nested boolean FALSE value returned FALSE.");
@@ -181,7 +181,7 @@ public function testReadWriteConfig() {
 
     // Verify the database entry no longer exists.
     $data = $storage->read($name);
-    $this->assertIdentical($data, FALSE);
+    $this->assertSame(FALSE, $data);
   }
 
   /**
@@ -210,22 +210,22 @@ public function testSerialization() {
     $config_parsed = $filestorage->read($name);
 
     $key = 'numeric keys';
-    $this->assertIdentical($config_data[$key], $config_parsed[$key]);
+    $this->assertSame($config_data[$key], $config_parsed[$key]);
 
     $key = 'nested keys';
-    $this->assertIdentical($config_data[$key], $config_parsed[$key]);
+    $this->assertSame($config_data[$key], $config_parsed[$key]);
 
     $key = 'HTML';
-    $this->assertIdentical($config_data['nested keys'][$key], $config_parsed['nested keys'][$key]);
+    $this->assertSame($config_data['nested keys'][$key], $config_parsed['nested keys'][$key]);
 
     $key = 'UTF-8';
-    $this->assertIdentical($config_data['nested keys'][$key], $config_parsed['nested keys'][$key]);
+    $this->assertSame($config_data['nested keys'][$key], $config_parsed['nested keys'][$key]);
 
     $key = 'ΑΒΓΔΕΖΗΘΙΚΛΜΝΞΟΣὨ';
-    $this->assertIdentical($config_data['nested keys'][$key], $config_parsed['nested keys'][$key]);
+    $this->assertSame($config_data['nested keys'][$key], $config_parsed['nested keys'][$key]);
 
     $key = 'invalid xml';
-    $this->assertIdentical($config_data[$key], $config_parsed[$key]);
+    $this->assertSame($config_data[$key], $config_parsed[$key]);
   }
 
 }
diff --git a/core/tests/Drupal/KernelTests/Core/Config/ConfigImportRecreateTest.php b/core/tests/Drupal/KernelTests/Core/Config/ConfigImportRecreateTest.php
index 0523ee8..c69f9fe 100644
--- a/core/tests/Drupal/KernelTests/Core/Config/ConfigImportRecreateTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Config/ConfigImportRecreateTest.php
@@ -92,7 +92,7 @@ public function testRecreateEntity() {
     $this->assertEqual(5, count($creates), 'There are 5 configuration items to create.');
     $this->assertEqual(5, count($deletes), 'There are 5 configuration items to delete.');
     $this->assertEqual(0, count($this->configImporter->getUnprocessedConfiguration('update')), 'There are no configuration items to update.');
-    $this->assertIdentical($creates, array_reverse($deletes), 'Deletes and creates contain the same configuration names in opposite orders due to dependencies.');
+    $this->assertSame($creates, array_reverse($deletes), 'Deletes and creates contain the same configuration names in opposite orders due to dependencies.');
 
     $this->configImporter->import();
 
diff --git a/core/tests/Drupal/KernelTests/Core/Config/ConfigImportRenameValidationTest.php b/core/tests/Drupal/KernelTests/Core/Config/ConfigImportRenameValidationTest.php
index e755d5f..cbb2e95 100644
--- a/core/tests/Drupal/KernelTests/Core/Config/ConfigImportRenameValidationTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Config/ConfigImportRenameValidationTest.php
@@ -95,7 +95,7 @@ public function testRenameValidation() {
       'node.type.' . $content_type->id() . '::config_test.dynamic.' . $test_entity_id,
     ];
     $renames = $this->configImporter->getUnprocessedConfiguration('rename');
-    $this->assertIdentical($expected, $renames);
+    $this->assertSame($expected, $renames);
 
     // Try to import the configuration. We expect an exception to be thrown
     // because the staged entity is of a different type.
@@ -138,7 +138,7 @@ public function testRenameSimpleConfigValidation() {
       'config_test.old::config_test.new'
     ];
     $renames = $this->configImporter->getUnprocessedConfiguration('rename');
-    $this->assertIdentical($expected, $renames);
+    $this->assertSame($expected, $renames);
 
     // Try to import the configuration. We expect an exception to be thrown
     // because the rename is for simple configuration.
diff --git a/core/tests/Drupal/KernelTests/Core/Config/ConfigImporterTest.php b/core/tests/Drupal/KernelTests/Core/Config/ConfigImporterTest.php
index 0ecc38c..36433fe 100644
--- a/core/tests/Drupal/KernelTests/Core/Config/ConfigImporterTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Config/ConfigImporterTest.php
@@ -68,7 +68,7 @@ public function testNoImport() {
 
     // Verify the default configuration values exist.
     $config = $this->config($dynamic_name);
-    $this->assertIdentical($config->get('id'), 'dotted.default');
+    $this->assertSame('dotted.default', $config->get('id'));
 
     // Verify that a bare $this->config() does not involve module APIs.
     $this->assertFalse(isset($GLOBALS['hook_config_test']));
@@ -121,7 +121,7 @@ public function testDeleted() {
 
     // Verify the default configuration values exist.
     $config = $this->config($dynamic_name);
-    $this->assertIdentical($config->get('id'), 'dotted.default');
+    $this->assertSame('dotted.default', $config->get('id'));
 
     // Delete the file from the sync directory.
     $sync->delete($dynamic_name);
@@ -130,10 +130,10 @@ public function testDeleted() {
     $this->configImporter->reset()->import();
 
     // Verify the file has been removed.
-    $this->assertIdentical($storage->read($dynamic_name), FALSE);
+    $this->assertSame(FALSE, $storage->read($dynamic_name));
 
     $config = $this->config($dynamic_name);
-    $this->assertIdentical($config->get('id'), NULL);
+    $this->assertSame(NULL, $config->get('id'));
 
     // Verify that appropriate module API hooks have been invoked.
     $this->assertTrue(isset($GLOBALS['hook_config_test']['load']));
@@ -157,7 +157,7 @@ public function testNew() {
     $sync = $this->container->get('config.storage.sync');
 
     // Verify the configuration to create does not exist yet.
-    $this->assertIdentical($storage->exists($dynamic_name), FALSE, $dynamic_name . ' not found.');
+    $this->assertSame(FALSE, $storage->exists($dynamic_name), $dynamic_name . ' not found.');
 
     // Create new config entity.
     $original_dynamic_data = [
@@ -175,14 +175,14 @@ public function testNew() {
     ];
     $sync->write($dynamic_name, $original_dynamic_data);
 
-    $this->assertIdentical($sync->exists($dynamic_name), TRUE, $dynamic_name . ' found.');
+    $this->assertSame(TRUE, $sync->exists($dynamic_name), $dynamic_name . ' found.');
 
     // Import.
     $this->configImporter->reset()->import();
 
     // Verify the values appeared.
     $config = $this->config($dynamic_name);
-    $this->assertIdentical($config->get('label'), $original_dynamic_data['label']);
+    $this->assertSame($original_dynamic_data['label'], $config->get('label'));
 
     // Verify that appropriate module API hooks have been invoked.
     $this->assertFalse(isset($GLOBALS['hook_config_test']['load']));
@@ -351,7 +351,7 @@ public function testSecondaryUpdateDeletedDeleterFirst() {
       $name_deletee,
       $name_other,
     ];
-    $this->assertIdentical($expected, $updates);
+    $this->assertSame($expected, $updates);
 
     // Import.
     $this->configImporter->import();
@@ -478,8 +478,8 @@ public function testUpdated() {
     $sync = $this->container->get('config.storage.sync');
 
     // Verify that the configuration objects to import exist.
-    $this->assertIdentical($storage->exists($name), TRUE, $name . ' found.');
-    $this->assertIdentical($storage->exists($dynamic_name), TRUE, $dynamic_name . ' found.');
+    $this->assertSame(TRUE, $storage->exists($name), $name . ' found.');
+    $this->assertSame(TRUE, $storage->exists($dynamic_name), $dynamic_name . ' found.');
 
     // Replace the file content of the existing configuration objects in the
     // sync directory.
@@ -493,9 +493,9 @@ public function testUpdated() {
 
     // Verify the active configuration still returns the default values.
     $config = $this->config($name);
-    $this->assertIdentical($config->get('foo'), 'bar');
+    $this->assertSame('bar', $config->get('foo'));
     $config = $this->config($dynamic_name);
-    $this->assertIdentical($config->get('label'), 'Default');
+    $this->assertSame('Default', $config->get('label'));
 
     // Import.
     $this->configImporter->reset()->import();
@@ -503,13 +503,13 @@ public function testUpdated() {
     // Verify the values were updated.
     \Drupal::configFactory()->reset($name);
     $config = $this->config($name);
-    $this->assertIdentical($config->get('foo'), 'beer');
+    $this->assertSame('beer', $config->get('foo'));
     $config = $this->config($dynamic_name);
-    $this->assertIdentical($config->get('label'), 'Updated');
+    $this->assertSame('Updated', $config->get('label'));
 
     // Verify that the original file content is still the same.
-    $this->assertIdentical($sync->read($name), $original_name_data);
-    $this->assertIdentical($sync->read($dynamic_name), $original_dynamic_data);
+    $this->assertSame($original_name_data, $sync->read($name));
+    $this->assertSame($original_dynamic_data, $sync->read($dynamic_name));
 
     // Verify that appropriate module API hooks have been invoked.
     $this->assertTrue(isset($GLOBALS['hook_config_test']['load']));
diff --git a/core/tests/Drupal/KernelTests/Core/Config/ConfigInstallTest.php b/core/tests/Drupal/KernelTests/Core/Config/ConfigInstallTest.php
index 8ba0ae1..5c71b21 100644
--- a/core/tests/Drupal/KernelTests/Core/Config/ConfigInstallTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Config/ConfigInstallTest.php
@@ -40,9 +40,9 @@ public function testModuleInstallation() {
 
     // Verify that default module config does not exist before installation yet.
     $config = $this->config($default_config);
-    $this->assertIdentical($config->isNew(), TRUE);
+    $this->assertSame(TRUE, $config->isNew());
     $config = $this->config($default_configuration_entity);
-    $this->assertIdentical($config->isNew(), TRUE);
+    $this->assertSame(TRUE, $config->isNew());
 
     // Ensure that schema provided by modules that are not installed is not
     // available.
@@ -55,9 +55,9 @@ public function testModuleInstallation() {
     \Drupal::configFactory()->reset($default_config);
     \Drupal::configFactory()->reset($default_configuration_entity);
     $config = $this->config($default_config);
-    $this->assertIdentical($config->isNew(), FALSE);
+    $this->assertSame(FALSE, $config->isNew());
     $config = $this->config($default_configuration_entity);
-    $this->assertIdentical($config->isNew(), FALSE);
+    $this->assertSame(FALSE, $config->isNew());
 
     // Verify that config_test API hooks were invoked for the dynamic default
     // configuration entity.
@@ -146,7 +146,7 @@ public function testCollectionInstallationCollections() {
     $this->assertEqual($collections, $active_storage->getAllCollectionNames());
     $collection_storage = $active_storage->createCollection('entity');
     $data = $collection_storage->read('config_test.dynamic.dotted.default');
-    $this->assertIdentical(['label' => 'entity'], $data);
+    $this->assertSame(['label' => 'entity'], $data);
 
     // Test that the config manager uninstalls configuration from collections
     // as expected.
@@ -185,7 +185,7 @@ public function testCollectionInstallationCollectionConfigEntity() {
     $data = $active_storage->read($name);
     $this->assertTrue(isset($data['uuid']));
     $data = $collection_storage->read($name);
-    $this->assertIdentical(['label' => 'entity'], $data);
+    $this->assertSame(['label' => 'entity'], $data);
   }
 
   /**
@@ -227,7 +227,7 @@ public function testDependencyChecking() {
     $this->assertTrue($entity, 'The config_test.dynamic.other_module_test_with_dependency configuration has been created during install.');
     // Ensure that dependencies can be added during module installation by
     // hooks.
-    $this->assertIdentical('config_install_dependency_test', $entity->getDependencies()['module'][0]);
+    $this->assertSame('config_install_dependency_test', $entity->getDependencies()['module'][0]);
   }
 
   /**
diff --git a/core/tests/Drupal/KernelTests/Core/Config/ConfigLanguageOverrideTest.php b/core/tests/Drupal/KernelTests/Core/Config/ConfigLanguageOverrideTest.php
index 5bf6f0e..a1fb7bc 100644
--- a/core/tests/Drupal/KernelTests/Core/Config/ConfigLanguageOverrideTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Config/ConfigLanguageOverrideTest.php
@@ -36,22 +36,22 @@ public function testConfigLanguageOverride() {
     // English overrides work.
     \Drupal::languageManager()->setConfigOverrideLanguage(\Drupal::languageManager()->getLanguage('en'));
     $config = \Drupal::config('config_test.system');
-    $this->assertIdentical($config->get('foo'), 'en bar');
+    $this->assertSame('en bar', $config->get('foo'));
 
     // Ensure that the raw data is not translated.
     $raw = $config->getRawData();
-    $this->assertIdentical($raw['foo'], 'bar');
+    $this->assertSame('bar', $raw['foo']);
 
     ConfigurableLanguage::createFromLangcode('fr')->save();
     ConfigurableLanguage::createFromLangcode('de')->save();
 
     \Drupal::languageManager()->setConfigOverrideLanguage(\Drupal::languageManager()->getLanguage('fr'));
     $config = \Drupal::config('config_test.system');
-    $this->assertIdentical($config->get('foo'), 'fr bar');
+    $this->assertSame('fr bar', $config->get('foo'));
 
     \Drupal::languageManager()->setConfigOverrideLanguage(\Drupal::languageManager()->getLanguage('de'));
     $config = \Drupal::config('config_test.system');
-    $this->assertIdentical($config->get('foo'), 'de bar');
+    $this->assertSame('de bar', $config->get('foo'));
 
     // Test overrides of completely new configuration objects. In normal runtime
     // this should only happen for configuration entities as we should not be
@@ -62,8 +62,8 @@ public function testConfigLanguageOverride() {
       ->save();
     $config = \Drupal::config('config_test.new');
     $this->assertTrue($config->isNew(), 'The configuration object config_test.new is new');
-    $this->assertIdentical($config->get('language'), 'override');
-    $this->assertIdentical($config->getOriginal('language', FALSE), NULL);
+    $this->assertSame('override', $config->get('language'));
+    $this->assertSame(NULL, $config->getOriginal('language', FALSE));
 
     // Test how overrides react to base configuration changes. Set up some base
     // values.
@@ -82,7 +82,7 @@ public function testConfigLanguageOverride() {
       ->save();
     \Drupal::configFactory()->clearStaticCache();
     $config = \Drupal::config('config_test.foo');
-    $this->assertIdentical($config->get('value'), ['key' => 'override']);
+    $this->assertSame(['key' => 'override'], $config->get('value'));
 
     // Ensure renaming the config will rename the override.
     \Drupal::languageManager()->setConfigOverrideLanguage(\Drupal::languageManager()->getLanguage('en'));
diff --git a/core/tests/Drupal/KernelTests/Core/Config/ConfigModuleOverridesTest.php b/core/tests/Drupal/KernelTests/Core/Config/ConfigModuleOverridesTest.php
index a94123d..2de7c3d 100644
--- a/core/tests/Drupal/KernelTests/Core/Config/ConfigModuleOverridesTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Config/ConfigModuleOverridesTest.php
@@ -42,8 +42,8 @@ public function testSimpleModuleOverrides() {
     // creating simple configuration objects on the fly.
     $config = $config_factory->get('config_override_test.new');
     $this->assertTrue($config->isNew(), 'The configuration object config_override_test.new is new');
-    $this->assertIdentical($config->get('module'), 'override');
-    $this->assertIdentical($config->getOriginal('module', FALSE), NULL);
+    $this->assertSame('override', $config->get('module'));
+    $this->assertSame(NULL, $config->getOriginal('module', FALSE));
 
     unset($GLOBALS['config_test_run_module_overrides']);
   }
diff --git a/core/tests/Drupal/KernelTests/Core/Config/ConfigOverrideTest.php b/core/tests/Drupal/KernelTests/Core/Config/ConfigOverrideTest.php
index b2ddaa3..3b0988f 100644
--- a/core/tests/Drupal/KernelTests/Core/Config/ConfigOverrideTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Config/ConfigOverrideTest.php
@@ -46,25 +46,25 @@ public function testConfOverride() {
     // directly otherwise overrides will apply.
     $active = $this->container->get('config.storage');
     $data = $active->read('config_test.system');
-    $this->assertIdentical($data['foo'], $expected_original_data['foo']);
+    $this->assertSame($expected_original_data['foo'], $data['foo']);
     $this->assertFalse(isset($data['baz']));
-    $this->assertIdentical($data['404'], $expected_original_data['404']);
+    $this->assertSame($expected_original_data['404'], $data['404']);
 
     // Get the configuration object with overrides.
     $config = \Drupal::configFactory()->get('config_test.system');
 
     // Verify that it contains the overridden data from $config.
-    $this->assertIdentical($config->get('foo'), $overrides['config_test.system']['foo']);
-    $this->assertIdentical($config->get('baz'), $overrides['config_test.system']['baz']);
-    $this->assertIdentical($config->get('404'), $overrides['config_test.system']['404']);
+    $this->assertSame($overrides['config_test.system']['foo'], $config->get('foo'));
+    $this->assertSame($overrides['config_test.system']['baz'], $config->get('baz'));
+    $this->assertSame($overrides['config_test.system']['404'], $config->get('404'));
 
     // Get the configuration object which does not have overrides.
     $config = \Drupal::configFactory()->getEditable('config_test.system');
 
     // Verify that it does not contains the overridden data from $config.
-    $this->assertIdentical($config->get('foo'), $expected_original_data['foo']);
-    $this->assertIdentical($config->get('baz'), NULL);
-    $this->assertIdentical($config->get('404'), $expected_original_data['404']);
+    $this->assertSame($expected_original_data['foo'], $config->get('foo'));
+    $this->assertSame(NULL, $config->get('baz'));
+    $this->assertSame($expected_original_data['404'], $config->get('404'));
 
     // Set the value for 'baz' (on the original data).
     $expected_original_data['baz'] = 'original baz';
@@ -79,14 +79,14 @@ public function testConfOverride() {
 
     // Reload it and verify that it still contains overridden data from $config.
     $config = \Drupal::config('config_test.system');
-    $this->assertIdentical($config->get('foo'), $overrides['config_test.system']['foo']);
-    $this->assertIdentical($config->get('baz'), $overrides['config_test.system']['baz']);
-    $this->assertIdentical($config->get('404'), $overrides['config_test.system']['404']);
+    $this->assertSame($overrides['config_test.system']['foo'], $config->get('foo'));
+    $this->assertSame($overrides['config_test.system']['baz'], $config->get('baz'));
+    $this->assertSame($overrides['config_test.system']['404'], $config->get('404'));
 
     // Verify that raw config data has changed.
-    $this->assertIdentical($config->getOriginal('foo', FALSE), $expected_original_data['foo']);
-    $this->assertIdentical($config->getOriginal('baz', FALSE), $expected_original_data['baz']);
-    $this->assertIdentical($config->getOriginal('404', FALSE), $expected_original_data['404']);
+    $this->assertSame($expected_original_data['foo'], config->getOriginal('foo', FALSE));
+    $this->assertSame($expected_original_data['baz'], config->getOriginal('baz', FALSE));
+    $this->assertSame($expected_original_data['404'], config->getOriginal('404', FALSE));
 
     // Write file to sync.
     $sync = $this->container->get('config.storage.sync');
@@ -102,15 +102,15 @@ public function testConfOverride() {
 
     // Verify that the new configuration data exists. Have to read storage
     // directly otherwise overrides will apply.
-    $this->assertIdentical($data['foo'], $expected_new_data['foo']);
+    $this->assertSame($expected_new_data['foo'], $data['foo']);
     $this->assertFalse(isset($data['baz']));
-    $this->assertIdentical($data['404'], $expected_new_data['404']);
+    $this->assertSame($expected_new_data['404'], $data['404']);
 
     // Verify that the overrides are still working.
     $config = \Drupal::config('config_test.system');
-    $this->assertIdentical($config->get('foo'), $overrides['config_test.system']['foo']);
-    $this->assertIdentical($config->get('baz'), $overrides['config_test.system']['baz']);
-    $this->assertIdentical($config->get('404'), $overrides['config_test.system']['404']);
+    $this->assertSame($overrides['config_test.system']['foo'], $config->get('foo'));
+    $this->assertSame($overrides['config_test.system']['baz'], $config->get('baz'));
+    $this->assertSame($overrides['config_test.system']['404'], $config->get('404'));
 
     // Test overrides of completely new configuration objects. In normal runtime
     // this should only happen for configuration entities as we should not be
@@ -118,9 +118,9 @@ public function testConfOverride() {
     $GLOBALS['config']['config_test.new']['key'] = 'override';
     $config = \Drupal::config('config_test.new');
     $this->assertTrue($config->isNew(), 'The configuration object config_test.new is new');
-    $this->assertIdentical($config->get('key'), 'override');
+    $this->assertSame('override', $config->get('key'));
     $config_raw = \Drupal::configFactory()->getEditable('config_test.new');
-    $this->assertIdentical($config_raw->get('key'), NULL);
+    $this->assertSame(NULL, $config_raw->get('key'));
     $config_raw
       ->set('key', 'raw')
       ->set('new_key', 'new_value')
@@ -129,10 +129,10 @@ public function testConfOverride() {
     // accordingly.
     $config = \Drupal::config('config_test.new');
     $this->assertFalse($config->isNew(), 'The configuration object config_test.new is not new');
-    $this->assertIdentical($config->get('key'), 'override');
-    $this->assertIdentical($config->get('new_key'), 'new_value');
+    $this->assertSame('override', $config->get('key'));
+    $this->assertSame('new_value', $config->get('new_key'));
     $raw_data = $config->getRawData();
-    $this->assertIdentical($raw_data['key'], 'raw');
+    $this->assertSame('raw', $raw_data['key']);
   }
 
 }
diff --git a/core/tests/Drupal/KernelTests/Core/Config/ConfigSchemaTest.php b/core/tests/Drupal/KernelTests/Core/Config/ConfigSchemaTest.php
index e2e02e1..4351497 100644
--- a/core/tests/Drupal/KernelTests/Core/Config/ConfigSchemaTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Config/ConfigSchemaTest.php
@@ -40,7 +40,7 @@ protected function setUp() {
    */
   public function testSchemaMapping() {
     // Nonexistent configuration key will have Undefined as metadata.
-    $this->assertIdentical(FALSE, \Drupal::service('config.typed')->hasConfigSchema('config_schema_test.no_such_key'));
+    $this->assertSame(FALSE, \Drupal::service('config.typed')->hasConfigSchema('config_schema_test.no_such_key'));
     $definition = \Drupal::service('config.typed')->getDefinition('config_schema_test.no_such_key');
     $expected = [];
     $expected['label'] = 'Undefined';
@@ -51,12 +51,12 @@ public function testSchemaMapping() {
     $this->assertEqual($definition, $expected, 'Retrieved the right metadata for nonexistent configuration.');
 
     // Configuration file without schema will return Undefined as well.
-    $this->assertIdentical(FALSE, \Drupal::service('config.typed')->hasConfigSchema('config_schema_test.noschema'));
+    $this->assertSame(FALSE, \Drupal::service('config.typed')->hasConfigSchema('config_schema_test.noschema'));
     $definition = \Drupal::service('config.typed')->getDefinition('config_schema_test.noschema');
     $this->assertEqual($definition, $expected, 'Retrieved the right metadata for configuration with no schema.');
 
     // Configuration file with only some schema.
-    $this->assertIdentical(TRUE, \Drupal::service('config.typed')->hasConfigSchema('config_schema_test.someschema'));
+    $this->assertSame(TRUE, \Drupal::service('config.typed')->hasConfigSchema('config_schema_test.someschema'));
     $definition = \Drupal::service('config.typed')->getDefinition('config_schema_test.someschema');
     $expected = [];
     $expected['label'] = 'Schema test data';
@@ -391,13 +391,13 @@ public function testConfigSaveWithSchema() {
     $this->config('config_schema_test.schema_data_types')
       ->setData($untyped_to_typed)
       ->save();
-    $this->assertIdentical($this->config('config_schema_test.schema_data_types')->get(), $typed_values);
+    $this->assertSame($typed_values, $this->config('config_schema_test.schema_data_types')->get());
 
     // Save config which does not have a schema that enforces types.
     $this->config('config_schema_test.no_schema_data_types')
       ->setData($untyped_values)
       ->save();
-    $this->assertIdentical($this->config('config_schema_test.no_schema_data_types')->get(), $untyped_values);
+    $this->assertSame($untyped_values, $this->config('config_schema_test.no_schema_data_types')->get());
 
     // Ensure that configuration objects with keys marked as ignored are not
     // changed when saved. The 'config_schema_test.ignore' will have been saved
@@ -407,7 +407,7 @@ public function testConfigSaveWithSchema() {
     $original_data = $install_storage->read('config_schema_test.ignore');
     $installed_data = $this->config('config_schema_test.ignore')->get();
     unset($installed_data['_core']);
-    $this->assertIdentical($installed_data, $original_data);
+    $this->assertSame($original_data, $installed_data);
   }
 
   /**
@@ -505,7 +505,7 @@ public function testSchemaFallback() {
     $definition2 = \Drupal::service('config.typed')->getDefinition('config_schema_test.wildcard_fallback.something.something');
     // This should be the schema of config_schema_test.wildcard_fallback.* as
     //well.
-    $this->assertIdentical($definition, $definition2);
+    $this->assertSame($definition, $definition2);
   }
 
   /**
@@ -619,8 +619,8 @@ public function testConfigSaveWithWrappingSchema() {
     \Drupal::configFactory()->getEditable('wrapping.config_schema_test.plugin_types')
       ->setData($untyped_values)
       ->save();
-    $this->assertIdentical(\Drupal::config('wrapping.config_schema_test.plugin_types')
-      ->get(), $typed_values);
+    $this->assertSame($typed_values, \Drupal::config('wrapping.config_schema_test.plugin_types')
+      ->get());
   }
 
   /**
@@ -655,8 +655,8 @@ public function testConfigSaveWithWrappingSchemaDoubleBrackets() {
     \Drupal::configFactory()->getEditable('wrapping.config_schema_test.double_brackets')
       ->setData($untyped_values)
       ->save();
-    $this->assertIdentical(\Drupal::config('wrapping.config_schema_test.double_brackets')
-      ->get(), $typed_values);
+    $this->assertSame($typed_values, \Drupal::config('wrapping.config_schema_test.double_brackets')
+      ->get());
 
     $tests = \Drupal::service('config.typed')->get('wrapping.config_schema_test.double_brackets')->get('tests')->getElements();
     $definition = $tests[0]->getDataDefinition()->toArray();
@@ -689,8 +689,8 @@ public function testConfigSaveWithWrappingSchemaDoubleBrackets() {
     \Drupal::configFactory()->getEditable('wrapping.config_schema_test.double_brackets')
       ->setData($untyped_values)
       ->save();
-    $this->assertIdentical(\Drupal::config('wrapping.config_schema_test.double_brackets')
-      ->get(), $typed_values);
+    $this->assertSame($typed_values, \Drupal::config('wrapping.config_schema_test.double_brackets')
+      ->get());
 
     $tests = \Drupal::service('config.typed')->get('wrapping.config_schema_test.double_brackets')->get('tests')->getElements();
     $definition = $tests[0]->getDataDefinition()->toArray();
diff --git a/core/tests/Drupal/KernelTests/Core/Config/ConfigSnapshotTest.php b/core/tests/Drupal/KernelTests/Core/Config/ConfigSnapshotTest.php
index 62eff04..5730628 100644
--- a/core/tests/Drupal/KernelTests/Core/Config/ConfigSnapshotTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Config/ConfigSnapshotTest.php
@@ -76,7 +76,7 @@ public function testSnapshot() {
 
     // Verify changed config was properly imported.
     \Drupal::configFactory()->reset($config_name);
-    $this->assertIdentical($this->config($config_name)->get($config_key), $new_data);
+    $this->assertSame($new_data, $this->config($config_name)->get($config_key));
 
     // Verify that a new snapshot was created which and that it matches
     // the active config.
diff --git a/core/tests/Drupal/KernelTests/Core/Config/SchemaCheckTraitTest.php b/core/tests/Drupal/KernelTests/Core/Config/SchemaCheckTraitTest.php
index 68a8962..65eae84 100644
--- a/core/tests/Drupal/KernelTests/Core/Config/SchemaCheckTraitTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Config/SchemaCheckTraitTest.php
@@ -44,12 +44,12 @@ protected function setUp() {
   public function testTrait() {
     // Test a non existing schema.
     $ret = $this->checkConfigSchema($this->typedConfig, 'config_schema_test.noschema', $this->config('config_schema_test.noschema')->get());
-    $this->assertIdentical($ret, FALSE);
+    $this->assertSame(FALSE, $ret);
 
     // Test an existing schema with valid data.
     $config_data = $this->config('config_test.types')->get();
     $ret = $this->checkConfigSchema($this->typedConfig, 'config_test.types', $config_data);
-    $this->assertIdentical($ret, TRUE);
+    $this->assertSame(TRUE, $ret);
 
     // Add a new key, a new array and overwrite boolean with array to test the
     // error messages.
diff --git a/core/tests/Drupal/KernelTests/Core/Config/Storage/ConfigStorageTestBase.php b/core/tests/Drupal/KernelTests/Core/Config/Storage/ConfigStorageTestBase.php
index 54d0164..8cce27a 100644
--- a/core/tests/Drupal/KernelTests/Core/Config/Storage/ConfigStorageTestBase.php
+++ b/core/tests/Drupal/KernelTests/Core/Config/Storage/ConfigStorageTestBase.php
@@ -37,26 +37,26 @@ public function testCRUD() {
     $name = 'config_test.storage';
 
     // Checking whether a non-existing name exists returns FALSE.
-    $this->assertIdentical($this->storage->exists($name), FALSE);
+    $this->assertSame(FALSE, $this->storage->exists($name));
 
     // Reading a non-existing name returns FALSE.
     $data = $this->storage->read($name);
-    $this->assertIdentical($data, FALSE);
+    $this->assertSame(FALSE, $data);
 
     // Writing data returns TRUE and the data has been written.
     $data = ['foo' => 'bar'];
     $result = $this->storage->write($name, $data);
-    $this->assertIdentical($result, TRUE);
+    $this->assertSame(TRUE, $result);
 
     $raw_data = $this->read($name);
-    $this->assertIdentical($raw_data, $data);
+    $this->assertSame($data, $raw_data);
 
     // Checking whether an existing name exists returns TRUE.
-    $this->assertIdentical($this->storage->exists($name), TRUE);
+    $this->assertSame(TRUE, $this->storage->exists($name));
 
     // Writing the identical data again still returns TRUE.
     $result = $this->storage->write($name, $data);
-    $this->assertIdentical($result, TRUE);
+    $this->assertSame(TRUE, $result);
 
     // Listing all names returns all.
     $names = $this->storage->listAll();
@@ -72,17 +72,17 @@ public function testCRUD() {
     $new_name = 'config_test.storage_rename';
     $this->storage->rename($name, $new_name);
     $raw_data = $this->read($new_name);
-    $this->assertIdentical($raw_data, $data);
+    $this->assertSame($data, $raw_data);
     // Rename it back so further tests work.
     $this->storage->rename($new_name, $name);
 
     // Deleting an existing name returns TRUE.
     $result = $this->storage->delete($name);
-    $this->assertIdentical($result, TRUE);
+    $this->assertSame(TRUE, $result);
 
     // Deleting a non-existing name returns FALSE.
     $result = $this->storage->delete($name);
-    $this->assertIdentical($result, FALSE);
+    $this->assertSame(FALSE, $result);
 
     // Deleting all names with prefix deletes the appropriate data and returns
     // TRUE.
@@ -97,8 +97,8 @@ public function testCRUD() {
 
     $result = $this->storage->deleteAll('config_test.');
     $names = $this->storage->listAll('config_test.');
-    $this->assertIdentical($result, TRUE);
-    $this->assertIdentical($names, []);
+    $this->assertSame(TRUE, $result);
+    $this->assertSame([], $names);
 
     // Test renaming an object that does not exist throws an exception.
     try {
@@ -129,14 +129,14 @@ public function testInvalidStorage() {
     // pollute one another.
     $data = ['foo' => 'bar'];
     $result = $this->storage->write($name, $data);
-    $this->assertIdentical($result, TRUE);
+    $this->assertSame(TRUE, $result);
 
     $raw_data = $this->read($name);
-    $this->assertIdentical($raw_data, $data);
+    $this->assertSame($data, $raw_data);
 
     // Reading from a non-existing storage bin returns FALSE.
     $result = $this->invalidStorage->read($name);
-    $this->assertIdentical($result, FALSE);
+    $this->assertSame(FALSE, $result);
 
     // Deleting from a non-existing storage bin throws an exception.
     try {
@@ -150,11 +150,11 @@ public function testInvalidStorage() {
 
     // Listing on a non-existing storage bin returns an empty array.
     $result = $this->invalidStorage->listAll();
-    $this->assertIdentical($result, []);
+    $this->assertSame([], $result);
     // Writing to a non-existing storage bin creates the bin.
     $this->invalidStorage->write($name, ['foo' => 'bar']);
     $result = $this->invalidStorage->read($name);
-    $this->assertIdentical($result, ['foo' => 'bar']);
+    $this->assertSame(['foo' => 'bar'], $result);
   }
 
   /**
@@ -175,10 +175,10 @@ public function testDataTypes() {
     ];
 
     $result = $this->storage->write($name, $data);
-    $this->assertIdentical($result, TRUE);
+    $this->assertSame(TRUE, $result);
 
     $read_data = $this->storage->read($name);
-    $this->assertIdentical($read_data, $data);
+    $this->assertSame($data, $read_data);
   }
 
   /**
@@ -188,49 +188,49 @@ public function testCollection() {
     $name = 'config_test.storage';
     $data = ['foo' => 'bar'];
     $result = $this->storage->write($name, $data);
-    $this->assertIdentical($result, TRUE);
-    $this->assertIdentical($data, $this->storage->read($name));
+    $this->assertSame(TRUE, $result);
+    $this->assertSame($data, $this->storage->read($name));
 
     // Create configuration in a new collection.
     $new_storage = $this->storage->createCollection('collection.sub.new');
     $this->assertFalse($new_storage->exists($name));
     $this->assertEqual([], $new_storage->listAll());
     $new_storage->write($name, $data);
-    $this->assertIdentical($result, TRUE);
-    $this->assertIdentical($data, $new_storage->read($name));
+    $this->assertSame(TRUE, $result);
+    $this->assertSame($data, $new_storage->read($name));
     $this->assertEqual([$name], $new_storage->listAll());
     $this->assertTrue($new_storage->exists($name));
     $new_data = ['foo' => 'baz'];
     $new_storage->write($name, $new_data);
-    $this->assertIdentical($result, TRUE);
-    $this->assertIdentical($new_data, $new_storage->read($name));
+    $this->assertSame(TRUE, $result);
+    $this->assertSame($new_data, $new_storage->read($name));
 
     // Create configuration in another collection.
     $another_storage = $this->storage->createCollection('collection.sub.another');
     $this->assertFalse($another_storage->exists($name));
     $this->assertEqual([], $another_storage->listAll());
     $another_storage->write($name, $new_data);
-    $this->assertIdentical($result, TRUE);
-    $this->assertIdentical($new_data, $another_storage->read($name));
+    $this->assertSame(TRUE, $result);
+    $this->assertSame($new_data, $another_storage->read($name));
     $this->assertEqual([$name], $another_storage->listAll());
     $this->assertTrue($another_storage->exists($name));
 
     // Create configuration in yet another collection.
     $alt_storage = $this->storage->createCollection('alternate');
     $alt_storage->write($name, $new_data);
-    $this->assertIdentical($result, TRUE);
-    $this->assertIdentical($new_data, $alt_storage->read($name));
+    $this->assertSame(TRUE, $result);
+    $this->assertSame($new_data, $alt_storage->read($name));
 
     // Switch back to the collection-less mode and check the data still exists
     // add has not been touched.
-    $this->assertIdentical($data, $this->storage->read($name));
+    $this->assertSame($data, $this->storage->read($name));
 
     // Check that the getAllCollectionNames() method works.
-    $this->assertIdentical(['alternate', 'collection.sub.another', 'collection.sub.new'], $this->storage->getAllCollectionNames());
+    $this->assertSame(['alternate', 'collection.sub.another', 'collection.sub.new'], $this->storage->getAllCollectionNames());
 
     // Check that the collections are removed when they are empty.
     $alt_storage->delete($name);
-    $this->assertIdentical(['collection.sub.another', 'collection.sub.new'], $this->storage->getAllCollectionNames());
+    $this->assertSame(['collection.sub.another', 'collection.sub.new'], $this->storage->getAllCollectionNames());
 
     // Create configuration in collection called 'collection'. This ensures that
     // FileStorage's collection storage works regardless of its use of
@@ -239,20 +239,20 @@ public function testCollection() {
     $this->assertFalse($parent_storage->exists($name));
     $this->assertEqual([], $parent_storage->listAll());
     $parent_storage->write($name, $new_data);
-    $this->assertIdentical($result, TRUE);
-    $this->assertIdentical($new_data, $parent_storage->read($name));
+    $this->assertSame(TRUE, $result);
+    $this->assertSame($new_data, $parent_storage->read($name));
     $this->assertEqual([$name], $parent_storage->listAll());
     $this->assertTrue($parent_storage->exists($name));
-    $this->assertIdentical(['collection', 'collection.sub.another', 'collection.sub.new'], $this->storage->getAllCollectionNames());
+    $this->assertSame(['collection', 'collection.sub.another', 'collection.sub.new'], $this->storage->getAllCollectionNames());
     $parent_storage->deleteAll();
-    $this->assertIdentical(['collection.sub.another', 'collection.sub.new'], $this->storage->getAllCollectionNames());
+    $this->assertSame(['collection.sub.another', 'collection.sub.new'], $this->storage->getAllCollectionNames());
 
     // Check that the having an empty collection-less storage does not break
     // anything. Before deleting check that the previous delete did not affect
     // data in another collection.
-    $this->assertIdentical($data, $this->storage->read($name));
+    $this->assertSame($data, $this->storage->read($name));
     $this->storage->delete($name);
-    $this->assertIdentical(['collection.sub.another', 'collection.sub.new'], $this->storage->getAllCollectionNames());
+    $this->assertSame(['collection.sub.another', 'collection.sub.new'], $this->storage->getAllCollectionNames());
   }
 
   abstract protected function read($name);
diff --git a/core/tests/Drupal/KernelTests/Core/Config/Storage/FileStorageTest.php b/core/tests/Drupal/KernelTests/Core/Config/Storage/FileStorageTest.php
index 23bd5ea..e96bae4 100644
--- a/core/tests/Drupal/KernelTests/Core/Config/Storage/FileStorageTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Config/Storage/FileStorageTest.php
@@ -63,13 +63,13 @@ public function testlistAll() {
     ];
 
     $config_files = $this->storage->listAll();
-    $this->assertIdentical($config_files, $expected_files, 'Relative path, two config files found.');
+    $this->assertSame($expected_files, $config_files, 'Relative path, two config files found.');
 
     // @todo https://www.drupal.org/node/2666954 FileStorage::listAll() is
     //   case-sensitive. However, \Drupal\Core\Config\DatabaseStorage::listAll()
     //   is case-insensitive.
-    $this->assertIdentical(['system.performance'], $this->storage->listAll('system'), 'The FileStorage::listAll() with prefix works.');
-    $this->assertIdentical([], $this->storage->listAll('System'), 'The FileStorage::listAll() is case sensitive.');
+    $this->assertSame(['system.performance'], $this->storage->listAll('system'), 'The FileStorage::listAll() with prefix works.');
+    $this->assertSame([], $this->storage->listAll('System'), 'The FileStorage::listAll() is case sensitive.');
   }
 
   /**
diff --git a/core/tests/Drupal/KernelTests/Core/Database/BasicSyntaxTest.php b/core/tests/Drupal/KernelTests/Core/Database/BasicSyntaxTest.php
index 53a87b7..68fb458 100644
--- a/core/tests/Drupal/KernelTests/Core/Database/BasicSyntaxTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Database/BasicSyntaxTest.php
@@ -23,7 +23,7 @@ public function testConcatLiterals() {
       ':a4' => ' a ',
       ':a5' => 'test.',
     ]);
-    $this->assertIdentical($result->fetchField(), 'This is a test.', 'Basic CONCAT works.');
+    $this->assertSame('This is a test.', $result->fetchField(), 'Basic CONCAT works.');
   }
 
   /**
@@ -36,7 +36,7 @@ public function testConcatFields() {
       ':a3' => '.',
       ':age' => 25,
     ]);
-    $this->assertIdentical($result->fetchField(), 'The age of John is 25.', 'Field CONCAT works.');
+    $this->assertSame('The age of John is 25.', $result->fetchField(), 'Field CONCAT works.');
   }
 
   /**
@@ -49,7 +49,7 @@ public function testConcatWsLiterals() {
       ':a3' => '',
       ':a4' => 'world.',
     ]);
-    $this->assertIdentical($result->fetchField(), 'Hello, , world.');
+    $this->assertSame('Hello, , world.', $result->fetchField());
   }
 
   /**
@@ -61,7 +61,7 @@ public function testConcatWsFields() {
       ':a2' => 'age',
       ':age' => 25,
     ]);
-    $this->assertIdentical($result->fetchField(), 'name-John-age-25');
+    $this->assertSame('name-John-age-25', $result->fetchField());
   }
 
   /**
@@ -80,14 +80,14 @@ public function testLikeEscape() {
       ->countQuery()
       ->execute()
       ->fetchField();
-    $this->assertIdentical($num_matches, '2', 'Found 2 records.');
+    $this->assertSame('2', $num_matches, 'Found 2 records.');
     // Match only "Ring_" using a LIKE expression with no wildcards.
     $num_matches = db_select('test', 't')
       ->condition('name', db_like('Ring_'), 'LIKE')
       ->countQuery()
       ->execute()
       ->fetchField();
-    $this->assertIdentical($num_matches, '1', 'Found 1 record.');
+    $this->assertSame('1', $num_matches, 'Found 1 record.');
   }
 
   /**
@@ -111,14 +111,14 @@ public function testLikeBackslash() {
       ->countQuery()
       ->execute()
       ->fetchField();
-    $this->assertIdentical($num_matches, '2', 'Found 2 records.');
+    $this->assertSame('2', $num_matches, 'Found 2 records.');
     // Match only the former using a LIKE expression with no wildcards.
     $num_matches = db_select('test', 't')
       ->condition('name', db_like('abc%\_'), 'LIKE')
       ->countQuery()
       ->execute()
       ->fetchField();
-    $this->assertIdentical($num_matches, '1', 'Found 1 record.');
+    $this->assertSame('1', $num_matches, 'Found 1 record.');
   }
 
   /**
@@ -130,7 +130,7 @@ public function testGetFullQualifiedTableName() {
       ->countQuery()
       ->execute()
       ->fetchField();
-    $this->assertIdentical($num_matches, '4', 'Found 4 records.');
+    $this->assertSame('4', $num_matches, 'Found 4 records.');
   }
 
 }
diff --git a/core/tests/Drupal/KernelTests/Core/Database/CaseSensitivityTest.php b/core/tests/Drupal/KernelTests/Core/Database/CaseSensitivityTest.php
index c3e766f..11257d4 100644
--- a/core/tests/Drupal/KernelTests/Core/Database/CaseSensitivityTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Database/CaseSensitivityTest.php
@@ -23,9 +23,9 @@ public function testCaseSensitiveInsert() {
       ->execute();
 
     $num_records_after = db_query('SELECT COUNT(*) FROM {test}')->fetchField();
-    $this->assertIdentical($num_records_before + 1, (int) $num_records_after, 'Record inserts correctly.');
+    $this->assertSame($num_records_before + 1, (int) $num_records_after, 'Record inserts correctly.');
     $saved_age = db_query('SELECT age FROM {test} WHERE name = :name', [':name' => 'john'])->fetchField();
-    $this->assertIdentical($saved_age, '2', 'Can retrieve after inserting.');
+    $this->assertSame('2', $saved_age, 'Can retrieve after inserting.');
   }
 
 }
diff --git a/core/tests/Drupal/KernelTests/Core/Database/ConnectionTest.php b/core/tests/Drupal/KernelTests/Core/Database/ConnectionTest.php
index e95afe0..cdc780e 100644
--- a/core/tests/Drupal/KernelTests/Core/Database/ConnectionTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Database/ConnectionTest.php
@@ -32,18 +32,18 @@ public function testConnectionRouting() {
     // Try to open those targets another time, that should return the same objects.
     $db1b = Database::getConnection('default', 'default');
     $db2b = Database::getConnection('replica', 'default');
-    $this->assertIdentical($db1, $db1b, 'A second call to getConnection() returns the same object.');
-    $this->assertIdentical($db2, $db2b, 'A second call to getConnection() returns the same object.');
+    $this->assertSame($db1, $db1b, 'A second call to getConnection() returns the same object.');
+    $this->assertSame($db2, $db2b, 'A second call to getConnection() returns the same object.');
 
     // Try to open an unknown target.
     $unknown_target = $this->randomMachineName();
     $db3 = Database::getConnection($unknown_target, 'default');
     $this->assertNotNull($db3, 'Opening an unknown target returns a real connection object.');
-    $this->assertIdentical($db1, $db3, 'An unknown target opens the default connection.');
+    $this->assertSame($db1, $db3, 'An unknown target opens the default connection.');
 
     // Try to open that unknown target another time, that should return the same object.
     $db3b = Database::getConnection($unknown_target, 'default');
-    $this->assertIdentical($db3, $db3b, 'A second call to getConnection() returns the same object.');
+    $this->assertSame($db3, $db3b, 'A second call to getConnection() returns the same object.');
   }
 
   /**
@@ -61,7 +61,7 @@ public function testConnectionRoutingOverride() {
     $db1 = Database::getConnection('default', 'default');
     $db2 = Database::getConnection('replica', 'default');
 
-    $this->assertIdentical($db1, $db2, 'Both targets refer to the same connection.');
+    $this->assertSame($db1, $db2, 'Both targets refer to the same connection.');
   }
 
   /**
@@ -103,7 +103,7 @@ public function testConnectionOptions() {
 
     // Get a fresh copy of the default connection options.
     $connectionOptions = $db->getConnectionOptions();
-    $this->assertIdentical($connectionOptions, $connectionOptions2, 'The default and replica connection options are identical.');
+    $this->assertSame($connectionOptions, $connectionOptions2, 'The default and replica connection options are identical.');
 
     // Set up a new connection with different connection info.
     $test = $connection_info['default'];
@@ -168,9 +168,9 @@ public function testPostgresqlReservedWords() {
     $stmt->execute();
     foreach ($stmt->fetchAllAssoc('word') as $word => $row) {
       $expected = '"' . $word . '"';
-      $this->assertIdentical($db->escapeTable($word), $expected, format_string('The reserved word %word was correctly escaped when used as a table name.', ['%word' => $word]));
-      $this->assertIdentical($db->escapeField($word), $expected, format_string('The reserved word %word was correctly escaped when used as a column name.', ['%word' => $word]));
-      $this->assertIdentical($db->escapeAlias($word), $expected, format_string('The reserved word %word was correctly escaped when used as an alias.', ['%word' => $word]));
+      $this->assertSame($expected, $db->escapeTable($word), format_string('The reserved word %word was correctly escaped when used as a table name.', ['%word' => $word]));
+      $this->assertSame($expected, $db->escapeField($word), format_string('The reserved word %word was correctly escaped when used as a column name.', ['%word' => $word]));
+      $this->assertSame($expected, $db->escapeAlias($word), format_string('The reserved word %word was correctly escaped when used as an alias.', ['%word' => $word]));
     }
   }
 
diff --git a/core/tests/Drupal/KernelTests/Core/Database/ConnectionUnitTest.php b/core/tests/Drupal/KernelTests/Core/Database/ConnectionUnitTest.php
index f73f415..6d0d1ee 100644
--- a/core/tests/Drupal/KernelTests/Core/Database/ConnectionUnitTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Database/ConnectionUnitTest.php
@@ -55,7 +55,7 @@ protected function addConnection() {
     // Verify that the new target exists.
     $info = Database::getConnectionInfo($this->key);
     // Note: Custom assertion message to not expose database credentials.
-    $this->assertIdentical($info[$this->target], $connection_info[$this->key], 'New connection info found.');
+    $this->assertSame($connection_info[$this->key], $info[$this->target], 'New connection info found.');
   }
 
   /**
diff --git a/core/tests/Drupal/KernelTests/Core/Database/DeleteTruncateTest.php b/core/tests/Drupal/KernelTests/Core/Database/DeleteTruncateTest.php
index 8d73661..97641bb 100644
--- a/core/tests/Drupal/KernelTests/Core/Database/DeleteTruncateTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Database/DeleteTruncateTest.php
@@ -47,7 +47,7 @@ public function testSimpleDelete() {
     $num_deleted = db_delete('test')
       ->condition('id', 1)
       ->execute();
-    $this->assertIdentical($num_deleted, 1, 'Deleted 1 record.');
+    $this->assertSame(1, $num_deleted, 'Deleted 1 record.');
 
     $num_records_after = db_query('SELECT COUNT(*) FROM {test}')->fetchField();
     $this->assertEqual($num_records_before, $num_records_after + $num_deleted, 'Deletion adds up.');
@@ -75,7 +75,7 @@ public function testSpecialColumnDelete() {
     $num_deleted = db_delete('test_special_columns')
       ->condition('id', 1)
       ->execute();
-    $this->assertIdentical($num_deleted, 1, 'Deleted 1 special column record.');
+    $this->assertSame(1, $num_deleted, 'Deleted 1 special column record.');
 
     $num_records_after = db_query('SELECT COUNT(*) FROM {test_special_columns}')->fetchField();
     $this->assertEqual($num_records_before, $num_records_after + $num_deleted, 'Deletion adds up.');
diff --git a/core/tests/Drupal/KernelTests/Core/Database/FetchTest.php b/core/tests/Drupal/KernelTests/Core/Database/FetchTest.php
index e55590e..236e071 100644
--- a/core/tests/Drupal/KernelTests/Core/Database/FetchTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Database/FetchTest.php
@@ -25,10 +25,10 @@ public function testQueryFetchDefault() {
     foreach ($result as $record) {
       $records[] = $record;
       $this->assertTrue(is_object($record), 'Record is an object.');
-      $this->assertIdentical($record->name, 'John', '25 year old is John.');
+      $this->assertSame('John', $record->name, '25 year old is John.');
     }
 
-    $this->assertIdentical(count($records), 1, 'There is only one record.');
+    $this->assertSame(1, count($records), 'There is only one record.');
   }
 
   /**
@@ -40,10 +40,10 @@ public function testQueryFetchObject() {
     foreach ($result as $record) {
       $records[] = $record;
       $this->assertTrue(is_object($record), 'Record is an object.');
-      $this->assertIdentical($record->name, 'John', '25 year old is John.');
+      $this->assertSame('John', $record->name, '25 year old is John.');
     }
 
-    $this->assertIdentical(count($records), 1, 'There is only one record.');
+    $this->assertSame(1, count($records), 'There is only one record.');
   }
 
   /**
@@ -55,11 +55,11 @@ public function testQueryFetchArray() {
     foreach ($result as $record) {
       $records[] = $record;
       if ($this->assertTrue(is_array($record), 'Record is an array.')) {
-        $this->assertIdentical($record['name'], 'John', 'Record can be accessed associatively.');
+        $this->assertSame('John', $record['name'], 'Record can be accessed associatively.');
       }
     }
 
-    $this->assertIdentical(count($records), 1, 'There is only one record.');
+    $this->assertSame(1, count($records), 'There is only one record.');
   }
 
   /**
@@ -73,11 +73,11 @@ public function testQueryFetchClass() {
     foreach ($result as $record) {
       $records[] = $record;
       if ($this->assertTrue($record instanceof FakeRecord, 'Record is an object of class FakeRecord.')) {
-        $this->assertIdentical($record->name, 'John', '25 year old is John.');
+        $this->assertSame('John', $record->name, '25 year old is John.');
       }
     }
 
-    $this->assertIdentical(count($records), 1, 'There is only one record.');
+    $this->assertSame(1, count($records), 'There is only one record.');
   }
 
   /**
@@ -89,11 +89,11 @@ public function testQueryFetchNum() {
     foreach ($result as $record) {
       $records[] = $record;
       if ($this->assertTrue(is_array($record), 'Record is an array.')) {
-        $this->assertIdentical($record[0], 'John', 'Record can be accessed numerically.');
+        $this->assertSame('John', $record[0], 'Record can be accessed numerically.');
       }
     }
 
-    $this->assertIdentical(count($records), 1, 'There is only one record');
+    $this->assertSame(1, count($records), 'There is only one record');
   }
 
   /**
@@ -105,12 +105,12 @@ public function testQueryFetchBoth() {
     foreach ($result as $record) {
       $records[] = $record;
       if ($this->assertTrue(is_array($record), 'Record is an array.')) {
-        $this->assertIdentical($record[0], 'John', 'Record can be accessed numerically.');
-        $this->assertIdentical($record['name'], 'John', 'Record can be accessed associatively.');
+        $this->assertSame('John', $record[0], 'Record can be accessed numerically.');
+        $this->assertSame('John', $record['name'], 'Record can be accessed associatively.');
       }
     }
 
-    $this->assertIdentical(count($records), 1, 'There is only one record.');
+    $this->assertSame(1, count($records), 'There is only one record.');
   }
 
   /**
@@ -132,12 +132,12 @@ public function testQueryFetchAllColumn() {
   public function testQueryFetchCol() {
     $result = db_query('SELECT name FROM {test} WHERE age > :age', [':age' => 25]);
     $column = $result->fetchCol();
-    $this->assertIdentical(count($column), 3, 'fetchCol() returns the right number of records.');
+    $this->assertSame(3, count($column), 'fetchCol() returns the right number of records.');
 
     $result = db_query('SELECT name FROM {test} WHERE age > :age', [':age' => 25]);
     $i = 0;
     foreach ($result as $record) {
-      $this->assertIdentical($record->name, $column[$i++], 'Column matches direct access.');
+      $this->assertSame($column[$i++], $record->name, 'Column matches direct access.');
     }
   }
 
diff --git a/core/tests/Drupal/KernelTests/Core/Database/InsertDefaultsTest.php b/core/tests/Drupal/KernelTests/Core/Database/InsertDefaultsTest.php
index 5b6c03e..b5963cf 100644
--- a/core/tests/Drupal/KernelTests/Core/Database/InsertDefaultsTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Database/InsertDefaultsTest.php
@@ -40,7 +40,7 @@ public function testDefaultEmptyInsert() {
     }
 
     $num_records_after = (int) db_query('SELECT COUNT(*) FROM {test}')->fetchField();
-    $this->assertIdentical($num_records_before, $num_records_after, 'Do nothing as no fields are specified.');
+    $this->assertSame($num_records_before, $num_records_after, 'Do nothing as no fields are specified.');
   }
 
   /**
diff --git a/core/tests/Drupal/KernelTests/Core/Database/InsertTest.php b/core/tests/Drupal/KernelTests/Core/Database/InsertTest.php
index 1c2c21d..0ef9d99 100644
--- a/core/tests/Drupal/KernelTests/Core/Database/InsertTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Database/InsertTest.php
@@ -22,13 +22,13 @@ public function testSimpleInsert() {
     ]);
 
     // Check how many records are queued for insertion.
-    $this->assertIdentical($query->count(), 1, 'One record is queued for insertion.');
+    $this->assertSame(1, $query->count(), 'One record is queued for insertion.');
     $query->execute();
 
     $num_records_after = db_query('SELECT COUNT(*) FROM {test}')->fetchField();
-    $this->assertIdentical($num_records_before + 1, (int) $num_records_after, 'Record inserts correctly.');
+    $this->assertSame($num_records_before + 1, (int) $num_records_after, 'Record inserts correctly.');
     $saved_age = db_query('SELECT age FROM {test} WHERE name = :name', [':name' => 'Yoko'])->fetchField();
-    $this->assertIdentical($saved_age, '29', 'Can retrieve after inserting.');
+    $this->assertSame('29', $saved_age, 'Can retrieve after inserting.');
   }
 
   /**
@@ -50,24 +50,24 @@ public function testMultiInsert() {
     ]);
 
     // Check how many records are queued for insertion.
-    $this->assertIdentical($query->count(), 2, 'Two records are queued for insertion.');
+    $this->assertSame(2, $query->count(), 'Two records are queued for insertion.');
 
     // We should be able to say "use the field order".
     // This is not the recommended mechanism for most cases, but it should work.
     $query->values(['Moe', '32']);
 
     // Check how many records are queued for insertion.
-    $this->assertIdentical($query->count(), 3, 'Three records are queued for insertion.');
+    $this->assertSame(3, $query->count(), 'Three records are queued for insertion.');
     $query->execute();
 
     $num_records_after = (int) db_query('SELECT COUNT(*) FROM {test}')->fetchField();
-    $this->assertIdentical($num_records_before + 3, $num_records_after, 'Record inserts correctly.');
+    $this->assertSame($num_records_before + 3, $num_records_after, 'Record inserts correctly.');
     $saved_age = db_query('SELECT age FROM {test} WHERE name = :name', [':name' => 'Larry'])->fetchField();
-    $this->assertIdentical($saved_age, '30', 'Can retrieve after inserting.');
+    $this->assertSame('30', $saved_age, 'Can retrieve after inserting.');
     $saved_age = db_query('SELECT age FROM {test} WHERE name = :name', [':name' => 'Curly'])->fetchField();
-    $this->assertIdentical($saved_age, '31', 'Can retrieve after inserting.');
+    $this->assertSame('31', $saved_age, 'Can retrieve after inserting.');
     $saved_age = db_query('SELECT age FROM {test} WHERE name = :name', [':name' => 'Moe'])->fetchField();
-    $this->assertIdentical($saved_age, '32', 'Can retrieve after inserting.');
+    $this->assertSame('32', $saved_age, 'Can retrieve after inserting.');
   }
 
   /**
@@ -83,7 +83,7 @@ public function testRepeatedInsert() {
       'age' => '30',
     ]);
     // Check how many records are queued for insertion.
-    $this->assertIdentical($query->count(), 1, 'One record is queued for insertion.');
+    $this->assertSame(1, $query->count(), 'One record is queued for insertion.');
     $query->execute();  // This should run the insert, but leave the fields intact.
 
     // We should be able to specify values in any order if named.
@@ -92,24 +92,24 @@ public function testRepeatedInsert() {
       'name' => 'Curly',
     ]);
     // Check how many records are queued for insertion.
-    $this->assertIdentical($query->count(), 1, 'One record is queued for insertion.');
+    $this->assertSame(1, $query->count(), 'One record is queued for insertion.');
     $query->execute();
 
     // We should be able to say "use the field order".
     $query->values(['Moe', '32']);
 
     // Check how many records are queued for insertion.
-    $this->assertIdentical($query->count(), 1, 'One record is queued for insertion.');
+    $this->assertSame(1, $query->count(), 'One record is queued for insertion.');
     $query->execute();
 
     $num_records_after = db_query('SELECT COUNT(*) FROM {test}')->fetchField();
-    $this->assertIdentical((int) $num_records_before + 3, (int) $num_records_after, 'Record inserts correctly.');
+    $this->assertSame((int) $num_records_before + 3, (int) $num_records_after, 'Record inserts correctly.');
     $saved_age = db_query('SELECT age FROM {test} WHERE name = :name', [':name' => 'Larry'])->fetchField();
-    $this->assertIdentical($saved_age, '30', 'Can retrieve after inserting.');
+    $this->assertSame('30', $saved_age, 'Can retrieve after inserting.');
     $saved_age = db_query('SELECT age FROM {test} WHERE name = :name', [':name' => 'Curly'])->fetchField();
-    $this->assertIdentical($saved_age, '31', 'Can retrieve after inserting.');
+    $this->assertSame('31', $saved_age, 'Can retrieve after inserting.');
     $saved_age = db_query('SELECT age FROM {test} WHERE name = :name', [':name' => 'Moe'])->fetchField();
-    $this->assertIdentical($saved_age, '32', 'Can retrieve after inserting.');
+    $this->assertSame('32', $saved_age, 'Can retrieve after inserting.');
   }
 
   /**
@@ -125,11 +125,11 @@ public function testInsertFieldOnlyDefinition() {
       ->values(['Moe', '32'])
       ->execute();
     $saved_age = db_query('SELECT age FROM {test} WHERE name = :name', [':name' => 'Larry'])->fetchField();
-    $this->assertIdentical($saved_age, '30', 'Can retrieve after inserting.');
+    $this->assertSame('30', $saved_age, 'Can retrieve after inserting.');
     $saved_age = db_query('SELECT age FROM {test} WHERE name = :name', [':name' => 'Curly'])->fetchField();
-    $this->assertIdentical($saved_age, '31', 'Can retrieve after inserting.');
+    $this->assertSame('31', $saved_age, 'Can retrieve after inserting.');
     $saved_age = db_query('SELECT age FROM {test} WHERE name = :name', [':name' => 'Moe'])->fetchField();
-    $this->assertIdentical($saved_age, '32', 'Can retrieve after inserting.');
+    $this->assertSame('32', $saved_age, 'Can retrieve after inserting.');
   }
 
   /**
@@ -143,7 +143,7 @@ public function testInsertLastInsertID() {
       ])
       ->execute();
 
-    $this->assertIdentical($id, '5', 'Auto-increment ID returned successfully.');
+    $this->assertSame('5', $id, 'Auto-increment ID returned successfully.');
   }
 
   /**
@@ -169,7 +169,7 @@ public function testInsertSelectFields() {
       ->execute();
 
     $saved_age = db_query('SELECT age FROM {test} WHERE name = :name', [':name' => 'Meredith'])->fetchField();
-    $this->assertIdentical($saved_age, '30', 'Can retrieve after inserting.');
+    $this->assertSame('30', $saved_age, 'Can retrieve after inserting.');
   }
 
   /**
@@ -190,7 +190,7 @@ public function testInsertSelectAll() {
       ->execute();
 
     $saved_age = db_query('SELECT age FROM {test_people_copy} WHERE name = :name', [':name' => 'Meredith'])->fetchField();
-    $this->assertIdentical($saved_age, '30', 'Can retrieve after inserting.');
+    $this->assertSame('30', $saved_age, 'Can retrieve after inserting.');
   }
 
   /**
@@ -204,7 +204,7 @@ public function testSpecialColumnInsert() {
       ])
       ->execute();
     $saved_value = db_query('SELECT "offset" FROM {test_special_columns} WHERE id = :id', [':id' => 2])->fetchField();
-    $this->assertIdentical($saved_value, 'Offset value 2', 'Can retrieve special column name value after inserting.');
+    $this->assertSame('Offset value 2', $saved_value, 'Can retrieve special column name value after inserting.');
   }
 
 }
diff --git a/core/tests/Drupal/KernelTests/Core/Database/RegressionTest.php b/core/tests/Drupal/KernelTests/Core/Database/RegressionTest.php
index db4c7de..66eed0a 100644
--- a/core/tests/Drupal/KernelTests/Core/Database/RegressionTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Database/RegressionTest.php
@@ -30,31 +30,31 @@ public function testRegression_310447() {
       ])->execute();
 
     $from_database = db_query('SELECT job FROM {test} WHERE job = :job', [':job' => $job])->fetchField();
-    $this->assertIdentical($job, $from_database, 'The database handles UTF-8 characters cleanly.');
+    $this->assertSame($job, $from_database, 'The database handles UTF-8 characters cleanly.');
   }
 
   /**
    * Tests the db_table_exists() function.
    */
   public function testDBTableExists() {
-    $this->assertIdentical(TRUE, db_table_exists('test'), 'Returns true for existent table.');
-    $this->assertIdentical(FALSE, db_table_exists('nosuchtable'), 'Returns false for nonexistent table.');
+    $this->assertSame(TRUE, db_table_exists('test'), 'Returns true for existent table.');
+    $this->assertSame(FALSE, db_table_exists('nosuchtable'), 'Returns false for nonexistent table.');
   }
 
   /**
    * Tests the db_field_exists() function.
    */
   public function testDBFieldExists() {
-    $this->assertIdentical(TRUE, db_field_exists('test', 'name'), 'Returns true for existent column.');
-    $this->assertIdentical(FALSE, db_field_exists('test', 'nosuchcolumn'), 'Returns false for nonexistent column.');
+    $this->assertSame(TRUE, db_field_exists('test', 'name'), 'Returns true for existent column.');
+    $this->assertSame(FALSE, db_field_exists('test', 'nosuchcolumn'), 'Returns false for nonexistent column.');
   }
 
   /**
    * Tests the db_index_exists() function.
    */
   public function testDBIndexExists() {
-    $this->assertIdentical(TRUE, db_index_exists('test', 'ages'), 'Returns true for existent index.');
-    $this->assertIdentical(FALSE, db_index_exists('test', 'nosuchindex'), 'Returns false for nonexistent index.');
+    $this->assertSame(TRUE, db_index_exists('test', 'ages'), 'Returns true for existent index.');
+    $this->assertSame(FALSE, db_index_exists('test', 'nosuchindex'), 'Returns false for nonexistent index.');
   }
 
 }
diff --git a/core/tests/Drupal/KernelTests/Core/Database/SchemaTest.php b/core/tests/Drupal/KernelTests/Core/Database/SchemaTest.php
index e239098..76d51a5 100644
--- a/core/tests/Drupal/KernelTests/Core/Database/SchemaTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Database/SchemaTest.php
@@ -93,12 +93,12 @@ public function testSchema() {
 
     // Test for fake index and test for the boolean result of indexExists().
     $index_exists = Database::getConnection()->schema()->indexExists('test_table', 'test_field');
-    $this->assertIdentical($index_exists, FALSE, 'Fake index does not exists');
+    $this->assertSame(FALSE, $index_exists, 'Fake index does not exists');
     // Add index.
     db_add_index('test_table', 'test_field', ['test_field'], $table_specification);
     // Test for created index and test for the boolean result of indexExists().
     $index_exists = Database::getConnection()->schema()->indexExists('test_table', 'test_field');
-    $this->assertIdentical($index_exists, TRUE, 'Index created.');
+    $this->assertSame(TRUE, $index_exists, 'Index created.');
 
     // Rename the table.
     db_rename_table('test_table', 'test_table2');
@@ -204,8 +204,8 @@ public function testSchema() {
         $unique_key_exists = Database::getConnection()->schema()->indexExists('test_table', 'test_field');
         break;
     }
-    $this->assertIdentical($primary_key_exists, TRUE, 'Primary key created.');
-    $this->assertIdentical($unique_key_exists, TRUE, 'Unique key created.');
+    $this->assertSame(TRUE, $primary_key_exists, 'Primary key created.');
+    $this->assertSame(TRUE, $unique_key_exists, 'Unique key created.');
 
     db_rename_table('test_table', 'test_table2');
 
@@ -225,8 +225,8 @@ public function testSchema() {
         $renamed_unique_key_exists = Database::getConnection()->schema()->indexExists('test_table2', 'test_field');
         break;
     }
-    $this->assertIdentical($renamed_primary_key_exists, TRUE, 'Primary key was renamed.');
-    $this->assertIdentical($renamed_unique_key_exists, TRUE, 'Unique key was renamed.');
+    $this->assertSame(TRUE, $renamed_primary_key_exists, 'Primary key was renamed.');
+    $this->assertSame(TRUE, $renamed_unique_key_exists, 'Unique key was renamed.');
 
     // For PostgreSQL check in addition that sequence was renamed.
     if ($db_type == 'pgsql') {
@@ -758,7 +758,7 @@ protected function assertFieldChange($old_spec, $new_spec, $test_data = NULL) {
         ->condition('serial_column', $id)
         ->execute()
         ->fetchField();
-      $this->assertIdentical($field_value, $test_data);
+      $this->assertSame($test_data, $field_value);
     }
 
     // Check the field was changed.
diff --git a/core/tests/Drupal/KernelTests/Core/Database/TransactionTest.php b/core/tests/Drupal/KernelTests/Core/Database/TransactionTest.php
index a07045d..9befd7e 100644
--- a/core/tests/Drupal/KernelTests/Core/Database/TransactionTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Database/TransactionTest.php
@@ -184,9 +184,9 @@ public function testTransactionRollBackNotSupported() {
       // Because our current database claims to not support transactions,
       // the inserted rows should be present despite the attempt to roll back.
       $saved_age = db_query('SELECT age FROM {test} WHERE name = :name', [':name' => 'DavidB'])->fetchField();
-      $this->assertIdentical($saved_age, '24', 'DavidB not rolled back, since transactions are not supported.');
+      $this->assertSame('24', $saved_age, 'DavidB not rolled back, since transactions are not supported.');
       $saved_age = db_query('SELECT age FROM {test} WHERE name = :name', [':name' => 'DanielB'])->fetchField();
-      $this->assertIdentical($saved_age, '19', 'DanielB not rolled back, since transactions are not supported.');
+      $this->assertSame('19', $saved_age, 'DanielB not rolled back, since transactions are not supported.');
     }
     catch (\Exception $e) {
       $this->fail($e->getMessage());
@@ -206,9 +206,9 @@ public function testCommittedTransaction() {
 
       // Because we committed, both of the inserted rows should be present.
       $saved_age = db_query('SELECT age FROM {test} WHERE name = :name', [':name' => 'DavidA'])->fetchField();
-      $this->assertIdentical($saved_age, '24', 'Can retrieve DavidA row after commit.');
+      $this->assertSame('24', $saved_age, 'Can retrieve DavidA row after commit.');
       $saved_age = db_query('SELECT age FROM {test} WHERE name = :name', [':name' => 'DanielA'])->fetchField();
-      $this->assertIdentical($saved_age, '19', 'Can retrieve DanielA row after commit.');
+      $this->assertSame('19', $saved_age, 'Can retrieve DanielA row after commit.');
     }
     catch (\Exception $e) {
       $this->fail($e->getMessage());
diff --git a/core/tests/Drupal/KernelTests/Core/Database/UpdateComplexTest.php b/core/tests/Drupal/KernelTests/Core/Database/UpdateComplexTest.php
index 69d5d5d..fe4ca49 100644
--- a/core/tests/Drupal/KernelTests/Core/Database/UpdateComplexTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Database/UpdateComplexTest.php
@@ -22,10 +22,10 @@ public function testOrConditionUpdate() {
         ->condition('name', 'Paul')
       );
     $num_updated = $update->execute();
-    $this->assertIdentical($num_updated, 2, 'Updated 2 records.');
+    $this->assertSame(2, $num_updated, 'Updated 2 records.');
 
     $num_matches = db_query('SELECT COUNT(*) FROM {test} WHERE job = :job', [':job' => 'Musician'])->fetchField();
-    $this->assertIdentical($num_matches, '2', 'Updated fields successfully.');
+    $this->assertSame('2', $num_matches, 'Updated fields successfully.');
   }
 
   /**
@@ -36,10 +36,10 @@ public function testInConditionUpdate() {
       ->fields(['job' => 'Musician'])
       ->condition('name', ['John', 'Paul'], 'IN')
       ->execute();
-    $this->assertIdentical($num_updated, 2, 'Updated 2 records.');
+    $this->assertSame(2, $num_updated, 'Updated 2 records.');
 
     $num_matches = db_query('SELECT COUNT(*) FROM {test} WHERE job = :job', [':job' => 'Musician'])->fetchField();
-    $this->assertIdentical($num_matches, '2', 'Updated fields successfully.');
+    $this->assertSame('2', $num_matches, 'Updated fields successfully.');
   }
 
   /**
@@ -52,10 +52,10 @@ public function testNotInConditionUpdate() {
       ->fields(['job' => 'Musician'])
       ->condition('name', ['John', 'Paul', 'George'], 'NoT IN')
       ->execute();
-    $this->assertIdentical($num_updated, 1, 'Updated 1 record.');
+    $this->assertSame(1, $num_updated, 'Updated 1 record.');
 
     $num_matches = db_query('SELECT COUNT(*) FROM {test} WHERE job = :job', [':job' => 'Musician'])->fetchField();
-    $this->assertIdentical($num_matches, '1', 'Updated fields successfully.');
+    $this->assertSame('1', $num_matches, 'Updated fields successfully.');
   }
 
   /**
@@ -66,10 +66,10 @@ public function testBetweenConditionUpdate() {
       ->fields(['job' => 'Musician'])
       ->condition('age', [25, 26], 'BETWEEN')
       ->execute();
-    $this->assertIdentical($num_updated, 2, 'Updated 2 records.');
+    $this->assertSame(2, $num_updated, 'Updated 2 records.');
 
     $num_matches = db_query('SELECT COUNT(*) FROM {test} WHERE job = :job', [':job' => 'Musician'])->fetchField();
-    $this->assertIdentical($num_matches, '2', 'Updated fields successfully.');
+    $this->assertSame('2', $num_matches, 'Updated fields successfully.');
   }
 
   /**
@@ -80,10 +80,10 @@ public function testLikeConditionUpdate() {
       ->fields(['job' => 'Musician'])
       ->condition('name', '%ge%', 'LIKE')
       ->execute();
-    $this->assertIdentical($num_updated, 1, 'Updated 1 record.');
+    $this->assertSame(1, $num_updated, 'Updated 1 record.');
 
     $num_matches = db_query('SELECT COUNT(*) FROM {test} WHERE job = :job', [':job' => 'Musician'])->fetchField();
-    $this->assertIdentical($num_matches, '1', 'Updated fields successfully.');
+    $this->assertSame('1', $num_matches, 'Updated fields successfully.');
   }
 
   /**
@@ -96,10 +96,10 @@ public function testUpdateExpression() {
       ->fields(['job' => 'Musician'])
       ->expression('age', 'age + :age', [':age' => 4])
       ->execute();
-    $this->assertIdentical($num_updated, 1, 'Updated 1 record.');
+    $this->assertSame(1, $num_updated, 'Updated 1 record.');
 
     $num_matches = db_query('SELECT COUNT(*) FROM {test} WHERE job = :job', [':job' => 'Musician'])->fetchField();
-    $this->assertIdentical($num_matches, '1', 'Updated fields successfully.');
+    $this->assertSame('1', $num_matches, 'Updated fields successfully.');
 
     $person = db_query('SELECT * FROM {test} WHERE name = :name', [':name' => 'Ringo'])->fetch();
     $this->assertEqual($person->name, 'Ringo', 'Name set correctly.');
@@ -116,7 +116,7 @@ public function testUpdateOnlyExpression() {
       ->condition('name', 'Ringo')
       ->expression('age', 'age + :age', [':age' => 4])
       ->execute();
-    $this->assertIdentical($num_updated, 1, 'Updated 1 record.');
+    $this->assertSame(1, $num_updated, 'Updated 1 record.');
 
     $after_age = db_query('SELECT age FROM {test} WHERE name = :name', [':name' => 'Ringo'])->fetchField();
     $this->assertEqual($before_age + 4, $after_age, 'Age updated correctly');
diff --git a/core/tests/Drupal/KernelTests/Core/Database/UpdateTest.php b/core/tests/Drupal/KernelTests/Core/Database/UpdateTest.php
index 6bc9131..a0ffc57 100644
--- a/core/tests/Drupal/KernelTests/Core/Database/UpdateTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Database/UpdateTest.php
@@ -17,10 +17,10 @@ public function testSimpleUpdate() {
       ->fields(['name' => 'Tiffany'])
       ->condition('id', 1)
       ->execute();
-    $this->assertIdentical($num_updated, 1, 'Updated 1 record.');
+    $this->assertSame(1, $num_updated, 'Updated 1 record.');
 
     $saved_name = db_query('SELECT name FROM {test} WHERE id = :id', [':id' => 1])->fetchField();
-    $this->assertIdentical($saved_name, 'Tiffany', 'Updated name successfully.');
+    $this->assertSame('Tiffany', $saved_name, 'Updated name successfully.');
   }
 
   /**
@@ -32,7 +32,7 @@ public function testSimpleNullUpdate() {
       ->fields(['age' => NULL])
       ->condition('name', 'Kermit')
       ->execute();
-    $this->assertIdentical($num_updated, 1, 'Updated 1 record.');
+    $this->assertSame(1, $num_updated, 'Updated 1 record.');
 
     $saved_age = db_query('SELECT age FROM {test_null} WHERE name = :name', [':name' => 'Kermit'])->fetchField();
     $this->assertNull($saved_age, 'Updated name successfully.');
@@ -46,10 +46,10 @@ public function testMultiUpdate() {
       ->fields(['job' => 'Musician'])
       ->condition('job', 'Singer')
       ->execute();
-    $this->assertIdentical($num_updated, 2, 'Updated 2 records.');
+    $this->assertSame(2, $num_updated, 'Updated 2 records.');
 
     $num_matches = db_query('SELECT COUNT(*) FROM {test} WHERE job = :job', [':job' => 'Musician'])->fetchField();
-    $this->assertIdentical($num_matches, '2', 'Updated fields successfully.');
+    $this->assertSame('2', $num_matches, 'Updated fields successfully.');
   }
 
   /**
@@ -60,10 +60,10 @@ public function testMultiGTUpdate() {
       ->fields(['job' => 'Musician'])
       ->condition('age', 26, '>')
       ->execute();
-    $this->assertIdentical($num_updated, 2, 'Updated 2 records.');
+    $this->assertSame(2, $num_updated, 'Updated 2 records.');
 
     $num_matches = db_query('SELECT COUNT(*) FROM {test} WHERE job = :job', [':job' => 'Musician'])->fetchField();
-    $this->assertIdentical($num_matches, '2', 'Updated fields successfully.');
+    $this->assertSame('2', $num_matches, 'Updated fields successfully.');
   }
 
   /**
@@ -74,10 +74,10 @@ public function testWhereUpdate() {
       ->fields(['job' => 'Musician'])
       ->where('age > :age', [':age' => 26])
       ->execute();
-    $this->assertIdentical($num_updated, 2, 'Updated 2 records.');
+    $this->assertSame(2, $num_updated, 'Updated 2 records.');
 
     $num_matches = db_query('SELECT COUNT(*) FROM {test} WHERE job = :job', [':job' => 'Musician'])->fetchField();
-    $this->assertIdentical($num_matches, '2', 'Updated fields successfully.');
+    $this->assertSame('2', $num_matches, 'Updated fields successfully.');
   }
 
   /**
@@ -89,10 +89,10 @@ public function testWhereAndConditionUpdate() {
       ->where('age > :age', [':age' => 26])
       ->condition('name', 'Ringo');
     $num_updated = $update->execute();
-    $this->assertIdentical($num_updated, 1, 'Updated 1 record.');
+    $this->assertSame(1, $num_updated, 'Updated 1 record.');
 
     $num_matches = db_query('SELECT COUNT(*) FROM {test} WHERE job = :job', [':job' => 'Musician'])->fetchField();
-    $this->assertIdentical($num_matches, '1', 'Updated fields successfully.');
+    $this->assertSame('1', $num_matches, 'Updated fields successfully.');
   }
 
   /**
@@ -104,10 +104,10 @@ public function testExpressionUpdate() {
     $num_rows = db_update('test')
       ->expression('age', 'age * age')
       ->execute();
-    $this->assertIdentical($num_rows, 4, 'Updated 4 records.');
+    $this->assertSame(4, $num_rows, 'Updated 4 records.');
 
     $saved_name = db_query('SELECT name FROM {test} WHERE age = :age', [':age' => pow(26, 2)])->fetchField();
-    $this->assertIdentical($saved_name, 'Paul', 'Successfully updated values using an algebraic expression.');
+    $this->assertSame('Paul', $saved_name, 'Successfully updated values using an algebraic expression.');
   }
 
   /**
@@ -124,7 +124,7 @@ public function testUpdateAffectedRows() {
       ->condition('priority', 1, '<>')
       ->fields(['task' => 'sleep'])
       ->execute();
-    $this->assertIdentical($num_rows, 5, 'Correctly returned 5 affected rows.');
+    $this->assertSame(5, $num_rows, 'Correctly returned 5 affected rows.');
   }
 
   /**
@@ -135,10 +135,10 @@ public function testPrimaryKeyUpdate() {
       ->fields(['id' => 42, 'name' => 'John'])
       ->condition('id', 1)
       ->execute();
-    $this->assertIdentical($num_updated, 1, 'Updated 1 record.');
+    $this->assertSame(1, $num_updated, 'Updated 1 record.');
 
     $saved_name = db_query('SELECT name FROM {test} WHERE id = :id', [':id' => 42])->fetchField();
-    $this->assertIdentical($saved_name, 'John', 'Updated primary key successfully.');
+    $this->assertSame('John', $saved_name, 'Updated primary key successfully.');
   }
 
   /**
@@ -149,10 +149,10 @@ public function testSpecialColumnUpdate() {
       ->fields(['offset' => 'New offset value'])
       ->condition('id', 1)
       ->execute();
-    $this->assertIdentical($num_updated, 1, 'Updated 1 special column record.');
+    $this->assertSame(1, $num_updated, 'Updated 1 special column record.');
 
     $saved_value = db_query('SELECT "offset" FROM {test_special_columns} WHERE id = :id', [':id' => 1])->fetchField();
-    $this->assertIdentical($saved_value, 'New offset value', 'Updated special column name value successfully.');
+    $this->assertSame('New offset value', $saved_value, 'Updated special column name value successfully.');
   }
 
 }
diff --git a/core/tests/Drupal/KernelTests/Core/DrupalKernel/DrupalKernelSiteTest.php b/core/tests/Drupal/KernelTests/Core/DrupalKernel/DrupalKernelSiteTest.php
index deea2a9..4252d5b 100644
--- a/core/tests/Drupal/KernelTests/Core/DrupalKernel/DrupalKernelSiteTest.php
+++ b/core/tests/Drupal/KernelTests/Core/DrupalKernel/DrupalKernelSiteTest.php
@@ -23,7 +23,7 @@ public function testServicesYml() {
     // A service provider class always has precedence over services.yml files.
     // KernelTestBase::buildContainer() swaps out many services with in-memory
     // implementations already, so those cannot be tested.
-    $this->assertIdentical(get_class($this->container->get('cache.backend.database')), 'Drupal\Core\Cache\DatabaseBackendFactory');
+    $this->assertSame('Drupal\Core\Cache\DatabaseBackendFactory', get_class($this->container->get('cache.backend.database')));
 
     $class = __CLASS__;
     $doc = <<<EOD
@@ -41,7 +41,7 @@ class: Drupal\Core\Cache\MemoryBackendFactory
     $this->container->get('kernel')->rebuildContainer();
 
     $this->assertTrue($this->container->has('site.service.yml'));
-    $this->assertIdentical(get_class($this->container->get('cache.backend.database')), 'Drupal\Core\Cache\MemoryBackendFactory');
+    $this->assertSame('Drupal\Core\Cache\MemoryBackendFactory', get_class($this->container->get('cache.backend.database')));
   }
 
 }
diff --git a/core/tests/Drupal/KernelTests/Core/DrupalKernel/DrupalKernelTest.php b/core/tests/Drupal/KernelTests/Core/DrupalKernel/DrupalKernelTest.php
index 722bdd2..b5cb96b 100644
--- a/core/tests/Drupal/KernelTests/Core/DrupalKernel/DrupalKernelTest.php
+++ b/core/tests/Drupal/KernelTests/Core/DrupalKernel/DrupalKernelTest.php
@@ -137,7 +137,7 @@ public function testCompileDIC() {
     // Check that the container itself is not among the persist IDs because it
     // does not make sense to persist the container itself.
     $persist_ids = $container->getParameter('persist_ids');
-    $this->assertIdentical(FALSE, array_search('service_container', $persist_ids));
+    $this->assertSame(FALSE, array_search('service_container', $persist_ids));
   }
 
   /**
diff --git a/core/tests/Drupal/KernelTests/Core/Entity/ConfigEntityQueryTest.php b/core/tests/Drupal/KernelTests/Core/Entity/ConfigEntityQueryTest.php
index 87ba104..c7e001b 100644
--- a/core/tests/Drupal/KernelTests/Core/Entity/ConfigEntityQueryTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Entity/ConfigEntityQueryTest.php
@@ -403,7 +403,7 @@ public function testCount() {
     $count = $this->factory->get('config_query_test')
       ->count()
       ->execute();
-    $this->assertIdentical($count, count($this->entities));
+    $this->assertSame($count, count($this->entities));
 
     // Test count on a complex query.
     $query = $this->factory->get('config_query_test', 'OR');
@@ -418,7 +418,7 @@ public function testCount() {
       ->condition($and_condition_2)
       ->count()
       ->execute();
-    $this->assertIdentical($count, 2);
+    $this->assertSame(2, $count);
   }
 
   /**
@@ -429,52 +429,52 @@ public function testSortRange() {
     $this->queryResults = $this->factory->get('config_query_test')
       ->sort('number', 'DESC')
       ->execute();
-    $this->assertIdentical(array_values($this->queryResults), ['3', '5', '2', '1', '4']);
+    $this->assertSame(['3', '5', '2', '1', '4'], array_values($this->queryResults));
 
     $this->queryResults = $this->factory->get('config_query_test')
       ->sort('number', 'ASC')
       ->execute();
-    $this->assertIdentical(array_values($this->queryResults), ['4', '1', '2', '5', '3']);
+    $this->assertSame(['4', '1', '2', '5', '3'], array_values($this->queryResults));
 
     // Apply some filters and sort.
     $this->queryResults = $this->factory->get('config_query_test')
       ->condition('id', '3', '>')
       ->sort('number', 'DESC')
       ->execute();
-    $this->assertIdentical(array_values($this->queryResults), ['5', '4']);
+    $this->assertSame(['5', '4'], array_values($this->queryResults));
 
     $this->queryResults = $this->factory->get('config_query_test')
       ->condition('id', '3', '>')
       ->sort('number', 'ASC')
       ->execute();
-    $this->assertIdentical(array_values($this->queryResults), ['4', '5']);
+    $this->assertSame(['4', '5'], array_values($this->queryResults));
 
     // Apply a pager and sort.
     $this->queryResults = $this->factory->get('config_query_test')
       ->sort('number', 'DESC')
       ->range('2', '2')
       ->execute();
-    $this->assertIdentical(array_values($this->queryResults), ['2', '1']);
+    $this->assertSame(['2', '1'], array_values($this->queryResults));
 
     $this->queryResults = $this->factory->get('config_query_test')
       ->sort('number', 'ASC')
       ->range('2', '2')
       ->execute();
-    $this->assertIdentical(array_values($this->queryResults), ['2', '5']);
+    $this->assertSame(['2', '5'], array_values($this->queryResults));
 
     // Add a range to a query without a start parameter.
     $this->queryResults = $this->factory->get('config_query_test')
       ->range(0, '3')
       ->sort('id', 'ASC')
       ->execute();
-    $this->assertIdentical(array_values($this->queryResults), ['1', '2', '3']);
+    $this->assertSame(['1', '2', '3'], array_values($this->queryResults));
 
     // Apply a pager with limit 4.
     $this->queryResults = $this->factory->get('config_query_test')
       ->pager('4', 0)
       ->sort('id', 'ASC')
       ->execute();
-    $this->assertIdentical(array_values($this->queryResults), ['1', '2', '3', '4']);
+    $this->assertSame(['1', '2', '3', '4'], array_values($this->queryResults));
   }
 
   /**
@@ -492,28 +492,28 @@ public function testTableSort() {
       ->tableSort($header)
       ->sort('id', 'DESC')
       ->execute();
-    $this->assertIdentical(array_values($this->queryResults), ['5', '4', '3', '2', '1']);
+    $this->assertSame(['5', '4', '3', '2', '1'], array_values($this->queryResults));
 
     // Sorting with 'ASC' upper case
     $this->queryResults = $this->factory->get('config_query_test')
       ->tableSort($header)
       ->sort('id', 'ASC')
       ->execute();
-    $this->assertIdentical(array_values($this->queryResults), ['1', '2', '3', '4', '5']);
+    $this->assertSame(['1', '2', '3', '4', '5'], array_values($this->queryResults));
 
     // Sorting with 'desc' lower case
     $this->queryResults = $this->factory->get('config_query_test')
       ->tableSort($header)
       ->sort('id', 'desc')
       ->execute();
-    $this->assertIdentical(array_values($this->queryResults), ['5', '4', '3', '2', '1']);
+    $this->assertSame(['5', '4', '3', '2', '1'], array_values($this->queryResults));
 
     // Sorting with 'asc' lower case
     $this->queryResults = $this->factory->get('config_query_test')
       ->tableSort($header)
       ->sort('id', 'asc')
       ->execute();
-    $this->assertIdentical(array_values($this->queryResults), ['1', '2', '3', '4', '5']);
+    $this->assertSame(['1', '2', '3', '4', '5'], array_values($this->queryResults));
 
     // Sort key: number
     // Sorting with 'DeSc' mixed upper and lower case
@@ -521,28 +521,28 @@ public function testTableSort() {
       ->tableSort($header)
       ->sort('number', 'DeSc')
       ->execute();
-    $this->assertIdentical(array_values($this->queryResults), ['3', '5', '2', '1', '4']);
+    $this->assertSame(['3', '5', '2', '1', '4'], array_values($this->queryResults));
 
     // Sorting with 'AsC' mixed upper and lower case
     $this->queryResults = $this->factory->get('config_query_test')
       ->tableSort($header)
       ->sort('number', 'AsC')
       ->execute();
-    $this->assertIdentical(array_values($this->queryResults), ['4', '1', '2', '5', '3']);
+    $this->assertSame(['4', '1', '2', '5', '3'], array_values($this->queryResults));
 
     // Sorting with 'dEsC' mixed upper and lower case
     $this->queryResults = $this->factory->get('config_query_test')
       ->tableSort($header)
       ->sort('number', 'dEsC')
       ->execute();
-    $this->assertIdentical(array_values($this->queryResults), ['3', '5', '2', '1', '4']);
+    $this->assertSame(['3', '5', '2', '1', '4'], array_values($this->queryResults));
 
     // Sorting with 'aSc' mixed upper and lower case
     $this->queryResults = $this->factory->get('config_query_test')
       ->tableSort($header)
       ->sort('number', 'aSc')
       ->execute();
-    $this->assertIdentical(array_values($this->queryResults), ['4', '1', '2', '5', '3']);
+    $this->assertSame(['4', '1', '2', '5', '3'], array_values($this->queryResults));
   }
 
   /**
@@ -655,10 +655,10 @@ public function testLookupKeys() {
    *   Array of expected entity IDs.
    */
   protected function assertResults($expected) {
-    $this->assertIdentical(count($this->queryResults), count($expected));
+    $this->assertSame(count($expected), count($this->queryResults));
     foreach ($expected as $value) {
       // This also tests whether $this->queryResults[$value] is even set at all.
-      $this->assertIdentical($this->queryResults[$value], $value);
+      $this->assertSame($value, $this->queryResults[$value]);
     }
   }
 
diff --git a/core/tests/Drupal/KernelTests/Core/Entity/ContentEntityNullStorageTest.php b/core/tests/Drupal/KernelTests/Core/Entity/ContentEntityNullStorageTest.php
index 697f1be..6da9bb3 100644
--- a/core/tests/Drupal/KernelTests/Core/Entity/ContentEntityNullStorageTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Entity/ContentEntityNullStorageTest.php
@@ -30,10 +30,10 @@ class ContentEntityNullStorageTest extends KernelTestBase {
    * @see \Drupal\Core\Entity\Query\Null\Query
    */
   public function testEntityQuery() {
-    $this->assertIdentical(0, \Drupal::entityQuery('contact_message')->count()->execute(), 'Counting a null storage returns 0.');
-    $this->assertIdentical([], \Drupal::entityQuery('contact_message')->execute(), 'Querying a null storage returns an empty array.');
-    $this->assertIdentical([], \Drupal::entityQuery('contact_message')->condition('contact_form', 'test')->execute(), 'Querying a null storage returns an empty array and conditions are ignored.');
-    $this->assertIdentical([], \Drupal::entityQueryAggregate('contact_message')->aggregate('name', 'AVG')->execute(), 'Aggregate querying a null storage returns an empty array');
+    $this->assertSame(0, \Drupal::entityQuery('contact_message')->count()->execute(), 'Counting a null storage returns 0.');
+    $this->assertSame([], \Drupal::entityQuery('contact_message')->execute(), 'Querying a null storage returns an empty array.');
+    $this->assertSame([], \Drupal::entityQuery('contact_message')->condition('contact_form', 'test')->execute(), 'Querying a null storage returns an empty array and conditions are ignored.');
+    $this->assertSame([], \Drupal::entityQueryAggregate('contact_message')->aggregate('name', 'AVG')->execute(), 'Aggregate querying a null storage returns an empty array');
 
   }
 
diff --git a/core/tests/Drupal/KernelTests/Core/Entity/EntityAccessControlHandlerTest.php b/core/tests/Drupal/KernelTests/Core/Entity/EntityAccessControlHandlerTest.php
index d7644b2..68e2f45 100644
--- a/core/tests/Drupal/KernelTests/Core/Entity/EntityAccessControlHandlerTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Entity/EntityAccessControlHandlerTest.php
@@ -211,10 +211,10 @@ public function testHooks() {
     // Test hook_entity_create_access() and hook_ENTITY_TYPE_create_access().
     $entity->access('create');
     $this->assertEqual($state->get('entity_test_entity_create_access'), TRUE);
-    $this->assertIdentical($state->get('entity_test_entity_create_access_context'), [
+    $this->assertSame([
       'entity_type_id' => 'entity_test',
       'langcode' => LanguageInterface::LANGCODE_DEFAULT,
-    ]);
+    ], $state->get('entity_test_entity_create_access_context'));
     $this->assertEqual($state->get('entity_test_entity_test_create_access'), TRUE);
 
     // Test hook_entity_access() and hook_ENTITY_TYPE_access().
diff --git a/core/tests/Drupal/KernelTests/Core/Entity/EntityAutocompleteTest.php b/core/tests/Drupal/KernelTests/Core/Entity/EntityAutocompleteTest.php
index ca65eb8..c8fc036 100644
--- a/core/tests/Drupal/KernelTests/Core/Entity/EntityAutocompleteTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Entity/EntityAutocompleteTest.php
@@ -66,8 +66,8 @@ public function testEntityReferenceAutocompletion() {
     // We should get both entities in a JSON encoded string.
     $input = '10/';
     $data = $this->getAutocompleteResult($input);
-    $this->assertIdentical($data[0]['label'], Html::escape($entity_1->name->value), 'Autocomplete returned the first matching entity');
-    $this->assertIdentical($data[1]['label'], Html::escape($entity_2->name->value), 'Autocomplete returned the second matching entity');
+    $this->assertSame($data[0]['label'], Html::escape($entity_1->name->value), 'Autocomplete returned the first matching entity');
+    $this->assertSame($data[1]['label'], Html::escape($entity_2->name->value), 'Autocomplete returned the second matching entity');
 
     // Try to autocomplete a entity label that matches the first entity.
     // We should only get the first entity in a JSON encoded string.
@@ -77,13 +77,13 @@ public function testEntityReferenceAutocompletion() {
       'value' => $entity_1->name->value . ' (1)',
       'label' => Html::escape($entity_1->name->value),
     ];
-    $this->assertIdentical(reset($data), $target, 'Autocomplete returns only the expected matching entity.');
+    $this->assertSame(reset($data), $target, 'Autocomplete returns only the expected matching entity.');
 
     // Try to autocomplete a entity label that matches the second entity, and
     // the first entity  is already typed in the autocomplete (tags) widget.
     $input = $entity_1->name->value . ' (1), 10/17';
     $data = $this->getAutocompleteResult($input);
-    $this->assertIdentical($data[0]['label'], Html::escape($entity_2->name->value), 'Autocomplete returned the second matching entity');
+    $this->assertSame($data[0]['label'], Html::escape($entity_2->name->value), 'Autocomplete returned the second matching entity');
 
     // Try to autocomplete a entity label with both a comma, a slash and markup.
     $input = '"label with, and /"';
@@ -95,7 +95,7 @@ public function testEntityReferenceAutocompletion() {
       'value' => $n,
       'label' => Html::escape($entity_3->name->value),
     ];
-    $this->assertIdentical(reset($data), $target, 'Autocomplete returns an entity label containing a comma and a slash.');
+    $this->assertSame(reset($data), $target, 'Autocomplete returns an entity label containing a comma and a slash.');
   }
 
   /**
diff --git a/core/tests/Drupal/KernelTests/Core/Entity/EntityDefinitionUpdateTest.php b/core/tests/Drupal/KernelTests/Core/Entity/EntityDefinitionUpdateTest.php
index 646ad2e..7caa70a 100644
--- a/core/tests/Drupal/KernelTests/Core/Entity/EntityDefinitionUpdateTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Entity/EntityDefinitionUpdateTest.php
@@ -87,7 +87,7 @@ public function testNewEntityType() {
   public function testNoUpdates() {
     // Ensure that the definition update manager reports no updates.
     $this->assertFalse($this->entityDefinitionUpdateManager->needsUpdates(), 'EntityDefinitionUpdateManager reports that no updates are needed.');
-    $this->assertIdentical($this->entityDefinitionUpdateManager->getChangeSummary(), [], 'EntityDefinitionUpdateManager reports an empty change summary.');
+    $this->assertSame([], $this->entityDefinitionUpdateManager->getChangeSummary(), 'EntityDefinitionUpdateManager reports an empty change summary.');
 
     // Ensure that applyUpdates() runs without error (it's not expected to do
     // anything when there aren't updates).
@@ -281,7 +281,7 @@ public function testBaseFieldCreateDeleteWithExistingEntities() {
     $schema_handler = $this->database->schema();
     $this->assertTrue($schema_handler->fieldExists('entity_test_update', 'new_base_field'), 'Column created in shared table for new_base_field.');
     $entity = $this->entityManager->getStorage('entity_test_update')->load($entity->id());
-    $this->assertIdentical($entity->name->value, $name, 'Entity data preserved during field creation.');
+    $this->assertSame($name, $entity->name->value, 'Entity data preserved during field creation.');
 
     // Remove the base field and run the update. Ensure the base field's column
     // is deleted and the prior saved entity data is still there.
@@ -289,7 +289,7 @@ public function testBaseFieldCreateDeleteWithExistingEntities() {
     $this->entityDefinitionUpdateManager->applyUpdates();
     $this->assertFalse($schema_handler->fieldExists('entity_test_update', 'new_base_field'), 'Column deleted from shared table for new_base_field.');
     $entity = $this->entityManager->getStorage('entity_test_update')->load($entity->id());
-    $this->assertIdentical($entity->name->value, $name, 'Entity data preserved during field deletion.');
+    $this->assertSame($name, $entity->name->value, 'Entity data preserved during field deletion.');
 
     // Add a base field with a required property and run the update. Ensure
     // 'not null' is not applied and thus no exception is thrown.
@@ -338,7 +338,7 @@ public function testBundleFieldCreateDeleteWithExistingEntities() {
     $schema_handler = $this->database->schema();
     $this->assertTrue($schema_handler->tableExists('entity_test_update__new_bundle_field'), 'Dedicated table created for new_bundle_field.');
     $entity = $this->entityManager->getStorage('entity_test_update')->load($entity->id());
-    $this->assertIdentical($entity->name->value, $name, 'Entity data preserved during field creation.');
+    $this->assertSame($name, $entity->name->value, 'Entity data preserved during field creation.');
 
     // Remove the base field and run the update. Ensure the bundle field's
     // table is deleted and the prior saved entity data is still there.
@@ -346,7 +346,7 @@ public function testBundleFieldCreateDeleteWithExistingEntities() {
     $this->entityDefinitionUpdateManager->applyUpdates();
     $this->assertFalse($schema_handler->tableExists('entity_test_update__new_bundle_field'), 'Dedicated table deleted for new_bundle_field.');
     $entity = $this->entityManager->getStorage('entity_test_update')->load($entity->id());
-    $this->assertIdentical($entity->name->value, $name, 'Entity data preserved during field deletion.');
+    $this->assertSame($name, $entity->name->value, 'Entity data preserved during field deletion.');
 
     // Test that required columns are created as 'not null'.
     $this->addBundleField('shape_required');
diff --git a/core/tests/Drupal/KernelTests/Core/Entity/EntityFieldTest.php b/core/tests/Drupal/KernelTests/Core/Entity/EntityFieldTest.php
index e0bf655..4376b36 100644
--- a/core/tests/Drupal/KernelTests/Core/Entity/EntityFieldTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Entity/EntityFieldTest.php
@@ -223,8 +223,8 @@ protected function doTestReadWrite($entity_type) {
       }
       $this->assertTrue(isset($entity->name), format_string('%entity_type: Name field is set.', ['%entity_type' => $entity_type]));
       $this->assertTrue($entity->name->isEmpty(), format_string('%entity_type: Name field is set.', ['%entity_type' => $entity_type]));
-      $this->assertIdentical(count($entity->name), 0, format_string('%entity_type: Name field contains no items.', ['%entity_type' => $entity_type]));
-      $this->assertIdentical($entity->name->getValue(), [], format_string('%entity_type: Name field value is an empty array.', ['%entity_type' => $entity_type]));
+      $this->assertSame(0, count($entity->name), format_string('%entity_type: Name field contains no items.', ['%entity_type' => $entity_type]));
+      $this->assertSame([], $entity->name->getValue(), format_string('%entity_type: Name field value is an empty array.', ['%entity_type' => $entity_type]));
       $this->assertFalse(isset($entity->name[0]), format_string('%entity_type: Name field item is not set.', ['%entity_type' => $entity_type]));
       $this->assertFalse(isset($entity->name[0]->value), format_string('%entity_type: First name item value is not set.', ['%entity_type' => $entity_type]));
       $this->assertFalse(isset($entity->name->value), format_string('%entity_type: Name value is not set.', ['%entity_type' => $entity_type]));
@@ -342,7 +342,7 @@ protected function doTestReadWrite($entity_type) {
         'field_test_text' => $text_item,
       ]);
     $this->assertNotNull($entity->user_id->target_id, format_string('%entity_type: User id is not NULL', ['%entity_type' => $entity_type]));
-    $this->assertIdentical($entity->user_id->target_id, 0, format_string('%entity_type: User id has been set to 0', ['%entity_type' => $entity_type]));
+    $this->assertSame(0, $entity->user_id->target_id, format_string('%entity_type: User id has been set to 0', ['%entity_type' => $entity_type]));
 
     // Test setting the ID with the value only.
     $entity = $this->container->get('entity_type.manager')
@@ -353,7 +353,7 @@ protected function doTestReadWrite($entity_type) {
         'field_test_text' => $text_item,
       ]);
     $this->assertNotNull($entity->user_id->target_id, format_string('%entity_type: User id is not NULL', ['%entity_type' => $entity_type]));
-    $this->assertIdentical($entity->user_id->target_id, 0, format_string('%entity_type: User id has been set to 0', ['%entity_type' => $entity_type]));
+    $this->assertSame(0, $entity->user_id->target_id, format_string('%entity_type: User id has been set to 0', ['%entity_type' => $entity_type]));
   }
 
   /**
@@ -471,30 +471,30 @@ protected function doTestIntrospection($entity_type) {
 
     // Make sure provided contextual information is right.
     $entity_adapter = $entity->getTypedData();
-    $this->assertIdentical($entity_adapter->getRoot(), $entity_adapter, 'Entity is root object.');
+    $this->assertSame($entity_adapter->getRoot(), $entity_adapter, 'Entity is root object.');
     $this->assertEqual($entity_adapter->getPropertyPath(), '');
     $this->assertEqual($entity_adapter->getName(), '');
     $this->assertEqual($entity_adapter->getParent(), NULL);
 
     $field = $entity->user_id;
-    $this->assertIdentical($field->getRoot()->getValue(), $entity, 'Entity is root object.');
-    $this->assertIdentical($field->getEntity(), $entity, 'getEntity() returns the entity.');
+    $this->assertSame($field->getRoot()->getValue(), $entity, 'Entity is root object.');
+    $this->assertSame($field->getEntity(), $entity, 'getEntity() returns the entity.');
     $this->assertEqual($field->getPropertyPath(), 'user_id');
     $this->assertEqual($field->getName(), 'user_id');
-    $this->assertIdentical($field->getParent()->getValue(), $entity, 'Parent object matches.');
+    $this->assertSame($field->getParent()->getValue(), $entity, 'Parent object matches.');
 
     $field_item = $field[0];
-    $this->assertIdentical($field_item->getRoot()->getValue(), $entity, 'Entity is root object.');
-    $this->assertIdentical($field_item->getEntity(), $entity, 'getEntity() returns the entity.');
+    $this->assertSame($field_item->getRoot()->getValue(), $entity, 'Entity is root object.');
+    $this->assertSame($field_item->getEntity(), $entity, 'getEntity() returns the entity.');
     $this->assertEqual($field_item->getPropertyPath(), 'user_id.0');
     $this->assertEqual($field_item->getName(), '0');
-    $this->assertIdentical($field_item->getParent(), $field, 'Parent object matches.');
+    $this->assertSame($field_item->getParent(), $field, 'Parent object matches.');
 
     $item_value = $field_item->get('entity');
-    $this->assertIdentical($item_value->getRoot()->getValue(), $entity, 'Entity is root object.');
+    $this->assertSame($item_value->getRoot()->getValue(), $entity, 'Entity is root object.');
     $this->assertEqual($item_value->getPropertyPath(), 'user_id.0.entity');
     $this->assertEqual($item_value->getName(), 'entity');
-    $this->assertIdentical($item_value->getParent(), $field_item, 'Parent object matches.');
+    $this->assertSame($item_value->getParent(), $field_item, 'Parent object matches.');
   }
 
   /**
diff --git a/core/tests/Drupal/KernelTests/Core/Entity/EntityQueryTest.php b/core/tests/Drupal/KernelTests/Core/Entity/EntityQueryTest.php
index 5c7e51c..d480ec5 100644
--- a/core/tests/Drupal/KernelTests/Core/Entity/EntityQueryTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Entity/EntityQueryTest.php
@@ -287,21 +287,21 @@ public function testEntityQuery() {
     // This matches both the original and new current revisions, multiple
     // revisions are returned for some entities.
     $assert = [16 => '4', 17 => '5', 18 => '6', 19 => '7', 8 => '8', 9 => '9', 10 => '10', 11 => '11', 20 => '12', 21 => '13', 22 => '14', 23 => '15'];
-    $this->assertIdentical($results, $assert);
+    $this->assertSame($assert, $results);
     $results = $this->factory->get('entity_test_mulrev')
       ->condition("$greetings.value", 'siema', 'STARTS_WITH')
       ->sort('revision_id')
       ->execute();
     // Now we only get the ones that originally were siema, entity id 8 and
     // above.
-    $this->assertIdentical($results, array_slice($assert, 4, 8, TRUE));
+    $this->assertSame(array_slice($assert, 4, 8, TRUE), $results);
     $results = $this->factory->get('entity_test_mulrev')
       ->condition("$greetings.value", 'a', 'ENDS_WITH')
       ->sort('revision_id')
       ->execute();
     // It is very important that we do not get the ones which only have
     // xsiemax despite originally they were merhaba, ie. ended with a.
-    $this->assertIdentical($results, array_slice($assert, 4, 8, TRUE));
+    $this->assertSame(array_slice($assert, 4, 8, TRUE), $results);
     $results = $this->factory->get('entity_test_mulrev')
       ->condition("$greetings.value", 'a', 'ENDS_WITH')
       ->allRevisions()
@@ -310,7 +310,7 @@ public function testEntityQuery() {
       ->execute();
     // Now we get everything.
     $assert = [4 => '4', 5 => '5', 6 => '6', 7 => '7', 8 => '8', 9 => '9', 10 => '10', 11 => '11', 12 => '12', 20 => '12', 13 => '13', 21 => '13', 14 => '14', 22 => '14', 15 => '15', 23 => '15'];
-    $this->assertIdentical($results, $assert);
+    $this->assertSame($assert, $results);
   }
 
   /**
@@ -604,7 +604,7 @@ protected function assertResult() {
     foreach ($expected as $binary) {
       $assert[$binary] = strval($binary);
     }
-    $this->assertIdentical($this->queryResults, $assert);
+    $this->assertSame($assert, $this->queryResults);
   }
 
   protected function assertRevisionResult($keys, $expected) {
@@ -612,7 +612,7 @@ protected function assertRevisionResult($keys, $expected) {
     foreach ($expected as $key => $binary) {
       $assert[$keys[$key]] = strval($binary);
     }
-    $this->assertIdentical($this->queryResults, $assert);
+    $this->assertSame($assert, $this->queryResults);
     return $assert;
   }
 
@@ -720,110 +720,110 @@ public function testCaseSensitivity() {
     $result = \Drupal::entityQuery('entity_test_mulrev')->condition(
       'field_ci', $fixtures[0]['lowercase'] . $fixtures[1]['lowercase']
     )->execute();
-    $this->assertIdentical(count($result), 1, 'Case insensitive, lowercase');
+    $this->assertSame(1, count($result), 'Case insensitive, lowercase');
 
     $result = \Drupal::entityQuery('entity_test_mulrev')->condition(
       'field_ci', $fixtures[0]['uppercase'] . $fixtures[1]['uppercase']
     )->execute();
-    $this->assertIdentical(count($result), 1, 'Case insensitive, uppercase');
+    $this->assertSame(1, count($result), 'Case insensitive, uppercase');
 
     $result = \Drupal::entityQuery('entity_test_mulrev')->condition(
       'field_ci', $fixtures[0]['uppercase'] . $fixtures[1]['lowercase']
     )->execute();
-    $this->assertIdentical(count($result), 1, 'Case insensitive, mixed.');
+    $this->assertSame(1, count($result), 'Case insensitive, mixed.');
 
     // Check the case sensitive field, = operator.
     $result = \Drupal::entityQuery('entity_test_mulrev')->condition(
       'field_cs', $fixtures[0]['lowercase'] . $fixtures[1]['lowercase']
     )->execute();
-    $this->assertIdentical(count($result), 0, 'Case sensitive, lowercase.');
+    $this->assertSame(0, count($result), 'Case sensitive, lowercase.');
 
     $result = \Drupal::entityQuery('entity_test_mulrev')->condition(
       'field_cs', $fixtures[0]['uppercase'] . $fixtures[1]['uppercase']
     )->execute();
-    $this->assertIdentical(count($result), 0, 'Case sensitive, uppercase.');
+    $this->assertSame(0, count($result), 'Case sensitive, uppercase.');
 
     $result = \Drupal::entityQuery('entity_test_mulrev')->condition(
       'field_cs', $fixtures[0]['uppercase'] . $fixtures[1]['lowercase']
     )->execute();
-    $this->assertIdentical(count($result), 1, 'Case sensitive, exact match.');
+    $this->assertSame(1, count($result), 'Case sensitive, exact match.');
 
     // Check the case insensitive field, IN operator.
     $result = \Drupal::entityQuery('entity_test_mulrev')->condition(
       'field_ci', [$fixtures[0]['lowercase'] . $fixtures[1]['lowercase']], 'IN'
     )->execute();
-    $this->assertIdentical(count($result), 1, 'Case insensitive, lowercase');
+    $this->assertSame(1, count($result), 'Case insensitive, lowercase');
 
     $result = \Drupal::entityQuery('entity_test_mulrev')->condition(
       'field_ci', [$fixtures[0]['uppercase'] . $fixtures[1]['uppercase']], 'IN'
     )->execute();
-    $this->assertIdentical(count($result), 1, 'Case insensitive, uppercase');
+    $this->assertSame(1, count($result), 'Case insensitive, uppercase');
 
     $result = \Drupal::entityQuery('entity_test_mulrev')->condition(
       'field_ci', [$fixtures[0]['uppercase'] . $fixtures[1]['lowercase']], 'IN'
     )->execute();
-    $this->assertIdentical(count($result), 1, 'Case insensitive, mixed');
+    $this->assertSame(1, count($result), 'Case insensitive, mixed');
 
     // Check the case sensitive field, IN operator.
     $result = \Drupal::entityQuery('entity_test_mulrev')->condition(
       'field_cs', [$fixtures[0]['lowercase'] . $fixtures[1]['lowercase']], 'IN'
     )->execute();
-    $this->assertIdentical(count($result), 0, 'Case sensitive, lowercase');
+    $this->assertSame(0, count($result), 'Case sensitive, lowercase');
 
     $result = \Drupal::entityQuery('entity_test_mulrev')->condition(
       'field_cs', [$fixtures[0]['uppercase'] . $fixtures[1]['uppercase']], 'IN'
     )->execute();
-    $this->assertIdentical(count($result), 0, 'Case sensitive, uppercase');
+    $this->assertSame(0, count($result), 'Case sensitive, uppercase');
 
     $result = \Drupal::entityQuery('entity_test_mulrev')->condition(
       'field_cs', [$fixtures[0]['uppercase'] . $fixtures[1]['lowercase']], 'IN'
     )->execute();
-    $this->assertIdentical(count($result), 1, 'Case sensitive, mixed');
+    $this->assertSame(1, count($result), 'Case sensitive, mixed');
 
     // Check the case insensitive field, STARTS_WITH operator.
     $result = \Drupal::entityQuery('entity_test_mulrev')->condition(
       'field_ci', $fixtures[0]['lowercase'], 'STARTS_WITH'
     )->execute();
-    $this->assertIdentical(count($result), 1, 'Case sensitive, lowercase.');
+    $this->assertSame(1, count($result), 'Case sensitive, lowercase.');
 
     $result = \Drupal::entityQuery('entity_test_mulrev')->condition(
       'field_ci', $fixtures[0]['uppercase'], 'STARTS_WITH'
     )->execute();
-    $this->assertIdentical(count($result), 1, 'Case sensitive, exact match.');
+    $this->assertSame(1, count($result), 'Case sensitive, exact match.');
 
     // Check the case sensitive field, STARTS_WITH operator.
     $result = \Drupal::entityQuery('entity_test_mulrev')->condition(
       'field_cs', $fixtures[0]['lowercase'], 'STARTS_WITH'
     )->execute();
-    $this->assertIdentical(count($result), 0, 'Case sensitive, lowercase.');
+    $this->assertSame(0, count($result), 'Case sensitive, lowercase.');
 
     $result = \Drupal::entityQuery('entity_test_mulrev')->condition(
       'field_cs', $fixtures[0]['uppercase'], 'STARTS_WITH'
     )->execute();
-    $this->assertIdentical(count($result), 1, 'Case sensitive, exact match.');
+    $this->assertSame(1, count($result), 'Case sensitive, exact match.');
 
 
     // Check the case insensitive field, ENDS_WITH operator.
     $result = \Drupal::entityQuery('entity_test_mulrev')->condition(
       'field_ci', $fixtures[1]['lowercase'], 'ENDS_WITH'
     )->execute();
-    $this->assertIdentical(count($result), 1, 'Case sensitive, lowercase.');
+    $this->assertSame(1, count($result), 'Case sensitive, lowercase.');
 
     $result = \Drupal::entityQuery('entity_test_mulrev')->condition(
       'field_ci', $fixtures[1]['uppercase'], 'ENDS_WITH'
     )->execute();
-    $this->assertIdentical(count($result), 1, 'Case sensitive, exact match.');
+    $this->assertSame(1, count($result), 'Case sensitive, exact match.');
 
     // Check the case sensitive field, ENDS_WITH operator.
     $result = \Drupal::entityQuery('entity_test_mulrev')->condition(
       'field_cs', $fixtures[1]['lowercase'], 'ENDS_WITH'
     )->execute();
-    $this->assertIdentical(count($result), 1, 'Case sensitive, lowercase.');
+    $this->assertSame(1, count($result), 'Case sensitive, lowercase.');
 
     $result = \Drupal::entityQuery('entity_test_mulrev')->condition(
       'field_cs', $fixtures[1]['uppercase'], 'ENDS_WITH'
     )->execute();
-    $this->assertIdentical(count($result), 0, 'Case sensitive, exact match.');
+    $this->assertSame(0, count($result), 'Case sensitive, exact match.');
 
 
     // Check the case insensitive field, CONTAINS operator, use the inner 8
@@ -831,23 +831,23 @@ public function testCaseSensitivity() {
     $result = \Drupal::entityQuery('entity_test_mulrev')->condition(
       'field_ci', Unicode::substr($fixtures[0]['uppercase'] . $fixtures[1]['lowercase'], 4, 8), 'CONTAINS'
     )->execute();
-    $this->assertIdentical(count($result), 1, 'Case sensitive, lowercase.');
+    $this->assertSame(1, count($result), 'Case sensitive, lowercase.');
 
     $result = \Drupal::entityQuery('entity_test_mulrev')->condition(
       'field_ci', Unicode::strtolower(Unicode::substr($fixtures[0]['uppercase'] . $fixtures[1]['lowercase'], 4, 8)), 'CONTAINS'
     )->execute();
-    $this->assertIdentical(count($result), 1, 'Case sensitive, exact match.');
+    $this->assertSame(1, count($result), 'Case sensitive, exact match.');
 
     // Check the case sensitive field, CONTAINS operator.
     $result = \Drupal::entityQuery('entity_test_mulrev')->condition(
       'field_cs', Unicode::substr($fixtures[0]['uppercase'] . $fixtures[1]['lowercase'], 4, 8), 'CONTAINS'
     )->execute();
-    $this->assertIdentical(count($result), 1, 'Case sensitive, lowercase.');
+    $this->assertSame(1, count($result), 'Case sensitive, lowercase.');
 
     $result = \Drupal::entityQuery('entity_test_mulrev')->condition(
       'field_cs', Unicode::strtolower(Unicode::substr($fixtures[0]['uppercase'] . $fixtures[1]['lowercase'], 4, 8)), 'CONTAINS'
     )->execute();
-    $this->assertIdentical(count($result), 0, 'Case sensitive, exact match.');
+    $this->assertSame(0, count($result), 'Case sensitive, exact match.');
 
   }
 
diff --git a/core/tests/Drupal/KernelTests/Core/Entity/EntityReferenceSelection/EntityReferenceSelectionSortTest.php b/core/tests/Drupal/KernelTests/Core/Entity/EntityReferenceSelection/EntityReferenceSelectionSortTest.php
index eb13d0e..62b44e6 100644
--- a/core/tests/Drupal/KernelTests/Core/Entity/EntityReferenceSelection/EntityReferenceSelectionSortTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Entity/EntityReferenceSelection/EntityReferenceSelectionSortTest.php
@@ -114,7 +114,7 @@ public function testSort() {
       $nodes['published2']->id() => $node_labels['published2'],
       $nodes['published1']->id() => $node_labels['published1'],
     ];
-    $this->assertIdentical($result['article'], $expected_result, 'Query sorted by field returned expected values.');
+    $this->assertSame($expected_result, $result['article'], 'Query sorted by field returned expected values.');
 
     // Assert sort by base field.
     $selection_options['handler_settings']['sort'] = [
@@ -127,7 +127,7 @@ public function testSort() {
       $nodes['published1']->id() => $node_labels['published1'],
       $nodes['published2']->id() => $node_labels['published2'],
     ];
-    $this->assertIdentical($result['article'], $expected_result, 'Query sorted by property returned expected values.');
+    $this->assertSame($expected_result, $result['article'], 'Query sorted by property returned expected values.');
   }
 
 }
diff --git a/core/tests/Drupal/KernelTests/Core/Entity/EntityTranslationTest.php b/core/tests/Drupal/KernelTests/Core/Entity/EntityTranslationTest.php
index fe8bcc0..bcd702a 100644
--- a/core/tests/Drupal/KernelTests/Core/Entity/EntityTranslationTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Entity/EntityTranslationTest.php
@@ -341,12 +341,12 @@ protected function doTestEntityTranslationAPI($entity_type) {
     // retrieve a translation referring to it.
     $translation = $entity->getTranslation(LanguageInterface::LANGCODE_NOT_SPECIFIED);
     $this->assertFalse($translation->isNewTranslation(), 'Existing translations are not marked as new.');
-    $this->assertIdentical($entity, $translation, 'The translation object corresponding to a non-default language is the entity object itself when the entity is language-neutral.');
+    $this->assertSame($entity, $translation, 'The translation object corresponding to a non-default language is the entity object itself when the entity is language-neutral.');
     $entity->{$langcode_key}->value = $default_langcode;
     $translation = $entity->getTranslation($default_langcode);
-    $this->assertIdentical($entity, $translation, 'The translation object corresponding to the default language (explicit) is the entity object itself.');
+    $this->assertSame($entity, $translation, 'The translation object corresponding to the default language (explicit) is the entity object itself.');
     $translation = $entity->getTranslation(LanguageInterface::LANGCODE_DEFAULT);
-    $this->assertIdentical($entity, $translation, 'The translation object corresponding to the default language (implicit) is the entity object itself.');
+    $this->assertSame($entity, $translation, 'The translation object corresponding to the default language (implicit) is the entity object itself.');
     $this->assertTrue($entity->{$default_langcode_key}->value, 'The translation object is the default one.');
 
     // Verify that trying to retrieve a translation for a locked language when
@@ -657,7 +657,7 @@ protected function doTestLanguageFallback($entity_type) {
     $translation = $this->entityManager->getTranslationFromContext($entity2, $default_langcode);
     $translation_build = $controller->view($translation);
     $translation_output = (string) $renderer->renderRoot($translation_build);
-    $this->assertIdentical($entity2_output, $translation_output, 'When the entity has no translation no fallback is applied.');
+    $this->assertSame($entity2_output, $translation_output, 'When the entity has no translation no fallback is applied.');
 
     // Checks that entity translations are rendered properly.
     $controller = $this->entityManager->getViewBuilder($entity_type);
diff --git a/core/tests/Drupal/KernelTests/Core/Entity/EntityUUIDTest.php b/core/tests/Drupal/KernelTests/Core/Entity/EntityUUIDTest.php
index a3466a4..ac0c9db 100644
--- a/core/tests/Drupal/KernelTests/Core/Entity/EntityUUIDTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Entity/EntityUUIDTest.php
@@ -46,7 +46,7 @@ protected function assertCRUD($entity_type) {
         'name' => $this->randomMachineName(),
         'uuid' => $uuid,
       ]);
-    $this->assertIdentical($custom_entity->uuid(), $uuid);
+    $this->assertSame($uuid, $custom_entity->uuid());
     // Save this entity, so we have more than one later.
     $custom_entity->save();
 
@@ -62,7 +62,7 @@ protected function assertCRUD($entity_type) {
 
     // Verify that the UUID is retained upon saving.
     $entity->save();
-    $this->assertIdentical($entity->uuid(), $uuid);
+    $this->assertSame($uuid, $entity->uuid());
 
     // Verify that the UUID is retained upon loading.
     /** @var \Drupal\Core\Entity\EntityStorageInterface $storage */
@@ -70,11 +70,11 @@ protected function assertCRUD($entity_type) {
       ->getStorage($entity_type);
     $storage->resetCache([$entity->id()]);
     $entity_loaded = $storage->load($entity->id());
-    $this->assertIdentical($entity_loaded->uuid(), $uuid);
+    $this->assertSame($uuid, $entity_loaded->uuid());
 
     // Verify that \Drupal::entityManager()->loadEntityByUuid() loads the same entity.
     $entity_loaded_by_uuid = \Drupal::entityManager()->loadEntityByUuid($entity_type, $uuid, TRUE);
-    $this->assertIdentical($entity_loaded_by_uuid->uuid(), $uuid);
+    $this->assertSame($uuid, $entity_loaded_by_uuid->uuid());
     $this->assertEqual($entity_loaded_by_uuid->id(), $entity_loaded->id());
 
     // Creating a duplicate needs to result in a new UUID.
diff --git a/core/tests/Drupal/KernelTests/Core/EventSubscriber/IgnoreReplicaSubscriberTest.php b/core/tests/Drupal/KernelTests/Core/EventSubscriber/IgnoreReplicaSubscriberTest.php
index 4206cea..7ce994a 100644
--- a/core/tests/Drupal/KernelTests/Core/EventSubscriber/IgnoreReplicaSubscriberTest.php
+++ b/core/tests/Drupal/KernelTests/Core/EventSubscriber/IgnoreReplicaSubscriberTest.php
@@ -37,7 +37,7 @@ public function testSystemInitIgnoresSecondaries() {
     $db1 = Database::getConnection('default', 'default');
     $db2 = Database::getConnection('replica', 'default');
 
-    $this->assertIdentical($db1, $db2, 'System Init ignores secondaries when requested.');
+    $this->assertSame($db1, $db2, 'System Init ignores secondaries when requested.');
   }
 
 }
diff --git a/core/tests/Drupal/KernelTests/Core/File/HtaccessTest.php b/core/tests/Drupal/KernelTests/Core/File/HtaccessTest.php
index 0c4c1eb..a5b8a5f 100644
--- a/core/tests/Drupal/KernelTests/Core/File/HtaccessTest.php
+++ b/core/tests/Drupal/KernelTests/Core/File/HtaccessTest.php
@@ -82,7 +82,7 @@ public function testHtaccessSave() {
    */
   protected function assertFilePermissions($uri, $expected) {
     $actual = fileperms($uri) & 0777;
-    return $this->assertIdentical($actual, $expected, SafeMarkup::format('@uri file permissions @actual are identical to @expected.', [
+    return $this->assertSame($expected, $actual, SafeMarkup::format('@uri file permissions @actual are identical to @expected.', [
       '@uri' => $uri,
       '@actual' => 0 . decoct($actual),
       '@expected' => 0 . decoct($expected),
diff --git a/core/tests/Drupal/KernelTests/Core/File/MimeTypeTest.php b/core/tests/Drupal/KernelTests/Core/File/MimeTypeTest.php
index 05ac7c2..29340f5 100644
--- a/core/tests/Drupal/KernelTests/Core/File/MimeTypeTest.php
+++ b/core/tests/Drupal/KernelTests/Core/File/MimeTypeTest.php
@@ -45,12 +45,12 @@ public function testFileMimeTypeDetection() {
       // Test stream [URI].
       foreach ($prefixes as $prefix) {
         $output = $guesser->guess($prefix . $input);
-        $this->assertIdentical($output, $expected, format_string('Mimetype for %input is %output (expected: %expected).', ['%input' => $prefix . $input, '%output' => $output, '%expected' => $expected]));
+        $this->assertSame($expected, $output, format_string('Mimetype for %input is %output (expected: %expected).', ['%input' => $prefix . $input, '%output' => $output, '%expected' => $expected]));
       }
 
       // Test normal path equivalent
       $output = $guesser->guess($input);
-      $this->assertIdentical($output, $expected, format_string('Mimetype (using default mappings) for %input is %output (expected: %expected).', ['%input' => $input, '%output' => $output, '%expected' => $expected]));
+      $this->assertSame($expected, $output, format_string('Mimetype (using default mappings) for %input is %output (expected: %expected).', ['%input' => $input, '%output' => $output, '%expected' => $expected]));
     }
 
     // Now test the extension gusser by passing in a custom mapping.
@@ -85,7 +85,7 @@ public function testFileMimeTypeDetection() {
 
     foreach ($test_case as $input => $expected) {
       $output = $extension_guesser->guess($input);
-      $this->assertIdentical($output, $expected, format_string('Mimetype (using passed-in mappings) for %input is %output (expected: %expected).', ['%input' => $input, '%output' => $output, '%expected' => $expected]));
+      $this->assertSame($expected, $output, format_string('Mimetype (using passed-in mappings) for %input is %output (expected: %expected).', ['%input' => $input, '%output' => $output, '%expected' => $expected]));
     }
   }
 
diff --git a/core/tests/Drupal/KernelTests/Core/File/NameMungingTest.php b/core/tests/Drupal/KernelTests/Core/File/NameMungingTest.php
index 422f294..2e5d094 100644
--- a/core/tests/Drupal/KernelTests/Core/File/NameMungingTest.php
+++ b/core/tests/Drupal/KernelTests/Core/File/NameMungingTest.php
@@ -59,7 +59,7 @@ public function testMungeNullByte() {
   public function testMungeIgnoreInsecure() {
     $this->config('system.file')->set('allow_insecure_uploads', 1)->save();
     $munged_name = file_munge_filename($this->name, '');
-    $this->assertIdentical($munged_name, $this->name, format_string('The original filename (%original) matches the munged filename (%munged) when insecure uploads are enabled.', ['%munged' => $munged_name, '%original' => $this->name]));
+    $this->assertSame($munged_name, $this->name, format_string('The original filename (%original) matches the munged filename (%munged) when insecure uploads are enabled.', ['%munged' => $munged_name, '%original' => $this->name]));
   }
 
   /**
@@ -69,10 +69,10 @@ public function testMungeIgnoreWhitelisted() {
     // Declare our extension as whitelisted. The declared extensions should
     // be case insensitive so test using one with a different case.
     $munged_name = file_munge_filename($this->nameWithUcExt, $this->badExtension);
-    $this->assertIdentical($munged_name, $this->nameWithUcExt, format_string('The new filename (%munged) matches the original (%original) once the extension has been whitelisted.', ['%munged' => $munged_name, '%original' => $this->nameWithUcExt]));
+    $this->assertSame($munged_name, $this->nameWithUcExt, format_string('The new filename (%munged) matches the original (%original) once the extension has been whitelisted.', ['%munged' => $munged_name, '%original' => $this->nameWithUcExt]));
     // The allowed extensions should also be normalized.
     $munged_name = file_munge_filename($this->name, strtoupper($this->badExtension));
-    $this->assertIdentical($munged_name, $this->name, format_string('The new filename (%munged) matches the original (%original) also when the whitelisted extension is in uppercase.', ['%munged' => $munged_name, '%original' => $this->name]));
+    $this->assertSame($munged_name, $this->name, format_string('The new filename (%munged) matches the original (%original) also when the whitelisted extension is in uppercase.', ['%munged' => $munged_name, '%original' => $this->name]));
   }
 
   /**
@@ -81,7 +81,7 @@ public function testMungeIgnoreWhitelisted() {
   public function testUnMunge() {
     $munged_name = file_munge_filename($this->name, '', FALSE);
     $unmunged_name = file_unmunge_filename($munged_name);
-    $this->assertIdentical($unmunged_name, $this->name, format_string('The unmunged (%unmunged) filename matches the original (%original)', ['%unmunged' => $unmunged_name, '%original' => $this->name]));
+    $this->assertSame($unmunged_name, $this->name, format_string('The unmunged (%unmunged) filename matches the original (%original)', ['%unmunged' => $unmunged_name, '%original' => $this->name]));
   }
 
 }
diff --git a/core/tests/Drupal/KernelTests/Core/File/UrlRewritingTest.php b/core/tests/Drupal/KernelTests/Core/File/UrlRewritingTest.php
index 35d2ca0..bdf66bd 100644
--- a/core/tests/Drupal/KernelTests/Core/File/UrlRewritingTest.php
+++ b/core/tests/Drupal/KernelTests/Core/File/UrlRewritingTest.php
@@ -106,13 +106,13 @@ public function testRelativeFileURL() {
     // Shipped file.
     $filepath = 'core/assets/vendor/jquery/jquery.min.js';
     $url = file_create_url($filepath);
-    $this->assertIdentical(base_path() . $filepath, file_url_transform_relative($url));
+    $this->assertSame(base_path() . $filepath, file_url_transform_relative($url));
 
     // Managed file.
     $uri = $this->createUri();
     $url = file_create_url($uri);
     $public_directory_path = \Drupal::service('stream_wrapper_manager')->getViaScheme('public')->getDirectoryPath();
-    $this->assertIdentical(base_path() . $public_directory_path . '/' . rawurlencode(drupal_basename($uri)), file_url_transform_relative($url));
+    $this->assertSame(base_path() . $public_directory_path . '/' . rawurlencode(drupal_basename($uri)), file_url_transform_relative($url));
   }
 
 }
diff --git a/core/tests/Drupal/KernelTests/Core/Form/FormDefaultHandlersTest.php b/core/tests/Drupal/KernelTests/Core/Form/FormDefaultHandlersTest.php
index 6d79f17..12e1c93 100644
--- a/core/tests/Drupal/KernelTests/Core/Form/FormDefaultHandlersTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Form/FormDefaultHandlersTest.php
@@ -92,13 +92,13 @@ public function testDefaultAndCustomHandlers() {
 
     $handlers = $form_state->get('test_handlers');
 
-    $this->assertIdentical(count($handlers['validate']), 2);
-    $this->assertIdentical($handlers['validate'][0], 'customValidateForm');
-    $this->assertIdentical($handlers['validate'][1], 'validateForm');
+    $this->assertSame(2, count($handlers['validate']));
+    $this->assertSame('customValidateForm', $handlers['validate'][0]);
+    $this->assertSame('validateForm', $handlers['validate'][1]);
 
-    $this->assertIdentical(count($handlers['submit']), 2);
-    $this->assertIdentical($handlers['submit'][0], 'customSubmitForm');
-    $this->assertIdentical($handlers['submit'][1], 'submitForm');
+    $this->assertSame(2, count($handlers['submit']));
+    $this->assertSame('customSubmitForm', $handlers['submit'][0]);
+    $this->assertSame('submitForm', $handlers['submit'][1]);
   }
 
 }
diff --git a/core/tests/Drupal/KernelTests/Core/KeyValueStore/DatabaseStorageExpirableTest.php b/core/tests/Drupal/KernelTests/Core/KeyValueStore/DatabaseStorageExpirableTest.php
index 2d543cb..0a9f357 100644
--- a/core/tests/Drupal/KernelTests/Core/KeyValueStore/DatabaseStorageExpirableTest.php
+++ b/core/tests/Drupal/KernelTests/Core/KeyValueStore/DatabaseStorageExpirableTest.php
@@ -44,20 +44,20 @@ public function testCRUDWithExpiration() {
     // Verify that an item can be stored with setWithExpire().
     // Use a random expiration in each test.
     $stores[0]->setWithExpire('foo', $this->objects[0], rand(500, 100000));
-    $this->assertIdenticalObject($this->objects[0], $stores[0]->get('foo'));
+    $this->assertSameObject($this->objects[0], $stores[0]->get('foo'));
     // Verify that the other collection is not affected.
     $this->assertFalse($stores[1]->get('foo'));
 
     // Verify that an item can be updated with setWithExpire().
     $stores[0]->setWithExpire('foo', $this->objects[1], rand(500, 100000));
-    $this->assertIdenticalObject($this->objects[1], $stores[0]->get('foo'));
+    $this->assertSameObject($this->objects[1], $stores[0]->get('foo'));
     // Verify that the other collection is still not affected.
     $this->assertFalse($stores[1]->get('foo'));
 
     // Verify that the expirable data key is unique.
     $stores[1]->setWithExpire('foo', $this->objects[2], rand(500, 100000));
-    $this->assertIdenticalObject($this->objects[1], $stores[0]->get('foo'));
-    $this->assertIdenticalObject($this->objects[2], $stores[1]->get('foo'));
+    $this->assertSameObject($this->objects[1], $stores[0]->get('foo'));
+    $this->assertSameObject($this->objects[2], $stores[1]->get('foo'));
 
     // Verify that multiple items can be stored with setMultipleWithExpire().
     $values = [
@@ -78,7 +78,7 @@ public function testCRUDWithExpiration() {
     // Ensure that an item with the same name exists in the other collection.
     $stores[1]->set('foo', $this->objects[5]);
     $result = $stores[0]->getAll();
-    // Not using assertIdentical(), since the order is not defined for getAll().
+    // Not using assertSame(), since the order is not defined for getAll().
     $this->assertEqual(count($result), count($values));
     foreach ($result as $key => $value) {
       $this->assertEqual($values[$key], $value);
@@ -131,8 +131,8 @@ public function testExpiration() {
     $this->assertFalse($stores[0]->has('yesterday'));
     $this->assertFalse($stores[0]->get('yesterday'));
     $this->assertTrue($stores[0]->has('troubles'));
-    $this->assertIdentical($stores[0]->get('troubles'), 'here to stay');
-    $this->assertIdentical(count($stores[0]->getMultiple(['yesterday', 'troubles'])), 1);
+    $this->assertSame('here to stay', $stores[0]->get('troubles'));
+    $this->assertSame(1, count($stores[0]->getMultiple(['yesterday', 'troubles'])));
 
     // Store items set to expire in the past in various ways.
     $stores[0]->setWithExpire($this->randomMachineName(), $this->objects[0], -7 * $day);
@@ -149,7 +149,7 @@ public function testExpiration() {
 
     // Ensure only non-expired items are retrieved.
     $all = $stores[0]->getAll();
-    $this->assertIdentical(count($all), 2);
+    $this->assertSame(2, count($all));
     foreach (['troubles', 'still'] as $key) {
       $this->assertTrue(!empty($all[$key]));
     }
diff --git a/core/tests/Drupal/KernelTests/Core/KeyValueStore/GarbageCollectionTest.php b/core/tests/Drupal/KernelTests/Core/KeyValueStore/GarbageCollectionTest.php
index e0badd8..ea5a19a 100644
--- a/core/tests/Drupal/KernelTests/Core/KeyValueStore/GarbageCollectionTest.php
+++ b/core/tests/Drupal/KernelTests/Core/KeyValueStore/GarbageCollectionTest.php
@@ -39,7 +39,7 @@ public function testGarbageCollection() {
     for ($i = 0; $i <= 3; $i++) {
       $store->setWithExpire('key_' . $i, $this->randomObject(), rand(500, 100000));
     }
-    $this->assertIdentical(sizeof($store->getAll()), 4, 'Four items were written to the storage.');
+    $this->assertSame(4, sizeof($store->getAll()), 'Four items were written to the storage.');
 
     // Manually expire the data.
     for ($i = 0; $i <= 3; $i++) {
@@ -65,7 +65,7 @@ public function testGarbageCollection() {
       [
         ':collection' => $collection,
       ])->fetchAll();
-    $this->assertIdentical(count($result), 1, 'Only one item remains after garbage collection');
+    $this->assertSame(1, count($result), 'Only one item remains after garbage collection');
 
   }
 
diff --git a/core/tests/Drupal/KernelTests/Core/KeyValueStore/KeyValueContentEntityStorageTest.php b/core/tests/Drupal/KernelTests/Core/KeyValueStore/KeyValueContentEntityStorageTest.php
index 31300db..c940768 100644
--- a/core/tests/Drupal/KernelTests/Core/KeyValueStore/KeyValueContentEntityStorageTest.php
+++ b/core/tests/Drupal/KernelTests/Core/KeyValueStore/KeyValueContentEntityStorageTest.php
@@ -36,20 +36,20 @@ public function testCRUD() {
     $default_langcode = \Drupal::languageManager()->getDefaultLanguage()->getId();
     // Verify default properties on a newly created empty entity.
     $empty = EntityTestLabel::create();
-    $this->assertIdentical($empty->id->value, NULL);
-    $this->assertIdentical($empty->name->value, NULL);
+    $this->assertSame(NULL, $empty->id->value);
+    $this->assertSame(NULL, $empty->name->value);
     $this->assertTrue($empty->uuid->value);
-    $this->assertIdentical($empty->langcode->value, $default_langcode);
+    $this->assertSame($default_langcode, $empty->langcode->value);
 
     // Verify ConfigEntity properties/methods on the newly created empty entity.
-    $this->assertIdentical($empty->isNew(), TRUE);
-    $this->assertIdentical($empty->bundle(), 'entity_test_label');
-    $this->assertIdentical($empty->id(), NULL);
+    $this->assertSame(TRUE, $empty->isNew());
+    $this->assertSame('entity_test_label', $empty->bundle());
+    $this->assertSame(NULL, $empty->id());
     $this->assertTrue($empty->uuid());
-    $this->assertIdentical($empty->label(), NULL);
+    $this->assertSame(NULL, $empty->label());
 
     // Verify Entity properties/methods on the newly created empty entity.
-    $this->assertIdentical($empty->getEntityTypeId(), 'entity_test_label');
+    $this->assertSame('entity_test_label', $empty->getEntityTypeId());
     // The URI can only be checked after saving.
     try {
       $empty->urlInfo();
@@ -72,7 +72,7 @@ public function testCRUD() {
     $empty_id = EntityTestLabel::create([
       'id' => '',
     ]);
-    $this->assertIdentical($empty_id->isNew(), TRUE);
+    $this->assertSame(TRUE, $empty_id->isNew());
     try {
       $empty_id->save();
       $this->fail('EntityMalformedException was thrown.');
@@ -86,18 +86,18 @@ public function testCRUD() {
       'id' => $this->randomMachineName(),
       'name' => $this->randomString(),
     ]);
-    $this->assertIdentical($entity_test->id->value, $expected['id']);
+    $this->assertSame($expected['id'], $entity_test->id->value);
     $this->assertTrue($entity_test->uuid->value);
     $this->assertNotEqual($entity_test->uuid->value, $empty->uuid->value);
-    $this->assertIdentical($entity_test->name->value, $expected['name']);
-    $this->assertIdentical($entity_test->langcode->value, $default_langcode);
+    $this->assertSame($expected['name'], $entity_test->name->value);
+    $this->assertSame($default_langcode, $entity_test->langcode->value);
 
     // Verify methods on the newly created entity.
-    $this->assertIdentical($entity_test->isNew(), TRUE);
-    $this->assertIdentical($entity_test->id(), $expected['id']);
+    $this->assertSame(TRUE, $entity_test->isNew());
+    $this->assertSame($expected['id'], $entity_test->id());
     $this->assertTrue($entity_test->uuid());
     $expected['uuid'] = $entity_test->uuid();
-    $this->assertIdentical($entity_test->label(), $expected['name']);
+    $this->assertSame($expected['name'], $entity_test->label());
 
     // Verify that the entity can be saved.
     try {
@@ -109,26 +109,26 @@ public function testCRUD() {
     }
 
     // Verify that the correct status is returned and properties did not change.
-    $this->assertIdentical($status, SAVED_NEW);
-    $this->assertIdentical($entity_test->id(), $expected['id']);
-    $this->assertIdentical($entity_test->uuid(), $expected['uuid']);
-    $this->assertIdentical($entity_test->label(), $expected['name']);
-    $this->assertIdentical($entity_test->isNew(), FALSE);
+    $this->assertSame(SAVED_NEW, $status);
+    $this->assertSame($expected['id'], $entity_test->id());
+    $this->assertSame($expected['uuid'], $entity_test->uuid());
+    $this->assertSame($expected['name'], $entity_test->label());
+    $this->assertSame(FALSE, $entity_test->isNew());
 
     // Save again, and verify correct status and properties again.
     $status = $entity_test->save();
-    $this->assertIdentical($status, SAVED_UPDATED);
-    $this->assertIdentical($entity_test->id(), $expected['id']);
-    $this->assertIdentical($entity_test->uuid(), $expected['uuid']);
-    $this->assertIdentical($entity_test->label(), $expected['name']);
-    $this->assertIdentical($entity_test->isNew(), FALSE);
+    $this->assertSame(SAVED_UPDATED, $status);
+    $this->assertSame($expected['id'], $entity_test->id());
+    $this->assertSame($expected['uuid'], $entity_test->uuid());
+    $this->assertSame($expected['name'], $entity_test->label());
+    $this->assertSame(FALSE, $entity_test->isNew());
 
     // Ensure that creating an entity with the same id as an existing one is not
     // possible.
     $same_id = EntityTestLabel::create([
       'id' => $entity_test->id(),
     ]);
-    $this->assertIdentical($same_id->isNew(), TRUE);
+    $this->assertSame(TRUE, $same_id->isNew());
     try {
       $same_id->save();
       $this->fail('Not possible to overwrite an entity entity.');
@@ -143,17 +143,17 @@ public function testCRUD() {
       $old_id = $ids[$i - 1];
       $new_id = $ids[$i];
       // Before renaming, everything should point to the current ID.
-      $this->assertIdentical($entity_test->id(), $old_id);
+      $this->assertSame($old_id, $entity_test->id());
 
       // Rename.
       $entity_test->id = $new_id;
-      $this->assertIdentical($entity_test->id(), $new_id);
+      $this->assertSame($new_id, $entity_test->id());
       $status = $entity_test->save();
-      $this->assertIdentical($status, SAVED_UPDATED);
-      $this->assertIdentical($entity_test->isNew(), FALSE);
+      $this->assertSame(SAVED_UPDATED, $status);
+      $this->assertSame(FALSE, $entity_test->isNew());
 
       // Verify that originalID points to new ID directly after renaming.
-      $this->assertIdentical($entity_test->id(), $new_id);
+      $this->assertSame($new_id, $entity_test->id());
     }
   }
 
diff --git a/core/tests/Drupal/KernelTests/Core/KeyValueStore/StorageTestBase.php b/core/tests/Drupal/KernelTests/Core/KeyValueStore/StorageTestBase.php
index 7651234..d900b97 100644
--- a/core/tests/Drupal/KernelTests/Core/KeyValueStore/StorageTestBase.php
+++ b/core/tests/Drupal/KernelTests/Core/KeyValueStore/StorageTestBase.php
@@ -48,8 +48,8 @@ protected function setUp() {
   public function testCRUD() {
     $stores = $this->createStorage();
     // Verify that each store returns its own collection name.
-    $this->assertIdentical($stores[0]->getCollectionName(), $this->collections[0]);
-    $this->assertIdentical($stores[1]->getCollectionName(), $this->collections[1]);
+    $this->assertSame($this->collections[0], $stores[0]->getCollectionName());
+    $this->assertSame($this->collections[1], $stores[1]->getCollectionName());
 
     // Verify that an item can be stored.
     $stores[0]->set('foo', $this->objects[0]);
@@ -102,7 +102,7 @@ public function testCRUD() {
     // Ensure that an item with the same name exists in the other collection.
     $stores[1]->set('foo', $this->objects[5]);
     $result = $stores[0]->getAll();
-    // Not using assertIdentical(), since the order is not defined for getAll().
+    // Not using assertSame(), since the order is not defined for getAll().
     $this->assertEqual(count($result), count($values));
     foreach ($result as $key => $value) {
       $this->assertEqual($values[$key], $value);
@@ -134,11 +134,11 @@ public function testNonExistingKeys() {
     $this->assertNull($stores[0]->get('foo'));
 
     // Verify that a non-existing key with a default returns the default.
-    $this->assertIdentical($stores[0]->get('foo', 'bar'), 'bar');
+    $this->assertSame('bar', $stores[0]->get('foo', 'bar'));
 
     // Verify that a FALSE value can be stored.
     $stores[0]->set('foo', FALSE);
-    $this->assertIdentical($stores[0]->get('foo'), FALSE);
+    $this->assertSame(FALSE, $stores[0]->get('foo'));
 
     // Verify that a deleted key returns NULL as value.
     $stores[0]->delete('foo');
@@ -148,7 +148,7 @@ public function testNonExistingKeys() {
     $stores[0]->set('bar', 'baz');
     $values = $stores[0]->getMultiple(['foo', 'bar']);
     $this->assertFalse(isset($values['foo']), "Key 'foo' not found.");
-    $this->assertIdentical($values['bar'], 'baz');
+    $this->assertSame('baz', $values['bar']);
   }
 
   /**
@@ -185,9 +185,9 @@ public function testRename() {
     $store = $stores[0];
 
     $store->set('old', 'thing');
-    $this->assertIdentical($store->get('old'), 'thing');
+    $this->assertSame('thing', $store->get('old'));
     $store->rename('old', 'new');
-    $this->assertIdentical($store->get('new'), 'thing');
+    $this->assertSame('thing', $store->get('new'));
     $this->assertNull($store->get('old'));
   }
 
diff --git a/core/tests/Drupal/KernelTests/Core/Plugin/ContextPluginTest.php b/core/tests/Drupal/KernelTests/Core/Plugin/ContextPluginTest.php
index bd3bba5..a9ec4b8 100644
--- a/core/tests/Drupal/KernelTests/Core/Plugin/ContextPluginTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Plugin/ContextPluginTest.php
@@ -59,7 +59,7 @@ public function testContext() {
       $plugin->getContextValue('user');
     }
     catch (ContextException $e) {
-      $this->assertIdentical("The 'entity:user' context is required and not present.", $e->getMessage(), 'Requesting a non-set value of a required context should throw a context exception.');
+      $this->assertSame("The 'entity:user' context is required and not present.", $e->getMessage(), 'Requesting a non-set value of a required context should throw a context exception.');
     }
 
     // Try to pass the wrong class type as a context value.
diff --git a/core/tests/Drupal/KernelTests/Core/Plugin/DerivativeTest.php b/core/tests/Drupal/KernelTests/Core/Plugin/DerivativeTest.php
index 251abbf..5b3da91 100644
--- a/core/tests/Drupal/KernelTests/Core/Plugin/DerivativeTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Plugin/DerivativeTest.php
@@ -24,9 +24,9 @@ public function testDerivativeDecorator() {
     // Ensure that NULL is returned as the definition of a non-existing base
     // plugin, a non-existing derivative plugin, or a base plugin that may not
     // be used without deriving.
-    $this->assertIdentical($this->mockBlockManager->getDefinition('non_existing', FALSE), NULL, 'NULL returned as the definition of a non-existing base plugin.');
-    $this->assertIdentical($this->mockBlockManager->getDefinition('menu:non_existing', FALSE), NULL, 'NULL returned as the definition of a non-existing derivative plugin.');
-    $this->assertIdentical($this->mockBlockManager->getDefinition('menu', FALSE), NULL, 'NULL returned as the definition of a base plugin that may not be used without deriving.');
+    $this->assertSame(NULL, $this->mockBlockManager->getDefinition('non_existing', FALSE), 'NULL returned as the definition of a non-existing base plugin.');
+    $this->assertSame(NULL, $this->mockBlockManager->getDefinition('menu:non_existing', FALSE), 'NULL returned as the definition of a non-existing derivative plugin.');
+    $this->assertSame(NULL, $this->mockBlockManager->getDefinition('menu', FALSE), 'NULL returned as the definition of a base plugin that may not be used without deriving.');
   }
 
 }
diff --git a/core/tests/Drupal/KernelTests/Core/Plugin/Discovery/DiscoveryTestBase.php b/core/tests/Drupal/KernelTests/Core/Plugin/Discovery/DiscoveryTestBase.php
index a3492ed..a6afc1d 100644
--- a/core/tests/Drupal/KernelTests/Core/Plugin/Discovery/DiscoveryTestBase.php
+++ b/core/tests/Drupal/KernelTests/Core/Plugin/Discovery/DiscoveryTestBase.php
@@ -51,10 +51,10 @@ public function testDiscoveryInterface() {
     }
 
     // Ensure that an empty array is returned if no plugin definitions are found.
-    $this->assertIdentical($this->emptyDiscovery->getDefinitions(), [], 'array() returned if no plugin definitions are found.');
+    $this->assertSame([], $this->emptyDiscovery->getDefinitions(), 'array() returned if no plugin definitions are found.');
 
     // Ensure that NULL is returned as the definition of a non-existing plugin.
-    $this->assertIdentical($this->emptyDiscovery->getDefinition('non_existing', FALSE), NULL, 'NULL returned as the definition of a non-existing plugin.');
+    $this->assertSame(NULL, $this->emptyDiscovery->getDefinition('non_existing', FALSE), 'NULL returned as the definition of a non-existing plugin.');
   }
 
   /**
@@ -78,7 +78,7 @@ protected function assertDefinitionIdentical(array $definition, array $expected_
     };
     array_walk_recursive($definition, $func);
     array_walk_recursive($expected_definition, $func);
-    return $this->assertIdentical($definition, $expected_definition);
+    return $this->assertSame($expected_definition, $definition);
   }
 
 }
diff --git a/core/tests/Drupal/KernelTests/Core/Plugin/FactoryTest.php b/core/tests/Drupal/KernelTests/Core/Plugin/FactoryTest.php
index 50da5cf..77f7def 100644
--- a/core/tests/Drupal/KernelTests/Core/Plugin/FactoryTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Plugin/FactoryTest.php
@@ -17,8 +17,8 @@ class FactoryTest extends PluginTestBase {
   public function testDefaultFactory() {
     // Ensure a non-derivative plugin can be instantiated.
     $plugin = $this->testPluginManager->createInstance('user_login', ['title' => 'Please enter your login name and password']);
-    $this->assertIdentical(get_class($plugin), 'Drupal\plugin_test\Plugin\plugin_test\mock_block\MockUserLoginBlock', 'Correct plugin class instantiated with default factory.');
-    $this->assertIdentical($plugin->getTitle(), 'Please enter your login name and password', 'Plugin instance correctly configured.');
+    $this->assertSame('Drupal\plugin_test\Plugin\plugin_test\mock_block\MockUserLoginBlock', get_class($plugin), 'Correct plugin class instantiated with default factory.');
+    $this->assertSame('Please enter your login name and password', $plugin->getTitle(), 'Plugin instance correctly configured.');
 
     // Ensure that attempting to instantiate non-existing plugins throws a
     // PluginException.
@@ -47,12 +47,12 @@ public function testDefaultFactory() {
   public function testReflectionFactory() {
     // Ensure a non-derivative plugin can be instantiated.
     $plugin = $this->mockBlockManager->createInstance('user_login', ['title' => 'Please enter your login name and password']);
-    $this->assertIdentical(get_class($plugin), 'Drupal\plugin_test\Plugin\plugin_test\mock_block\MockUserLoginBlock', 'Correct plugin class instantiated.');
-    $this->assertIdentical($plugin->getTitle(), 'Please enter your login name and password', 'Plugin instance correctly configured.');
+    $this->assertSame('Drupal\plugin_test\Plugin\plugin_test\mock_block\MockUserLoginBlock', get_class($plugin), 'Correct plugin class instantiated.');
+    $this->assertSame('Please enter your login name and password', $plugin->getTitle(), 'Plugin instance correctly configured.');
 
     // Ensure a derivative plugin can be instantiated.
     $plugin = $this->mockBlockManager->createInstance('menu:main_menu', ['depth' => 2]);
-    $this->assertIdentical($plugin->getContent(), '<ul><li>1<ul><li>1.1</li></ul></li></ul>', 'Derived plugin instance correctly instantiated and configured.');
+    $this->assertSame('<ul><li>1<ul><li>1.1</li></ul></li></ul>', $plugin->getContent(), 'Derived plugin instance correctly instantiated and configured.');
 
     // Ensure that attempting to instantiate non-existing plugins throws a
     // PluginException. Test this for a non-existing base plugin, a non-existing
diff --git a/core/tests/Drupal/KernelTests/Core/Plugin/InspectionTest.php b/core/tests/Drupal/KernelTests/Core/Plugin/InspectionTest.php
index 454165d..8d848cc 100644
--- a/core/tests/Drupal/KernelTests/Core/Plugin/InspectionTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Plugin/InspectionTest.php
@@ -16,26 +16,26 @@ public function testInspection() {
     foreach (['user_login'] as $id) {
       $plugin = $this->testPluginManager->createInstance($id);
       $expected_definition = $this->testPluginExpectedDefinitions[$id];
-      $this->assertIdentical($plugin->getPluginId(), $id);
-      $this->assertIdentical($this->testPluginManager->getDefinition($id), $expected_definition);
-      $this->assertIdentical($plugin->getPluginDefinition(), $expected_definition);
+      $this->assertSame($id, $plugin->getPluginId());
+      $this->assertSame($expected_definition, $this->testPluginManager->getDefinition($id));
+      $this->assertSame($expected_definition, $plugin->getPluginDefinition());
     }
     // Skip the 'menu' derived blocks, because MockMenuBlock does not implement
     // PluginInspectionInterface. The others do by extending PluginBase.
     foreach (['user_login', 'layout'] as $id) {
       $plugin = $this->mockBlockManager->createInstance($id);
       $expected_definition = $this->mockBlockExpectedDefinitions[$id];
-      $this->assertIdentical($plugin->getPluginId(), $id);
-      $this->assertIdentical($this->castSafeStrings($this->mockBlockManager->getDefinition($id)), $expected_definition);
-      $this->assertIdentical($this->castSafeStrings($plugin->getPluginDefinition()), $expected_definition);
+      $this->assertSame($id, $plugin->getPluginId());
+      $this->assertSame($expected_definition, $this->castSafeStrings($this->mockBlockManager->getDefinition($id)));
+      $this->assertSame($expected_definition, $this->castSafeStrings($plugin->getPluginDefinition()));
     }
     // Test a plugin manager that provides defaults.
     foreach (['test_block1', 'test_block2'] as $id) {
       $plugin = $this->defaultsTestPluginManager->createInstance($id);
       $expected_definition = $this->defaultsTestPluginExpectedDefinitions[$id];
-      $this->assertIdentical($plugin->getPluginId(), $id);
-      $this->assertIdentical($this->defaultsTestPluginManager->getDefinition($id), $expected_definition);
-      $this->assertIdentical($this->castSafeStrings($plugin->getPluginDefinition()), $expected_definition);
+      $this->assertSame($id, $plugin->getPluginId());
+      $this->assertSame($expected_definition, $this->defaultsTestPluginManager->getDefinition($id));
+      $this->assertSame($expected_definition, $this->castSafeStrings($plugin->getPluginDefinition()));
     }
   }
 
diff --git a/core/tests/Drupal/KernelTests/Core/Render/Element/RenderElementTypesTest.php b/core/tests/Drupal/KernelTests/Core/Render/Element/RenderElementTypesTest.php
index 906e74b..3544747 100644
--- a/core/tests/Drupal/KernelTests/Core/Render/Element/RenderElementTypesTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Render/Element/RenderElementTypesTest.php
@@ -45,7 +45,7 @@ protected function assertElements(array $elements, $expected_html, $message) {
     $out .= '</tr></table>';
     $this->verbose($out);
 
-    $this->assertIdentical($actual_html, $expected_html, Html::escape($message));
+    $this->assertSame($expected_html, $actual_html, Html::escape($message));
   }
 
   /**
diff --git a/core/tests/Drupal/KernelTests/Core/Theme/RegistryTest.php b/core/tests/Drupal/KernelTests/Core/Theme/RegistryTest.php
index a962fec..a20798e 100644
--- a/core/tests/Drupal/KernelTests/Core/Theme/RegistryTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Theme/RegistryTest.php
@@ -77,7 +77,7 @@ public function testMultipleSubThemes() {
     $registry_base_theme->setThemeManager(\Drupal::theme());
 
     $preprocess_functions = $registry_subsub_theme->get()['theme_test_template_test']['preprocess functions'];
-    $this->assertIdentical([
+    $this->assertSame([
       'template_preprocess',
       'test_basetheme_preprocess_theme_test_template_test',
       'test_subtheme_preprocess_theme_test_template_test',
@@ -85,20 +85,20 @@ public function testMultipleSubThemes() {
     ], $preprocess_functions);
 
     $preprocess_functions = $registry_sub_theme->get()['theme_test_template_test']['preprocess functions'];
-    $this->assertIdentical([
+    $this->assertSame([
       'template_preprocess',
       'test_basetheme_preprocess_theme_test_template_test',
       'test_subtheme_preprocess_theme_test_template_test',
     ], $preprocess_functions);
 
     $preprocess_functions = $registry_base_theme->get()['theme_test_template_test']['preprocess functions'];
-    $this->assertIdentical([
+    $this->assertSame([
       'template_preprocess',
       'test_basetheme_preprocess_theme_test_template_test',
     ], $preprocess_functions);
 
     $preprocess_functions = $registry_base_theme->get()['theme_test_function_suggestions']['preprocess functions'];
-    $this->assertIdentical([
+    $this->assertSame([
        'template_preprocess_theme_test_function_suggestions',
        'test_basetheme_preprocess_theme_test_function_suggestions',
     ], $preprocess_functions, "Theme functions don't have template_preprocess but do have template_preprocess_HOOK");
@@ -125,7 +125,7 @@ public function testSuggestionPreprocessFunctions() {
       $hook .= "$suggestion";
       $expected_preprocess_functions[] = "test_theme_preprocess_$hook";
       $preprocess_functions = $registry_theme->get()[$hook]['preprocess functions'];
-      $this->assertIdentical($expected_preprocess_functions, $preprocess_functions, "$hook has correct preprocess functions.");
+      $this->assertSame($expected_preprocess_functions, $preprocess_functions, "$hook has correct preprocess functions.");
     } while ($suggestion = array_shift($suggestions));
 
     $expected_preprocess_functions = [
@@ -136,10 +136,10 @@ public function testSuggestionPreprocessFunctions() {
     ];
 
     $preprocess_functions = $registry_theme->get()['theme_test_preprocess_suggestions__kitten__meerkat']['preprocess functions'];
-    $this->assertIdentical($expected_preprocess_functions, $preprocess_functions, 'Suggestion implemented as a function correctly inherits preprocess functions.');
+    $this->assertSame($expected_preprocess_functions, $preprocess_functions, 'Suggestion implemented as a function correctly inherits preprocess functions.');
 
     $preprocess_functions = $registry_theme->get()['theme_test_preprocess_suggestions__kitten__bearcat']['preprocess functions'];
-    $this->assertIdentical($expected_preprocess_functions, $preprocess_functions, 'Suggestion implemented as a template correctly inherits preprocess functions.');
+    $this->assertSame($expected_preprocess_functions, $preprocess_functions, 'Suggestion implemented as a template correctly inherits preprocess functions.');
 
     $this->assertTrue(isset($registry_theme->get()['theme_test_preprocess_suggestions__kitten__meerkat__tarsier__moose']), 'Preprocess function with an unimplemented lower-level suggestion is added to the registry.');
   }
diff --git a/core/tests/Drupal/KernelTests/Core/Theme/ThemeInstallerTest.php b/core/tests/Drupal/KernelTests/Core/Theme/ThemeInstallerTest.php
index 61f6475..f83c962 100644
--- a/core/tests/Drupal/KernelTests/Core/Theme/ThemeInstallerTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Theme/ThemeInstallerTest.php
@@ -49,7 +49,7 @@ public function testEmpty() {
     $this->assertTrue($this->themeHandler()->rebuildThemeData()['stark'], 'ThemeHandler::rebuildThemeData() yields all available themes.');
 
     // theme_get_setting() should return global default theme settings.
-    $this->assertIdentical(theme_get_setting('features.favicon'), TRUE);
+    $this->assertSame(TRUE, theme_get_setting('features.favicon'));
   }
 
   /**
@@ -63,7 +63,7 @@ public function testInstall() {
 
     $this->themeInstaller()->install([$name]);
 
-    $this->assertIdentical($this->extensionConfig()->get("theme.$name"), 0);
+    $this->assertSame(0, $this->extensionConfig()->get("theme.$name"));
 
     $themes = $this->themeHandler()->listInfo();
     $this->assertTrue(isset($themes[$name]));
@@ -72,7 +72,7 @@ public function testInstall() {
     $this->assertEqual(array_keys(system_list('theme')), array_keys($themes));
 
     // Verify that test_basetheme.settings is active.
-    $this->assertIdentical(theme_get_setting('features.favicon', $name), FALSE);
+    $this->assertSame(FALSE, theme_get_setting('features.favicon', $name));
     $this->assertEqual(theme_get_setting('base', $name), 'only');
     $this->assertEqual(theme_get_setting('override', $name), 'base');
   }
diff --git a/core/tests/Drupal/KernelTests/Core/Theme/ThemeSettingsTest.php b/core/tests/Drupal/KernelTests/Core/Theme/ThemeSettingsTest.php
index a077c25..b18579e 100644
--- a/core/tests/Drupal/KernelTests/Core/Theme/ThemeSettingsTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Theme/ThemeSettingsTest.php
@@ -46,7 +46,7 @@ public function testDefaultConfig() {
     $path = $this->availableThemes[$name]->getPath();
     $this->assertTrue(file_exists("$path/" . InstallStorage::CONFIG_INSTALL_DIRECTORY . "/$name.settings.yml"));
     $this->container->get('theme_handler')->install([$name]);
-    $this->assertIdentical(theme_get_setting('base', $name), 'only');
+    $this->assertSame('only', theme_get_setting('base', $name));
   }
 
   /**
diff --git a/core/tests/Drupal/KernelTests/Core/TypedData/TypedDataTest.php b/core/tests/Drupal/KernelTests/Core/TypedData/TypedDataTest.php
index c79f2cf..773a87c 100644
--- a/core/tests/Drupal/KernelTests/Core/TypedData/TypedDataTest.php
+++ b/core/tests/Drupal/KernelTests/Core/TypedData/TypedDataTest.php
@@ -185,7 +185,7 @@ public function testGetAndSet() {
     $value = 'PT20S';
     $typed_data = $this->createTypedData(['type' => 'duration_iso8601'], $value);
     $this->assertTrue($typed_data instanceof DurationInterface, 'Typed data object is an instance of DurationInterface.');
-    $this->assertIdentical($typed_data->getValue(), $value, 'DurationIso8601 value was fetched.');
+    $this->assertSame($value, $typed_data->getValue(), 'DurationIso8601 value was fetched.');
     $this->assertEqual($typed_data->validate()->count(), 0);
     $typed_data->setValue('P40D');
     $this->assertEqual($typed_data->getDuration()->d, 40, 'DurationIso8601 value was changed and set by duration string.');
@@ -209,7 +209,7 @@ public function testGetAndSet() {
     $value = 20;
     $typed_data = $this->createTypedData(['type' => 'timespan'], $value);
     $this->assertTrue($typed_data instanceof DurationInterface, 'Typed data object is an instance of DurationInterface.');
-    $this->assertIdentical($typed_data->getValue(), $value, 'Time span value was fetched.');
+    $this->assertSame($value, $typed_data->getValue(), 'Time span value was fetched.');
     $this->assertEqual($typed_data->validate()->count(), 0);
     $typed_data->setValue(60 * 60 * 4);
     $this->assertEqual($typed_data->getDuration()->s, 14400, 'Time span was changed');
@@ -260,10 +260,10 @@ public function testGetAndSet() {
     $value = $this->randomString();
     $typed_data = $this->createTypedData(['type' => 'email'], $value);
     $this->assertTrue($typed_data instanceof StringInterface, 'Typed data object is an instance of StringInterface.');
-    $this->assertIdentical($typed_data->getValue(), $value, 'Email value was fetched.');
+    $this->assertSame($value, $typed_data->getValue(), 'Email value was fetched.');
     $new_value = 'test@example.com';
     $typed_data->setValue($new_value);
-    $this->assertIdentical($typed_data->getValue(), $new_value, 'Email value was changed.');
+    $this->assertSame($new_value, $typed_data->getValue(), 'Email value was changed.');
     $this->assertTrue(is_string($typed_data->getString()), 'Email value was converted to string');
     $this->assertEqual($typed_data->validate()->count(), 0);
     $typed_data->setValue(NULL);
@@ -296,10 +296,10 @@ public function testGetAndSet() {
     // Any type.
     $value = ['foo'];
     $typed_data = $this->createTypedData(['type' => 'any'], $value);
-    $this->assertIdentical($typed_data->getValue(), $value, 'Any value was fetched.');
+    $this->assertSame($value, $typed_data->getValue(), 'Any value was fetched.');
     $new_value = 'test@example.com';
     $typed_data->setValue($new_value);
-    $this->assertIdentical($typed_data->getValue(), $new_value, 'Any value was changed.');
+    $this->assertSame($new_value, $typed_data->getValue(), 'Any value was changed.');
     $this->assertTrue(is_string($typed_data->getString()), 'Any value was converted to string');
     $this->assertEqual($typed_data->validate()->count(), 0);
     $typed_data->setValue(NULL);
@@ -353,8 +353,8 @@ public function testTypedDataLists() {
     // Make sure that resetting the value using NULL results in an empty array.
     $clone->setValue([]);
     $typed_data->setValue(NULL);
-    $this->assertIdentical($typed_data->getValue(), []);
-    $this->assertIdentical($clone->getValue(), []);
+    $this->assertSame([], $typed_data->getValue());
+    $this->assertSame([], $clone->getValue());
 
     // Test dealing with NULL items.
     $typed_data[] = NULL;
@@ -475,7 +475,7 @@ public function testTypedDataMaps() {
 
     $properties = $typed_data->getProperties();
     $this->assertEqual(array_keys($properties), array_keys($value));
-    $this->assertIdentical($properties['one'], $typed_data->get('one'), 'Properties are identical.');
+    $this->assertSame($typed_data->get('one'), $properties['one'], 'Properties are identical.');
 
     // Test setting a not defined property. It shouldn't show up in the
     // properties, but be kept in the values.
@@ -549,7 +549,7 @@ public function testTypedDataValidation() {
     $message = t('This value should be %limit or more.', ['%limit' => 5]);
     $this->assertEqual($violations[0]->getMessage(), $message, 'Translated violation message retrieved.');
     $this->assertEqual($violations[0]->getPropertyPath(), '');
-    $this->assertIdentical($violations[0]->getRoot(), $integer, 'Root object returned.');
+    $this->assertSame($integer, $violations[0]->getRoot(), 'Root object returned.');
 
     // Test translating violation messages when pluralization is used.
     $definition = DataDefinition::create('string')
@@ -628,7 +628,7 @@ public function testTypedDataValidation() {
     $this->assertEqual($violations->count(), 1);
 
     $this->assertEqual($violations[0]->getInvalidValue(), 'string');
-    $this->assertIdentical($violations[0]->getPropertyPath(), '0.value');
+    $this->assertSame('0.value', $violations[0]->getPropertyPath());
   }
 
 }