.../MediaSettingsDefaultIframeDomainUpdateTest.php |  4 +-
 ...GlobalThemeSettingsDefaultLogoUrlUpdateTest.php |  3 +-
 .../UpdateSettingsDefaultFetchUrlUpdateTest.php    | 45 +++++++++++-----------
 core/modules/update/update.install                 |  1 -
 4 files changed, 25 insertions(+), 28 deletions(-)

diff --git a/core/modules/media/tests/src/Functional/Update/MediaSettingsDefaultIframeDomainUpdateTest.php b/core/modules/media/tests/src/Functional/Update/MediaSettingsDefaultIframeDomainUpdateTest.php
index 27b0b7887e..0f12e6e5e5 100644
--- a/core/modules/media/tests/src/Functional/Update/MediaSettingsDefaultIframeDomainUpdateTest.php
+++ b/core/modules/media/tests/src/Functional/Update/MediaSettingsDefaultIframeDomainUpdateTest.php
@@ -52,8 +52,8 @@ public function testUpdate() {
 
     $this->runUpdates();
 
-    $logo_url_after = $this->config('media.settings')->get('iframe_domain');
-    $this->assertSame(NULL, $logo_url_after);
+    $iframe_domain_after = $this->config('media.settings')->get('iframe_domain');
+    $this->assertNull($iframe_domain_after);
   }
 
 }
diff --git a/core/modules/system/tests/src/Functional/Update/GlobalThemeSettingsDefaultLogoUrlUpdateTest.php b/core/modules/system/tests/src/Functional/Update/GlobalThemeSettingsDefaultLogoUrlUpdateTest.php
index ff43f2502e..54316ff9ed 100644
--- a/core/modules/system/tests/src/Functional/Update/GlobalThemeSettingsDefaultLogoUrlUpdateTest.php
+++ b/core/modules/system/tests/src/Functional/Update/GlobalThemeSettingsDefaultLogoUrlUpdateTest.php
@@ -19,7 +19,6 @@ class GlobalThemeSettingsDefaultLogoUrlUpdateTest extends UpdatePathTestBase {
    */
   protected $defaultTheme = 'stark';
 
-
   /**
    * {@inheritdoc}
    */
@@ -39,7 +38,7 @@ public function testUpdate() {
     $this->runUpdates();
 
     $logo_url_after = $this->config('system.theme.global')->get('logo.url');
-    $this->assertSame(NULL, $logo_url_after);
+    $this->assertNull($logo_url_after);
   }
 
 }
diff --git a/core/modules/update/tests/src/Functional/Update/UpdateSettingsDefaultFetchUrlUpdateTest.php b/core/modules/update/tests/src/Functional/Update/UpdateSettingsDefaultFetchUrlUpdateTest.php
index bcb47d6195..1d82f1d645 100644
--- a/core/modules/update/tests/src/Functional/Update/UpdateSettingsDefaultFetchUrlUpdateTest.php
+++ b/core/modules/update/tests/src/Functional/Update/UpdateSettingsDefaultFetchUrlUpdateTest.php
@@ -20,7 +20,6 @@ class UpdateSettingsDefaultFetchUrlUpdateTest extends UpdatePathTestBase {
    */
   protected $defaultTheme = 'stark';
 
-
   /**
    * {@inheritdoc}
    */
@@ -65,37 +64,37 @@ protected function setUp(): void {
       ->execute();
 
     // Create update.settings config.
+    $default_update_settings = [
+      'check' => [
+        'disabled_extensions' => FALSE,
+        'interval_days' => 1,
+      ],
+      'fetch' => [
+        'url' => '',
+        'max_attempts' => 2,
+        'timeout' => 30,
+      ],
+      'notification' => [
+        'emails' => [],
+        'threshold' => 'all',
+      ],
+    ];
     $connection->insert('config')
-      ->fields(array(
+      ->fields([
         'collection',
         'name',
         'data',
-      ))
-      ->values(array(
+      ])
+      ->values([
         'collection' => '',
         'name' => 'update.settings',
-        'data' => serialize([
-          'check' => [
-            'disabled_extensions' => FALSE,
-            'interval_days' => 1,
-          ],
-          'fetch' => [
-            'url' => '',
-            'max_attempts' => 2,
-            'timeout' => 30,
-          ],
-          'notification' => [
-            'emails' => [],
-            'threshold' => 'all',
-          ],
-        ])
-      ))
+        'data' => serialize($default_update_settings),
+      ])
       ->execute();
   }
 
-
   /**
-   * Tests update of update.settings:fetch.url
+   * Tests update of update.settings:fetch.url.
    */
   public function testUpdate() {
     $fetch_url_before = $this->config('update.settings')->get('fetch.url');
@@ -104,7 +103,7 @@ public function testUpdate() {
     $this->runUpdates();
 
     $fetch_url_after = $this->config('update.settings')->get('fetch.url');
-    $this->assertSame(NULL, $fetch_url_after);
+    $this->assertNull($fetch_url_after);
   }
 
 }
diff --git a/core/modules/update/update.install b/core/modules/update/update.install
index dd65e88b1f..a9140c44e8 100644
--- a/core/modules/update/update.install
+++ b/core/modules/update/update.install
@@ -187,4 +187,3 @@ function update_update_10200() {
       ->save(TRUE);
   }
 }
-