diff --git a/core/modules/aggregator/lib/Drupal/aggregator/Tests/FeedParserTest.php b/core/modules/aggregator/lib/Drupal/aggregator/Tests/FeedParserTest.php
index 96ee61f..5d4199f 100644
--- a/core/modules/aggregator/lib/Drupal/aggregator/Tests/FeedParserTest.php
+++ b/core/modules/aggregator/lib/Drupal/aggregator/Tests/FeedParserTest.php
@@ -87,7 +87,7 @@ function testHtmlEntitiesSample() {
   function testRedirectFeed() {
     // Simulate a typo in the URL to force a curl exception.
     $invalid_url = url('aggregator/redirect', array('absolute' => TRUE));
-    $feed = entity_create('aggregator_feed', array('url' => $invalid_url));
+    $feed = entity_create('aggregator_feed', array('url' => $invalid_url, 'title' => $this->randomName()));
     $feed->save();
     $feed->refreshItems();
 
diff --git a/core/modules/comment/lib/Drupal/comment/CommentStorage.php b/core/modules/comment/lib/Drupal/comment/CommentStorage.php
index 0246f73..5526d2b 100644
--- a/core/modules/comment/lib/Drupal/comment/CommentStorage.php
+++ b/core/modules/comment/lib/Drupal/comment/CommentStorage.php
@@ -138,7 +138,6 @@ public function getSchema() {
     $schema['comment']['fields']['pid']['not null'] = TRUE;
     $schema['comment']['fields']['status']['not null'] = TRUE;
     $schema['comment']['fields']['entity_id']['not null'] = TRUE;
-    $schema['comment']['fields']['entity_type']['not null'] = TRUE;
     $schema['comment']['fields']['field_id']['not null'] = TRUE;
     $schema['comment']['fields']['created']['not null'] = TRUE;
     $schema['comment']['fields']['thread']['not null'] = TRUE;
diff --git a/core/modules/forum/lib/Drupal/forum/Tests/Views/ForumIntegrationTest.php b/core/modules/forum/lib/Drupal/forum/Tests/Views/ForumIntegrationTest.php
index 65d9f1b..6e40370 100644
--- a/core/modules/forum/lib/Drupal/forum/Tests/Views/ForumIntegrationTest.php
+++ b/core/modules/forum/lib/Drupal/forum/Tests/Views/ForumIntegrationTest.php
@@ -51,7 +51,7 @@ protected function setUp() {
   public function testForumIntegration() {
     // Create a forum.
     $entity_manager = $this->container->get('entity.manager');
-    $term = $entity_manager->getStorage('taxonomy_term')->create(array('vid' => 'forums'));
+    $term = $entity_manager->getStorage('taxonomy_term')->create(array('vid' => 'forums', 'name' => $this->randomName()));
     $term->save();
 
     $comment_storage = $entity_manager->getStorage('comment');
diff --git a/core/modules/migrate_drupal/lib/Drupal/migrate_drupal/Tests/d6/MigrateFieldInstanceTest.php b/core/modules/migrate_drupal/lib/Drupal/migrate_drupal/Tests/d6/MigrateFieldInstanceTest.php
index c6ad455..14014e2 100644
--- a/core/modules/migrate_drupal/lib/Drupal/migrate_drupal/Tests/d6/MigrateFieldInstanceTest.php
+++ b/core/modules/migrate_drupal/lib/Drupal/migrate_drupal/Tests/d6/MigrateFieldInstanceTest.php
@@ -140,7 +140,6 @@ public function testFieldInstanceSettings() {
       'uri_scheme' => 'public',
       'handler' => 'default',
       'target_bundle' => NULL,
-      'max_length' => 255,
     );
     // This is the only way to compare arrays.
     $this->assertFalse(array_diff_assoc($field->getSettings(), $expected));
diff --git a/core/modules/taxonomy/lib/Drupal/taxonomy/Tests/TermTranslationUITest.php b/core/modules/taxonomy/lib/Drupal/taxonomy/Tests/TermTranslationUITest.php
index a027ade..c51428c 100644
--- a/core/modules/taxonomy/lib/Drupal/taxonomy/Tests/TermTranslationUITest.php
+++ b/core/modules/taxonomy/lib/Drupal/taxonomy/Tests/TermTranslationUITest.php
@@ -121,7 +121,10 @@ function testTranslateLinkVocabularyAdminPage() {
     $this->admin_user = $this->drupalCreateUser(array_merge(parent::getTranslatorPermissions(), array('access administration pages', 'administer taxonomy')));
     $this->drupalLogin($this->admin_user);
 
-    $translatable_tid = $this->createEntity(array(), $this->langcodes[0], $this->vocabulary->id());
+    $values = array(
+      'name' => $this->randomName(),
+    );
+    $translatable_tid = $this->createEntity($values, $this->langcodes[0], $this->vocabulary->id());
 
     // Create an untranslatable vocabulary.
     $untranslatable_vocabulary = entity_create('taxonomy_vocabulary', array(
@@ -133,7 +136,10 @@ function testTranslateLinkVocabularyAdminPage() {
     ));
     $untranslatable_vocabulary->save();
 
-    $untranslatable_tid = $this->createEntity(array(), $this->langcodes[0], $untranslatable_vocabulary->id());
+    $values = array(
+      'name' => $this->randomName(),
+    );
+    $untranslatable_tid = $this->createEntity($values, $this->langcodes[0], $untranslatable_vocabulary->id());
 
     // Verify translation links.
     $this->drupalGet('admin/structure/taxonomy/manage/' .  $this->vocabulary->id() . '/overview');