--- /dev/null
+<?php
+
+namespace Drupal\Tests\comment\Functional;
+
+use Drupal\comment\Entity\CommentType;
+use Drupal\comment\Plugin\Field\FieldType\CommentItemInterface;
+use Drupal\Core\Language\LanguageInterface;
+use Drupal\comment\CommentInterface;
+use Drupal\Tests\taxonomy\Functional\TaxonomyTestTrait;
+use Drupal\comment\Entity\Comment;
+
+/**
+ * Tests comments with other entities.
+ *
+ * @group comment
+ */
+class CommentEntityTest extends CommentTestBase {
+
+ /**
+ * Modules to install.
+ *
+ * @var array
+ */
+ public static $modules = ['block', 'comment', 'node', 'history', 'field_ui', 'datetime', 'taxonomy'];
+
+ use TaxonomyTestTrait;
+
+ protected $vocab;
+ protected $commentType;
+
+ protected function setUp() {
+ parent::setUp();
+
+ $this->vocab = $this->createVocabulary();
+ $this->commentType = CommentType::create([
+ 'id' => 'taxonomy_comment',
+ 'label' => 'Taxonomy comment',
+ 'description' => '',
+ 'target_entity_type_id' => 'taxonomy_term',
+ ]);
+ $this->commentType->save();
+ $this->addDefaultCommentField(
+ 'taxonomy_term',
+ $this->vocab->id(),
+ 'field_comment',
+ CommentItemInterface::OPEN,
+ $this->commentType->id()
+ );
+ }
+
+ /**
+ * Tests CSS classes on comments.
+ */
+ public function testEntityChanges() {
+ $this->drupalLogin($this->webUser);
+ // Create a new node.
+ $term = $this->createTerm($this->vocab, ['uid' => $this->webUser->id()]);
+
+ // Add a comment.
+ /** @var \Drupal\comment\CommentInterface $comment */
+ $comment = Comment::create([
+ 'entity_id' => $term->id(),
+ 'entity_type' => 'taxonomy_term',
+ 'field_name' => 'field_comment',
+ 'uid' => $this->webUser->id(),
+ 'status' => CommentInterface::PUBLISHED,
+ 'subject' => $this->randomMachineName(),
+ 'language' => LanguageInterface::LANGCODE_NOT_SPECIFIED,
+ 'comment_body' => [LanguageInterface::LANGCODE_NOT_SPECIFIED => [$this->randomMachineName()]],
+ ]);
+ $comment->save();
+
+ // Request the node with the comment.
+ $this->drupalGet('taxonomy/term/' . $term->id());
+ $settings = $this->getDrupalSettings();
+ $this->assertFalse(isset($settings['ajaxPageState']['libraries']) && in_array('comment/drupal.comment-new-indicator', explode(',', $settings['ajaxPageState']['libraries'])), 'drupal.comment-new-indicator library is present.');
+ $this->assertFalse(isset($settings['history']['lastReadTimestamps']) && in_array($term->id(), array_keys($settings['history']['lastReadTimestamps'])), 'history.lastReadTimestamps is present.');
+ }
+
+}