CommentNodeChangesTest.php

<?php

namespace Drupal\Tests\comment\Functional;

use Drupal\comment\Entity\Comment;
use Drupal\field\Entity\FieldConfig;
use Drupal\field\Entity\FieldStorageConfig;

/**
 * Tests that comments behave correctly when the node is changed.
 *
 * @group comment
 */
class CommentNodeChangesTest extends CommentTestBase {
    
    /**
     * {@inheritdoc}
     */
    protected $defaultTheme = 'stark';
    
    /**
     * Tests that comments are deleted with the node.
     */
    public function testNodeDeletion() {
        $this->drupalLogin($this->webUser);
        $comment = $this->postComment($this->node, $this->randomMachineName(), $this->randomMachineName());
        $this->assertInstanceOf(Comment::class, $comment);
        $this->node
            ->delete();
        $this->assertNull(Comment::load($comment->id()), 'The comment could not be loaded after the node was deleted.');
        // Make sure the comment field storage and all its fields are deleted when
        // the node type is deleted.
        $this->assertNotNull(FieldStorageConfig::load('node.comment'), 'Comment field storage exists');
        $this->assertNotNull(FieldConfig::load('node.article.comment'), 'Comment field exists');
        // Delete the node type.
        $this->node
            ->get('type')->entity
            ->delete();
        $this->assertNull(FieldStorageConfig::load('node.comment'), 'Comment field storage deleted');
        $this->assertNull(FieldConfig::load('node.article.comment'), 'Comment field deleted');
    }

}