class CommentManagerTest

class CommentManagerTest extends UnitTestCase {
  
  /**
   * Tests the getFields method.
   *
   * @covers ::getFields
   */
  public function testGetFields() : void {
    // Set up a content entity type.
    $entity_type = $this->createMock('Drupal\\Core\\Entity\\ContentEntityTypeInterface');
    $entity_type->expects($this->any())
      ->method('getClass')
      ->willReturn('Node');
    $entity_type->expects($this->any())
      ->method('entityClassImplements')
      ->with(FieldableEntityInterface::class)
      ->willReturn(TRUE);
    $entity_field_manager = $this->createMock(EntityFieldManagerInterface::class);
    $entity_type_manager = $this->createMock(EntityTypeManagerInterface::class);
    $entity_field_manager->expects($this->once())
      ->method('getFieldMapByFieldType')
      ->willReturn([
      'node' => [
        'field_foobar' => [
          'type' => 'comment',
        ],
      ],
    ]);
    $entity_type_manager->expects($this->any())
      ->method('getDefinition')
      ->willReturn($entity_type);
    $comment_manager = new CommentManager($entity_type_manager, $this->createMock('Drupal\\Core\\Config\\ConfigFactoryInterface'), $this->createMock('Drupal\\Core\\StringTranslation\\TranslationInterface'), $this->createMock('Drupal\\Core\\Extension\\ModuleHandlerInterface'), $this->createMock(AccountInterface::class), $entity_field_manager, $this->prophesize(EntityDisplayRepositoryInterface::class)
      ->reveal());
    $comment_fields = $comment_manager->getFields('node');
    $this->assertArrayHasKey('field_foobar', $comment_fields);
  }

}