class JsonApiDocumentTopLevelNormalizerTest

class JsonApiDocumentTopLevelNormalizerTest extends JsonapiKernelTestBase {
  use ImageFieldCreationTrait;
  
  /**
   * {@inheritdoc}
   */
  protected static $modules = [
    'jsonapi',
    'field',
    'node',
    'serialization',
    'system',
    'taxonomy',
    'text',
    'filter',
    'user',
    'file',
    'image',
    'jsonapi_test_normalizers_kernel',
    'jsonapi_test_resource_type_building',
  ];
  
  /**
   * A node to normalize.
   *
   * @var \Drupal\Core\Entity\EntityInterface
   */
  protected $node;
  
  /**
   * The node type.
   *
   * @var \Drupal\node\Entity\NodeType
   */
  protected NodeType $nodeType;
  
  /**
   * A user to normalize.
   *
   * @var \Drupal\user\Entity\User
   */
  protected $user;
  
  /**
   * A user.
   *
   * @var \Drupal\user\Entity\User
   */
  protected User $user2;
  
  /**
   * A vocabulary.
   *
   * @var \Drupal\taxonomy\Entity\Vocabulary
   */
  protected Vocabulary $vocabulary;
  
  /**
   * A term.
   *
   * @var \Drupal\taxonomy\Entity\Term
   */
  protected Term $term1;
  
  /**
   * A term.
   *
   * @var \Drupal\taxonomy\Entity\Term
   */
  protected Term $term2;
  
  /**
   * The include resolver.
   *
   * @var \Drupal\jsonapi\IncludeResolver
   */
  protected $includeResolver;
  
  /**
   * The JSON:API resource type repository under test.
   *
   * @var \Drupal\jsonapi\ResourceType\ResourceTypeRepository
   */
  protected $resourceTypeRepository;
  
  /**
   * @var \Drupal\file\Entity\File
   */
  private $file;
  
  /**
   * {@inheritdoc}
   */
  protected function setUp() : void {
    parent::setUp();
    // Add the entity schemas.
    $this->installEntitySchema('node');
    $this->installEntitySchema('user');
    $this->installEntitySchema('taxonomy_term');
    $this->installEntitySchema('file');
    // Add the additional table schemas.
    $this->installSchema('node', [
      'node_access',
    ]);
    $this->installSchema('user', [
      'users_data',
    ]);
    $this->installSchema('file', [
      'file_usage',
    ]);
    $type = NodeType::create([
      'type' => 'article',
      'name' => 'Article',
    ]);
    $type->save();
    $this->createEntityReferenceField('node', 'article', 'field_tags', 'Tags', 'taxonomy_term', 'default', [
      'target_bundles' => [
        'tags',
      ],
    ], FieldStorageDefinitionInterface::CARDINALITY_UNLIMITED);
    $this->createTextField('node', 'article', 'body', 'Body');
    $this->createImageField('field_image', 'node', 'article');
    $this->user = User::create([
      'name' => 'user1',
      'mail' => 'user@localhost',
    ]);
    $this->user2 = User::create([
      'name' => 'user2',
      'mail' => 'user2@localhost',
    ]);
    $this->user
      ->save();
    $this->user2
      ->save();
    $this->vocabulary = Vocabulary::create([
      'name' => 'Tags',
      'vid' => 'tags',
    ]);
    $this->vocabulary
      ->save();
    $this->term1 = Term::create([
      'name' => 'term1',
      'vid' => $this->vocabulary
        ->id(),
    ]);
    $this->term2 = Term::create([
      'name' => 'term2',
      'vid' => $this->vocabulary
        ->id(),
    ]);
    $this->term1
      ->save();
    $this->term2
      ->save();
    $this->file = File::create([
      'uri' => 'public://example.png',
      'filename' => 'example.png',
    ]);
    $this->file
      ->save();
    $this->node = Node::create([
      'title' => 'dummy_title',
      'type' => 'article',
      'uid' => $this->user,
      'body' => [
        'format' => 'plain_text',
        'value' => $this->randomString(),
      ],
      'field_tags' => [
        [
          'target_id' => $this->term1
            ->id(),
        ],
        [
          'target_id' => $this->term2
            ->id(),
        ],
      ],
      'field_image' => [
        [
          'target_id' => $this->file
            ->id(),
          'alt' => 'test alt',
          'title' => 'test title',
          'width' => 10,
          'height' => 11,
        ],
      ],
    ]);
    $this->node
      ->save();
    $this->nodeType = NodeType::load('article');
    Role::create([
      'id' => RoleInterface::ANONYMOUS_ID,
      'permissions' => [
        'access content',
      ],
      'label' => 'Anonymous',
    ])->save();
    $this->includeResolver = $this->container
      ->get('jsonapi.include_resolver');
    $this->resourceTypeRepository = $this->container
      ->get('jsonapi.resource_type.repository');
  }
  
  /**
   * {@inheritdoc}
   */
  protected function tearDown() : void {
    if ($this->node) {
      $this->node
        ->delete();
    }
    if ($this->term1) {
      $this->term1
        ->delete();
    }
    if ($this->term2) {
      $this->term2
        ->delete();
    }
    if ($this->vocabulary) {
      $this->vocabulary
        ->delete();
    }
    if ($this->user) {
      $this->user
        ->delete();
    }
    if ($this->user2) {
      $this->user2
        ->delete();
    }
    parent::tearDown();
  }
  
  /**
   * @covers ::normalize
   */
  public function testNormalize() : void {
    $resource_type = $this->container
      ->get('jsonapi.resource_type.repository')
      ->get('node', 'article');
    $resource_object = ResourceObject::createFromEntity($resource_type, $this->node);
    $includes = $this->includeResolver
      ->resolve($resource_object, 'uid,field_tags,field_image');
    $jsonapi_doc_object = $this->getNormalizer()
      ->normalize(new JsonApiDocumentTopLevel(new ResourceObjectData([
      $resource_object,
    ], 1), $includes, new LinkCollection([])), 'api_json', [
      'resource_type' => $resource_type,
      'account' => NULL,
      'sparse_fieldset' => [
        'node--article' => [
          'title',
          'node_type',
          'uid',
          'field_tags',
          'field_image',
        ],
        'user--user' => [
          'display_name',
        ],
      ],
      'include' => [
        'uid',
        'field_tags',
        'field_image',
      ],
    ]);
    $normalized = $jsonapi_doc_object->getNormalization();
    // @see http://jsonapi.org/format/#document-jsonapi-object
    $this->assertEquals('1.0', $normalized['jsonapi']['version']);
    $this->assertEquals('http://jsonapi.org/format/1.0/', $normalized['jsonapi']['meta']['links']['self']['href']);
    $this->assertSame($normalized['data']['attributes']['title'], 'dummy_title');
    $this->assertEquals($normalized['data']['id'], $this->node
      ->uuid());
    $this->assertSame([
      'data' => [
        'type' => 'node_type--node_type',
        'id' => NodeType::load('article')->uuid(),
        'meta' => [
          'drupal_internal__target_id' => 'article',
        ],
      ],
      'links' => [
        'related' => [
          'href' => Url::fromUri('internal:/jsonapi/node/article/' . $this->node
            ->uuid() . '/node_type', [
            'query' => [
              'resourceVersion' => 'id:' . $this->node
                ->getRevisionId(),
            ],
          ])
            ->setAbsolute()
            ->toString(TRUE)
            ->getGeneratedUrl(),
        ],
        'self' => [
          'href' => Url::fromUri('internal:/jsonapi/node/article/' . $this->node
            ->uuid() . '/relationships/node_type', [
            'query' => [
              'resourceVersion' => 'id:' . $this->node
                ->getRevisionId(),
            ],
          ])
            ->setAbsolute()
            ->toString(TRUE)
            ->getGeneratedUrl(),
        ],
      ],
    ], $normalized['data']['relationships']['node_type']);
    $this->assertTrue(!isset($normalized['data']['attributes']['created']));
    $this->assertEquals([
      'alt' => 'test alt',
      'title' => 'test title',
      'width' => 10,
      'height' => 11,
      'drupal_internal__target_id' => $this->file
        ->id(),
    ], $normalized['data']['relationships']['field_image']['data']['meta']);
    $this->assertSame('node--article', $normalized['data']['type']);
    $this->assertEquals([
      'data' => [
        'type' => 'user--user',
        'id' => $this->user
          ->uuid(),
        'meta' => [
          'drupal_internal__target_id' => $this->user
            ->id(),
        ],
      ],
      'links' => [
        'self' => [
          'href' => Url::fromUri('internal:/jsonapi/node/article/' . $this->node
            ->uuid() . '/relationships/uid', [
            'query' => [
              'resourceVersion' => 'id:' . $this->node
                ->getRevisionId(),
            ],
          ])
            ->setAbsolute()
            ->toString(TRUE)
            ->getGeneratedUrl(),
        ],
        'related' => [
          'href' => Url::fromUri('internal:/jsonapi/node/article/' . $this->node
            ->uuid() . '/uid', [
            'query' => [
              'resourceVersion' => 'id:' . $this->node
                ->getRevisionId(),
            ],
          ])
            ->setAbsolute()
            ->toString(TRUE)
            ->getGeneratedUrl(),
        ],
      ],
    ], $normalized['data']['relationships']['uid']);
    $this->assertArrayNotHasKey('meta', $normalized);
    $this->assertSame($this->user
      ->uuid(), $normalized['included'][0]['id']);
    $this->assertSame('user--user', $normalized['included'][0]['type']);
    $this->assertSame('user1', $normalized['included'][0]['attributes']['display_name']);
    $this->assertCount(1, $normalized['included'][0]['attributes']);
    $this->assertSame($this->term1
      ->uuid(), $normalized['included'][1]['id']);
    $this->assertSame('taxonomy_term--tags', $normalized['included'][1]['type']);
    $this->assertSame($this->term1
      ->label(), $normalized['included'][1]['attributes']['name']);
    $this->assertCount(11, $normalized['included'][1]['attributes']);
    $this->assertTrue(!isset($normalized['included'][1]['attributes']['created']));
    // Make sure that the cache tags for the includes and the requested entities
    // are bubbling as expected.
    $this->assertEqualsCanonicalizing([
      'file:1',
      'node:1',
      'taxonomy_term:1',
      'taxonomy_term:2',
      'user:1',
    ], $jsonapi_doc_object->getCacheTags());
    $this->assertSame(Cache::PERMANENT, $jsonapi_doc_object->getCacheMaxAge());
  }
  
  /**
   * @covers ::normalize
   */
  public function testNormalizeUuid() : void {
    $resource_type = $this->container
      ->get('jsonapi.resource_type.repository')
      ->get('node', 'article');
    $resource_object = ResourceObject::createFromEntity($resource_type, $this->node);
    $include_param = 'uid,field_tags';
    $includes = $this->includeResolver
      ->resolve($resource_object, $include_param);
    $document_wrapper = new JsonApiDocumentTopLevel(new ResourceObjectData([
      $resource_object,
    ], 1), $includes, new LinkCollection([]));
    $jsonapi_doc_object = $this->getNormalizer()
      ->normalize($document_wrapper, 'api_json', [
      'resource_type' => $resource_type,
      'account' => NULL,
      'include' => [
        'uid',
        'field_tags',
      ],
    ]);
    $normalized = $jsonapi_doc_object->getNormalization();
    $this->assertStringMatchesFormat($this->node
      ->uuid(), $normalized['data']['id']);
    $this->assertEquals($this->node->type->entity
      ->uuid(), $normalized['data']['relationships']['node_type']['data']['id']);
    $this->assertEquals($this->user
      ->uuid(), $normalized['data']['relationships']['uid']['data']['id']);
    $this->assertNotEmpty($normalized['included'][0]['id']);
    $this->assertArrayNotHasKey('meta', $normalized);
    $this->assertEquals($this->user
      ->uuid(), $normalized['included'][0]['id']);
    $this->assertCount(1, $normalized['included'][0]['attributes']);
    $this->assertCount(11, $normalized['included'][1]['attributes']);
    // Make sure that the cache tags for the includes and the requested entities
    // are bubbling as expected.
    $this->assertEqualsCanonicalizing([
      'node:1',
      'taxonomy_term:1',
      'taxonomy_term:2',
      'user:1',
    ], $jsonapi_doc_object->getCacheTags());
  }
  
  /**
   * @covers ::normalize
   */
  public function testNormalizeException() : void {
    $normalized = $this->container
      ->get('jsonapi.serializer')
      ->normalize(new JsonApiDocumentTopLevel(new ErrorCollection([
      new BadRequestHttpException('Lorem'),
    ]), new NullIncludedData(), new LinkCollection([])), 'api_json', [])
      ->getNormalization();
    $this->assertNotEmpty($normalized['errors']);
    $this->assertArrayNotHasKey('data', $normalized);
    $this->assertEquals(400, $normalized['errors'][0]['status']);
    $this->assertEquals('Lorem', $normalized['errors'][0]['detail']);
    $this->assertEquals([
      'info' => [
        'href' => 'http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.4.1',
      ],
      'via' => [
        'href' => 'http://localhost/',
      ],
    ], $normalized['errors'][0]['links']);
  }
  
  /**
   * Tests the message and exceptions when requesting a Label only resource.
   */
  public function testAliasFieldRouteException() : void {
    $this->assertSame('uid', $this->resourceTypeRepository
      ->getByTypeName('node--article')
      ->getPublicName('uid'));
    $this->assertSame('roles', $this->resourceTypeRepository
      ->getByTypeName('user--user')
      ->getPublicName('roles'));
    $resource_type_field_aliases = [
      'node--article' => [
        'uid' => 'author',
      ],
      'user--user' => [
        'roles' => 'user_roles',
      ],
    ];
    \Drupal::state()->set('jsonapi_test_resource_type_builder.resource_type_field_aliases', $resource_type_field_aliases);
    Cache::invalidateTags([
      'jsonapi_resource_types',
    ]);
    $this->assertSame('author', $this->resourceTypeRepository
      ->getByTypeName('node--article')
      ->getPublicName('uid'));
    $this->assertSame('user_roles', $this->resourceTypeRepository
      ->getByTypeName('user--user')
      ->getPublicName('roles'));
    // Create the request to fetch the articles and fetch included user.
    $resource_type = $this->container
      ->get('jsonapi.resource_type.repository')
      ->get('node', 'article');
    $user = User::load($this->node
      ->getOwnerId());
    $resource_object = ResourceObject::createFromEntity($resource_type, $this->node);
    $user_resource_type = $this->container
      ->get('jsonapi.resource_type.repository')
      ->get('user', 'user');
    $resource_object_user = LabelOnlyResourceObject::createFromEntity($user_resource_type, $user);
    $includes = $this->includeResolver
      ->resolve($resource_object_user, 'user_roles');
    /** @var \Drupal\jsonapi\Normalizer\Value\CacheableNormalization $jsonapi_doc_object */
    $jsonapi_doc_object = $this->getNormalizer()
      ->normalize(new JsonApiDocumentTopLevel(new ResourceObjectData([
      $resource_object,
      $resource_object_user,
    ], 2), $includes, new LinkCollection([])), 'api_json', [
      'resource_type' => $resource_type,
      'account' => NULL,
      'sparse_fieldset' => [
        'node--article' => [
          'title',
          'node_type',
          'uid',
        ],
        'user--user' => [
          'user_roles',
        ],
      ],
      'include' => [
        'user_roles',
      ],
    ])
      ->getNormalization();
    $this->assertNotEmpty($jsonapi_doc_object['meta']['omitted']);
    foreach ($jsonapi_doc_object['meta']['omitted']['links'] as $key => $link) {
      if (str_starts_with($key, 'item--')) {
        // Ensure that resource link contains URL with the alias field.
        $resource_link = Url::fromUri('internal:/jsonapi/user/user/' . $user->uuid() . '/user_roles')
          ->setAbsolute()
          ->toString(TRUE);
        $this->assertEquals($resource_link->getGeneratedUrl(), $link['href']);
        $this->assertEquals("The current user is not allowed to view this relationship. The user only has authorization for the 'view label' operation.", $link['meta']['detail']);
      }
    }
  }
  
  /**
   * @covers ::normalize
   */
  public function testNormalizeConfig() : void {
    $resource_type = $this->container
      ->get('jsonapi.resource_type.repository')
      ->get('node_type', 'node_type');
    $resource_object = ResourceObject::createFromEntity($resource_type, $this->nodeType);
    $document_wrapper = new JsonApiDocumentTopLevel(new ResourceObjectData([
      $resource_object,
    ], 1), new NullIncludedData(), new LinkCollection([]));
    $jsonapi_doc_object = $this->getNormalizer()
      ->normalize($document_wrapper, 'api_json', [
      'resource_type' => $resource_type,
      'account' => NULL,
      'sparse_fieldset' => [
        'node_type--node_type' => [
          'description',
          'display_submitted',
        ],
      ],
    ]);
    $normalized = $jsonapi_doc_object->getNormalization();
    $this->assertSame([
      'description',
      'display_submitted',
    ], array_keys($normalized['data']['attributes']));
    $this->assertSame($normalized['data']['id'], NodeType::load('article')->uuid());
    $this->assertSame($normalized['data']['type'], 'node_type--node_type');
    // Make sure that the cache tags for the includes and the requested entities
    // are bubbling as expected.
    $this->assertSame([
      'config:node.type.article',
    ], $jsonapi_doc_object->getCacheTags());
  }
  
  /**
   * Try to POST a node and check if it exists afterwards.
   *
   * @covers ::denormalize
   */
  public function testDenormalize() : void {
    $payload = '{"data":{"type":"article","attributes":{"title":"Testing article"}}}';
    $resource_type = $this->container
      ->get('jsonapi.resource_type.repository')
      ->get('node', 'article');
    $node = $this->getNormalizer()
      ->denormalize(Json::decode($payload), NULL, 'api_json', [
      'resource_type' => $resource_type,
    ]);
    $this->assertInstanceOf(Node::class, $node);
    $this->assertSame('Testing article', $node->getTitle());
  }
  
  /**
   * Try to POST a node and check if it exists afterwards.
   *
   * @covers ::denormalize
   */
  public function testDenormalizeUuid() : void {
    $configurations = [
      // Good data.
[
        [
          [
            $this->term2
              ->uuid(),
            $this->term1
              ->uuid(),
          ],
          $this->user2
            ->uuid(),
        ],
        [
          [
            $this->term2
              ->id(),
            $this->term1
              ->id(),
          ],
          $this->user2
            ->id(),
        ],
      ],
      // Good data, without any tags.
[
        [
          [],
          $this->user2
            ->uuid(),
        ],
        [
          [],
          $this->user2
            ->id(),
        ],
      ],
      // Bad data in first tag.
[
        [
          [
            'invalid-uuid',
            $this->term1
              ->uuid(),
          ],
          $this->user2
            ->uuid(),
        ],
        [
          [
            $this->term1
              ->id(),
          ],
          $this->user2
            ->id(),
        ],
        'taxonomy_term--tags:invalid-uuid',
      ],
      // Bad data in user and first tag.
[
        [
          [
            'invalid-uuid',
            $this->term1
              ->uuid(),
          ],
          'also-invalid-uuid',
        ],
        [
          [
            $this->term1
              ->id(),
          ],
          NULL,
        ],
        'user--user:also-invalid-uuid',
      ],
    ];
    foreach ($configurations as $configuration) {
      [
        $payload_data,
        $expected,
      ] = $this->denormalizeUuidProviderBuilder($configuration);
      $payload = Json::encode($payload_data);
      $resource_type = $this->container
        ->get('jsonapi.resource_type.repository')
        ->get('node', 'article');
      try {
        $node = $this->getNormalizer()
          ->denormalize(Json::decode($payload), NULL, 'api_json', [
          'resource_type' => $resource_type,
        ]);
      } catch (NotFoundHttpException $e) {
        $non_existing_resource_identifier = $configuration[2];
        $this->assertEquals("The resource identified by `{$non_existing_resource_identifier}` (given as a relationship item) could not be found.", $e->getMessage());
        continue;
      }
      /** @var \Drupal\node\Entity\Node $node */
      $this->assertInstanceOf(Node::class, $node);
      $this->assertSame('Testing article', $node->getTitle());
      if (!empty($expected['user_id'])) {
        $owner = $node->getOwner();
        $this->assertEquals($expected['user_id'], $owner->id());
      }
      $tags = $node->get('field_tags')
        ->getValue();
      if (!empty($expected['tag_ids'][0])) {
        $this->assertEquals($expected['tag_ids'][0], $tags[0]['target_id']);
      }
      else {
        $this->assertArrayNotHasKey(0, $tags);
      }
      if (!empty($expected['tag_ids'][1])) {
        $this->assertEquals($expected['tag_ids'][1], $tags[1]['target_id']);
      }
      else {
        $this->assertArrayNotHasKey(1, $tags);
      }
    }
  }
  
  /**
   * Tests denormalization for related resources with missing or invalid types.
   */
  public function testDenormalizeInvalidTypeAndNoType() : void {
    $payload_data = [
      'data' => [
        'type' => 'node--article',
        'attributes' => [
          'title' => 'Testing article',
          'id' => '33095485-70D2-4E51-A309-535CC5BC0115',
        ],
        'relationships' => [
          'uid' => [
            'data' => [
              'type' => 'user--user',
              'id' => $this->user2
                ->uuid(),
            ],
          ],
          'field_tags' => [
            'data' => [
              [
                'type' => 'foobar',
                'id' => $this->term1
                  ->uuid(),
              ],
            ],
          ],
        ],
      ],
    ];
    // Test relationship member with invalid type.
    $payload = Json::encode($payload_data);
    $resource_type = $this->container
      ->get('jsonapi.resource_type.repository')
      ->get('node', 'article');
    try {
      $this->getNormalizer()
        ->denormalize(Json::decode($payload), NULL, 'api_json', [
        'resource_type' => $resource_type,
      ]);
      $this->fail('No assertion thrown for invalid type');
    } catch (BadRequestHttpException $e) {
      $this->assertEquals("Invalid type specified for related resource: 'foobar'", $e->getMessage());
    }
    // Test relationship member with no type.
    unset($payload_data['data']['relationships']['field_tags']['data'][0]['type']);
    $payload = Json::encode($payload_data);
    $resource_type = $this->container
      ->get('jsonapi.resource_type.repository')
      ->get('node', 'article');
    try {
      $this->container
        ->get('jsonapi_test_normalizers_kernel.jsonapi_document_toplevel')
        ->denormalize(Json::decode($payload), NULL, 'api_json', [
        'resource_type' => $resource_type,
      ]);
      $this->fail('No assertion thrown for missing type');
    } catch (BadRequestHttpException $e) {
      $this->assertEquals("No type specified for related resource", $e->getMessage());
    }
  }
  
  /**
   * We cannot use a PHPUnit data provider because our data depends on $this.
   *
   * @param array $options
   *   Options for how to construct test data.
   *
   * @return array
   *   The test data.
   */
  protected function denormalizeUuidProviderBuilder(array $options) {
    [
      $input,
      $expected,
    ] = $options;
    [
      $input_tag_uuids,
      $input_user_uuid,
    ] = $input;
    [
      $expected_tag_ids,
      $expected_user_id,
    ] = $expected;
    $node = [
      [
        'data' => [
          'type' => 'node--article',
          'attributes' => [
            'title' => 'Testing article',
          ],
          'relationships' => [
            'uid' => [
              'data' => [
                'type' => 'user--user',
                'id' => $input_user_uuid,
              ],
            ],
            'field_tags' => [
              'data' => [],
            ],
          ],
        ],
      ],
      [
        'tag_ids' => $expected_tag_ids,
        'user_id' => $expected_user_id,
      ],
    ];
    if (isset($input_tag_uuids[0])) {
      $node[0]['data']['relationships']['field_tags']['data'][0] = [
        'type' => 'taxonomy_term--tags',
        'id' => $input_tag_uuids[0],
      ];
    }
    if (isset($input_tag_uuids[1])) {
      $node[0]['data']['relationships']['field_tags']['data'][1] = [
        'type' => 'taxonomy_term--tags',
        'id' => $input_tag_uuids[1],
      ];
    }
    return $node;
  }
  
  /**
   * Ensure that cacheability metadata is properly added.
   *
   * @param \Drupal\Core\Cache\CacheableMetadata $expected_metadata
   *   The expected cacheable metadata.
   *
   * @dataProvider testCacheableMetadataProvider
   */
  public function testCacheableMetadata(CacheableMetadata $expected_metadata) : void {
    $resource_type = $this->container
      ->get('jsonapi.resource_type.repository')
      ->get('node', 'article');
    $resource_object = ResourceObject::createFromEntity($resource_type, $this->node);
    $context = [
      'resource_type' => $resource_type,
      'account' => NULL,
    ];
    $jsonapi_doc_object = $this->getNormalizer()
      ->normalize(new JsonApiDocumentTopLevel(new ResourceObjectData([
      $resource_object,
    ], 1), new NullIncludedData(), new LinkCollection([])), 'api_json', $context);
    foreach ($expected_metadata->getCacheTags() as $tag) {
      $this->assertContains($tag, $jsonapi_doc_object->getCacheTags());
    }
    foreach ($expected_metadata->getCacheContexts() as $context) {
      $this->assertContains($context, $jsonapi_doc_object->getCacheContexts());
    }
    $this->assertSame($expected_metadata->getCacheMaxAge(), $jsonapi_doc_object->getCacheMaxAge());
  }
  
  /**
   * Provides test cases for asserting cacheable metadata behavior.
   */
  public static function testCacheableMetadataProvider() {
    $cacheable_metadata = function ($metadata) {
      return CacheableMetadata::createFromRenderArray([
        '#cache' => $metadata,
      ]);
    };
    return [
      [
        $cacheable_metadata([
          'contexts' => [
            'languages:language_interface',
          ],
        ]),
        [
          'node--article' => 'body',
        ],
      ],
    ];
  }
  
  /**
   * Helper to load the normalizer.
   */
  protected function getNormalizer() {
    $normalizer_service = $this->container
      ->get('jsonapi_test_normalizers_kernel.jsonapi_document_toplevel');
    // Simulate what happens when this normalizer service is used via the
    // serializer service, as it is meant to be used.
    $normalizer_service->setSerializer($this->container
      ->get('jsonapi.serializer'));
    return $normalizer_service;
  }

}