class SerializerTest

class SerializerTest extends JsonapiKernelTestBase {
    
    /**
     * {@inheritdoc}
     */
    protected static $modules = [
        'serialization',
        'system',
        'node',
        'user',
        'field',
        'text',
        'filter',
        'jsonapi_test_data_type',
    ];
    
    /**
     * An entity for testing.
     *
     * @var \Drupal\Core\Entity\EntityInterface
     */
    protected $node;
    
    /**
     * A resource type for testing.
     *
     * @var \Drupal\jsonapi\ResourceType\ResourceType
     */
    protected $resourceType;
    
    /**
     * The subject under test.
     *
     * @var \Drupal\jsonapi\Serializer\Serializer
     */
    protected $sut;
    
    /**
     * A user.
     *
     * @var \Drupal\user\Entity\User
     */
    protected $user;
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() : void {
        parent::setUp();
        // Add the entity schemas.
        $this->installEntitySchema('node');
        $this->installEntitySchema('user');
        // Add the additional table schemas.
        $this->installSchema('system', [
            'sequences',
        ]);
        $this->installSchema('node', [
            'node_access',
        ]);
        $this->installSchema('user', [
            'users_data',
        ]);
        $this->user = User::create([
            'name' => $this->randomString(),
            'status' => 1,
        ]);
        $this->user
            ->save();
        NodeType::create([
            'type' => 'foo',
        ])->save();
        $this->createTextField('node', 'foo', 'field_text', 'Text');
        $this->node = Node::create([
            'title' => 'Test Node',
            'type' => 'foo',
            'field_text' => [
                'value' => 'This is some text.',
                'format' => 'text_plain',
            ],
            'uid' => $this->user
                ->id(),
        ]);
        $this->node
            ->save();
        $this->container
            ->setAlias('sut', 'jsonapi.serializer');
        $this->resourceType = $this->container
            ->get('jsonapi.resource_type.repository')
            ->get($this->node
            ->getEntityTypeId(), $this->node
            ->bundle());
        $this->sut = $this->container
            ->get('sut');
    }
    
    /**
     * @covers \Drupal\jsonapi\Serializer\Serializer::normalize
     */
    public function testFallbackNormalizer() {
        $context = [
            'account' => $this->user,
            'resource_object' => ResourceObject::createFromEntity($this->resourceType, $this->node),
        ];
        $value = $this->sut
            ->normalize($this->node->field_text, 'api_json', $context);
        $this->assertInstanceOf(CacheableNormalization::class, $value);
        $nested_field = [
            $this->node->field_text,
        ];
        // When an object implements \IteratorAggregate and has corresponding
        // fallback normalizer, it should be normalized by fallback normalizer.
        $traversableObject = new TraversableObject();
        $value = $this->sut
            ->normalize($traversableObject, 'api_json', $context);
        $this->assertEquals($traversableObject->property, $value);
        // When wrapped in an array, we should still be using the JSON:API
        // serializer.
        $value = $this->sut
            ->normalize($nested_field, 'api_json', $context);
        $this->assertInstanceOf(CacheableNormalization::class, $value[0]);
        // Continue to use the fallback normalizer when we need it.
        $data = Markup::create('<h2>Test Markup</h2>');
        $value = $this->sut
            ->normalize($data, 'api_json', $context);
        $this->assertEquals('<h2>Test Markup</h2>', $value);
    }

}