class LinkCollectionNormalizerTest

class LinkCollectionNormalizerTest extends KernelTestBase {
    use UserCreationTrait;
    
    /**
     * The serializer.
     *
     * @var \Symfony\Component\Serializer\SerializerInterface
     */
    protected $serializer;
    
    /**
     * The subject under test.
     *
     * @var \Drupal\jsonapi\Normalizer\LinkCollectionNormalizer
     */
    protected $normalizer;
    
    /**
     * Test users.
     *
     * @var \Drupal\user\UserInterface[]
     */
    protected $testUsers;
    
    /**
     * {@inheritdoc}
     */
    protected static $modules = [
        'file',
        'jsonapi',
        'serialization',
        'system',
        'user',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() : void {
        parent::setUp();
        // Add the entity schemas.
        $this->installEntitySchema('user');
        // Add the additional table schemas.
        $this->installSchema('user', [
            'users_data',
        ]);
        // Set the user IDs to something higher than 1 so these users cannot be
        // mistaken for the site admin.
        $this->testUsers[] = $this->createUser([], NULL, FALSE, [
            'uid' => 2,
        ]);
        $this->testUsers[] = $this->createUser([], NULL, FALSE, [
            'uid' => 3,
        ]);
        $this->serializer = $this->container
            ->get('jsonapi.serializer');
    }
    
    /**
     * Tests the link collection normalizer.
     */
    public function testNormalize() : void {
        $link_context = new ResourceObject(new CacheableMetadata(), new ResourceType('n/a', 'n/a', 'n/a'), 'n/a', NULL, [], new LinkCollection([]));
        $link_collection = (new LinkCollection([]))->withLink('related', new Link(new CacheableMetadata(), Url::fromUri('http://example.com/post/42'), 'related', [
            'title' => 'Most viewed',
        ]))
            ->withLink('related', new Link(new CacheableMetadata(), Url::fromUri('http://example.com/post/42'), 'related', [
            'title' => 'Top rated',
        ]))
            ->withContext($link_context);
        // Create the SUT.
        $normalized = $this->getNormalizer()
            ->normalize($link_collection)
            ->getNormalization();
        $this->assertIsArray($normalized);
        foreach (array_keys($normalized) as $key) {
            $this->assertStringStartsWith('related', $key);
        }
        $this->assertSame([
            [
                'href' => 'http://example.com/post/42',
                'meta' => [
                    'title' => 'Most viewed',
                ],
            ],
            [
                'href' => 'http://example.com/post/42',
                'meta' => [
                    'title' => 'Top rated',
                ],
            ],
        ], array_values($normalized));
    }
    
    /**
     * Tests the link collection normalizer.
     *
     * @dataProvider linkAccessTestData
     */
    public function testLinkAccess($current_user_id, $edit_form_uid, $expected_link_keys, $expected_cache_contexts) : void {
        // Get the current user and an edit-form URL.
        foreach ($this->testUsers as $user) {
            $uid = (int) $user->id();
            if ($uid === $current_user_id) {
                $current_user = $user;
            }
            if ($uid === $edit_form_uid) {
                $edit_form_url = $user->toUrl('edit-form');
            }
        }
        assert(isset($current_user));
        assert(isset($edit_form_url));
        // Create a link collection to normalize.
        $mock_resource_object = $this->createMock(ResourceObject::class);
        $link_collection = new LinkCollection([
            'edit-form' => new Link(new CacheableMetadata(), $edit_form_url, 'edit-form', [
                'title' => 'Edit',
            ]),
        ]);
        $link_collection = $link_collection->withContext($mock_resource_object);
        // Normalize the collection.
        $actual_normalization = $this->getNormalizer($current_user)
            ->normalize($link_collection);
        // Check that it returned the expected value object.
        $this->assertInstanceOf(CacheableNormalization::class, $actual_normalization);
        // Get the raw normalized data.
        $actual_data = $actual_normalization->getNormalization();
        $this->assertIsArray($actual_data);
        // Check that the expected links are present and unexpected links are
        // absent.
        $actual_link_keys = array_keys($actual_data);
        sort($expected_link_keys);
        sort($actual_link_keys);
        $this->assertSame($expected_link_keys, $actual_link_keys);
        // Check that the expected cache contexts were added.
        $actual_cache_contexts = $actual_normalization->getCacheContexts();
        sort($expected_cache_contexts);
        sort($actual_cache_contexts);
        $this->assertSame($expected_cache_contexts, $actual_cache_contexts);
        // If the edit-form link was present, check that it has the correct href.
        if (isset($actual_data['edit-form'])) {
            $this->assertSame($actual_data['edit-form'], [
                'href' => $edit_form_url->setAbsolute()
                    ->toString(),
                'meta' => [
                    'title' => 'Edit',
                ],
            ]);
        }
    }
    
    /**
     * Provides test cases for testing link access checking.
     *
     * @return array[]
     */
    public static function linkAccessTestData() {
        return [
            'the edit-form link is present because uid 2 has access to the targeted resource (its own edit form)' => [
                'current_user_id' => 2,
                'edit_form_uid' => 2,
                'expected_link_keys' => [
                    'edit-form',
                ],
                'expected_cache_contexts' => [
                    'url.site',
                    'user',
                ],
            ],
            "the edit-form link is omitted because uid 3 doesn't have access to the targeted resource (another account's edit form)" => [
                'current_user_id' => 3,
                'edit_form_uid' => 2,
                'expected_link_keys' => [],
                'expected_cache_contexts' => [
                    'url.site',
                    'user',
                ],
            ],
        ];
    }
    
    /**
     * Get an instance of the normalizer to test.
     */
    protected function getNormalizer(?AccountInterface $current_user = NULL) {
        if (is_null($current_user)) {
            $current_user = $this->setUpCurrentUser();
        }
        else {
            $this->setCurrentUser($current_user);
        }
        $normalizer = new LinkCollectionNormalizer($current_user);
        $normalizer->setSerializer($this->serializer);
        return $normalizer;
    }

}