class ChainEntityResolverTest

class ChainEntityResolverTest extends UnitTestCase {
    
    /**
     * A mocked normalizer.
     *
     * @var \Symfony\Component\Serializer\Normalizer\NormalizerInterface|\PHPUnit\Framework\MockObject\MockObject
     */
    protected $testNormalizer;
    
    /**
     * Test data passed to the resolve method.
     *
     * @var object
     */
    protected $testData;
    
    /**
     * A test entity type.
     *
     * @var string
     */
    protected $testEntityType = 'test_type';
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() : void {
        parent::setUp();
        $this->testNormalizer = $this->createMock('Symfony\\Component\\Serializer\\Normalizer\\NormalizerInterface');
        $this->testData = new \stdClass();
    }
    
    /**
     * Tests the resolve method with no matching resolvers.
     *
     * @covers ::__construct
     * @covers ::resolve
     */
    public function testResolverWithNoneResolved() : void {
        $resolvers = [
            $this->createEntityResolverMock(),
            $this->createEntityResolverMock(),
        ];
        $resolver = new ChainEntityResolver($resolvers);
        $this->assertNull($resolver->resolve($this->testNormalizer, $this->testData, $this->testEntityType));
    }
    
    /**
     * Tests the resolve method with no matching resolvers, using addResolver.
     *
     * @covers ::addResolver
     * @covers ::resolve
     */
    public function testResolverWithNoneResolvedUsingAddResolver() : void {
        $resolver = new ChainEntityResolver();
        $resolver->addResolver($this->createEntityResolverMock());
        $resolver->addResolver($this->createEntityResolverMock());
        $this->assertNull($resolver->resolve($this->testNormalizer, $this->testData, $this->testEntityType));
    }
    
    /**
     * Tests the resolve method with a matching resolver first.
     *
     * @covers ::__construct
     * @covers ::resolve
     */
    public function testResolverWithFirstResolved() : void {
        $resolvers = [
            $this->createEntityResolverMock(10),
            $this->createEntityResolverMock(NULL, FALSE),
        ];
        $resolver = new ChainEntityResolver($resolvers);
        $this->assertSame(10, $resolver->resolve($this->testNormalizer, $this->testData, $this->testEntityType));
    }
    
    /**
     * Tests the resolve method with a matching resolver last.
     *
     * @covers ::__construct
     * @covers ::resolve
     */
    public function testResolverWithLastResolved() : void {
        $resolvers = [
            $this->createEntityResolverMock(),
            $this->createEntityResolverMock(10),
        ];
        $resolver = new ChainEntityResolver($resolvers);
        $this->assertSame(10, $resolver->resolve($this->testNormalizer, $this->testData, $this->testEntityType));
    }
    
    /**
     * Tests the resolve method where one resolver returns 0.
     *
     * @covers ::__construct
     * @covers ::resolve
     */
    public function testResolverWithResolvedToZero() : void {
        $resolvers = [
            $this->createEntityResolverMock(0),
            $this->createEntityResolverMock(NULL, FALSE),
        ];
        $resolver = new ChainEntityResolver($resolvers);
        $this->assertSame(0, $resolver->resolve($this->testNormalizer, $this->testData, $this->testEntityType));
    }
    
    /**
     * Creates a mock entity resolver.
     *
     * @param null|int $return
     *   Whether the mocked resolve method should return TRUE or FALSE.
     * @param bool $called
     *   Whether or not the resolve method is expected to be called.
     *
     * @return \Drupal\serialization\EntityResolver\EntityResolverInterface|\PHPUnit\Framework\MockObject\MockObject
     *   The mocked entity resolver.
     */
    protected function createEntityResolverMock($return = NULL, $called = TRUE) {
        $mock = $this->createMock('Drupal\\serialization\\EntityResolver\\EntityResolverInterface');
        if ($called) {
            $mock->expects($this->once())
                ->method('resolve')
                ->with($this->testNormalizer, $this->testData, $this->testEntityType)
                ->willReturn($return);
        }
        else {
            $mock->expects($this->never())
                ->method('resolve');
        }
        return $mock;
    }

}