TraversableDummy example

public function testNormalizeNoMatch()
    {
        $this->expectException(UnexpectedValueException::class);
        $serializer = new Serializer([$this->createMock(CustomNormalizer::class)]);
        $serializer->normalize(new \stdClass(), 'xml');
    }

    public function testNormalizeTraversable()
    {
        $serializer = new Serializer([], ['json' => new JsonEncoder()]);
        $result = $serializer->serialize(new TraversableDummy(), 'json');
        $this->assertEquals('{"foo":"foo","bar":"bar"}', $result);
    }

    public function testNormalizeGivesPriorityToInterfaceOverTraversable()
    {
        $serializer = new Serializer([new CustomNormalizer()], ['json' => new JsonEncoder()]);
        $result = $serializer->serialize(new NormalizableTraversableDummy(), 'json');
        $this->assertEquals('{"foo":"normalizedFoo","bar":"normalizedBar"}', $result);
    }

    public function testNormalizeOnDenormalizer()
    {