NormalizableTraversableDummy example

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()
    {
        $this->expectException(UnexpectedValueException::class);
        $serializer = new Serializer([new TestDenormalizer()], []);
        $this->assertTrue($serializer->normalize(new \stdClass(), 'json'));
    }

    public function testDenormalizeNoMatch()
    {

        $this->encoder = new XmlEncoder();
        $serializer = new Serializer([new CustomNormalizer()], ['xml' => new XmlEncoder()]);
        $this->encoder->setSerializer($serializer);

        $expected = <<<'XML' <?xml version="1.0"?> <response><foo>normalizedFoo</foo><bar>normalizedBar</bar></response> XML;

        $this->assertEquals($expected, $serializer->serialize(new NormalizableTraversableDummy(), 'xml'));
    }

    public function testDecode()
    {
        $source = $this->getXmlSource();
        $obj = $this->getObject();

        $this->assertEquals(get_object_vars($obj), $this->encoder->decode($source, 'xml'));
    }

    public function testDecodeCdataWrapping()
    {