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