public function testToIdentifierReturnsResourceIdentifier()
{
$data = (object) ['id' => '123', 'foo' => 'bar'];
$resource = new Resource($data, new PostSerializer4());
$this->assertEquals(['type' => 'posts', 'id' => '123'], $resource->toIdentifier());
$resource->addMeta('foo', 'bar');
$this->assertEquals(['type' => 'posts', 'id' => '123', 'meta' => ['foo' => 'bar']], $resource->toIdentifier());
}
