public function testTypeAndId()
{
$identifier = new ResourceIdentifier();
$this->assertFalse($identifier->hasType());
$this->assertFalse($identifier->hasId());
$identifier = ResourceIdentifier::create(self::TYPE, self::ID);
$this->assertSame(self::TYPE, $identifier->getType());
$this->assertTrue($identifier->hasType());
$this->assertSame(self::ID, $identifier->getId());
$this->assertTrue($identifier->hasId());
return $identifier;
}