public function testHasResponseType()
 {
     // infers in the constructor
     $o = new Operation(array('responseClass' => 'array'));
     $this->assertEquals('primitive', $o->getResponseType());
     // Infers when set
     $o = new Operation();
     $this->assertEquals('primitive', $o->getResponseType());
     $this->assertEquals('model', $o->setResponseType('model')->getResponseType());
 }