public function not_acceptable_with_message()
 {
     $r = Response::notAcceptable('Cannot upload files named four-our-six');
     $this->assertEquals(new Payload('Cannot upload files named four-our-six'), $r->payload);
 }
 public function not_acceptable()
 {
     $r = Response::notAcceptable();
     $this->assertEquals(406, $r->status);
 }