Fix test_native to fail on error response
Fix test_native to fail on error response

Ref:
* https://github.com/cherrypy/cherrypy/pull/1712/files#diff-38455dfb545934fdb8aaae27bbfd32adR33

Safihre/cherrypy,cherrypy/cherrypy,Safihre/cherrypy,cherrypy/cherrypy