def setUp(self):
   self._http_signaler = mox.MockObject(HttpSignaler)
   self._status_health_check = StatusHealthCheck()
   self._http_health_check = HttpHealthCheck(self._http_signaler)
   self._smart_health_check = InstanceWatcherHealthCheck(self._http_signaler)
   self._health_check_a = mox.MockObject(HealthCheck)
   self._health_check_b = mox.MockObject(HealthCheck)