ros-simulation#408 If I don't launch gazebo, and have the test return…

… success immediately, the test doesn't run out of time. I'm guessing gazebo isn't shutting down properly at the end of the test?

gazebo_plugins/test/camera/camera.cpp

@@ -59,6 +59,7 @@ TEST_F(CameraTest, cameraSubscribeTest)
   double time_diff = (ros::Time::now() - image_stamp_).toSec();
   ROS_INFO_STREAM(time_diff);
   EXPECT_LT(time_diff, 0.5);
+  cam_sub_.shutdown();
 }
 
 int main(int argc, char** argv)