These failures are not something that you would want to encounter in a real flight (meaning flying a real RC instead of a simulator). They are there to make you do a ground check before flying your plane. As if someone came up before you, like maybe an instructor, and messed with something on your radio. Then, hopefully, you would find it during a pre-flight BEFORE you fly. Obviously, if you fly with the channel reversed, for instance, especially ailerons, you would be in for an interesting surprize.