Test case for twisted.protocols.loopback.
| Class | SimpleProtocol | Undocumented |
| Class | DoomProtocol | Undocumented |
| Class | LoopbackTestCaseMixin | Undocumented |
| Class | LoopbackAsyncTests | No class docstring; 17/18 methods documented |
| Class | LoopbackTCPTests | Undocumented |
| Class | LoopbackUNIXTests | Undocumented |
| Class | LoopbackRelayTest | Test for twisted.protocols.loopback.LoopbackRelay |