Session Initialization Protocol tests.
| Class | TestRealm | Undocumented |
| Class | MessageParsingTests | No class docstring; 2/10 methods documented |
| Class | MessageParsingFeedDataCharByCharTests | Same as base class, but feed data char by char. |
| Class | MakeMessageTests | Undocumented |
| Class | ViaTests | No class docstring; 6/10 methods documented |
| Class | URLTests | Undocumented |
| Class | ParseTests | Undocumented |
| Class | DummyLocator | Undocumented |
| Class | FailingLocator | Undocumented |
| Class | ProxyTests | Undocumented |
| Class | RegistrationTests | Undocumented |
| Class | Client | Undocumented |
| Class | LiveTests | No class docstring; 1/4 methods documented |