| Class | HTTPServerTestSetup | Undocumented |
| Class | TestProberProtocolAndFactory | No class docstring; 1/19 methods documented |
| Class | FakeTimeOutCall | Undocumented |
| Class | FakeTransport | Undocumented |
| Class | FakeFactory | Undocumented |
| Class | TestProberFactoryRequestTimeoutRatioWithoutTwisted | Tests to ensure we stop issuing requests on a given host if the |
| Class | TestProberFactoryRequestTimeoutRatioWithTwisted | Tests to ensure we stop issuing requests on a given host if the |
| Class | TestMultiLock | No class docstring; 4/6 methods documented |
| Class | TestRedirectAwareProberFactoryAndProtocol | Undocumented |
| Class | TestMirrorCDImageProberCallbacks | Undocumented |
| Class | TestArchiveMirrorProberCallbacks | Undocumented |
| Class | TestProbeFunctionSemaphores | Make sure we use one DeferredSemaphore for each hostname when probing |
| Class | TestCDImageFileListFetching | Undocumented |
| Class | TestLoggingMixin | Undocumented |