| Function | udiff_lines | Undocumented |
| Function | external_udiff_lines | Undocumented |
| Class | TestDiff | No class docstring; 4/15 methods documented |
| Class | TestDiffFiles | No class docstring; 1/1 methods documented |
| Function | get_diff_as_string | Undocumented |
| Class | TestDiffDates | No class docstring; 2/7 methods documented |
| Class | TestShowDiffTrees | Direct tests for show_diff_trees |
| Class | DiffWasIs | Undocumented |
| Class | TestDiffTree | Undocumented |
| Class | TestPatienceDiffLib | No class docstring; 1/12 methods documented |
| Class | TestPatienceDiffLib_c | No class docstring; 1/2 methods documented |
| Class | TestPatienceDiffLibFiles | Undocumented |
| Class | TestPatienceDiffLibFiles_c | Undocumented |
| Class | TestUsingCompiledIfAvailable | Undocumented |
| Class | TestDiffFromTool | Undocumented |
| Class | TestDiffFromToolEncodedFilename | Undocumented |
| Class | TestGetTreesAndBranchesToDiffLocked | No class docstring; 1/3 methods documented |