| Class | OldBzrDir | An test bzr dir implementation |
| Class | ConvertOldTestToMeta | A trivial converter, used for testing. |
| Class | OldBzrDirFormat | Undocumented |
| Class | TestWithUpgradableBranches | No class docstring; 1/17 methods documented |
| Class | SFTPTests | Tests for upgrade over sftp. |
| Class | UpgradeRecommendedTests | Undocumented |