Tests don't run under Python 2.7 (unittest._WritelnDecorator has moved)

[Andrew Bennetts]

bzrlib/tests/__init__.py tries to access unittest._WritelnDecorator, but this doesn't exist in (unreleased) Python 2.7's unittest module.

The hackish fix is to try importing _WritelnDecorator from unittest.runner (where it can be found in 2.7). A better fix would be to stop relying on non-public attributes, perhaps by convincing Python to expose this useful class somewhere public? Or perhaps put this functionality into testtools?

[Andrew Bennetts (spiv)]

Also, we use unittest._TextTestResult, which is still provided but deprecated in 2.7. The preferred name in 2.7 is unittest.TextTestResult.

[Martin Packman (gz)]

Can address these particular incompatibilities by just not using _WritelnDecorator, and depending on the testtools TextTestResult rather than the unittest one.

There seem to be some deeper issues with the many unittest changes in Python 2.7 though, particularly from implementing a bunch of the same extensions bzrlib has but in a slightly different manner. Have added a known failure for bug 607400 and worked around bug 607412 for the moment.

[Martin Packman (gz)]

Committed on bzr.dev in r5372 as a side effect of dependent branch landing.