Unittest2

Unittest2 is a backport of the enhanced features from Python 2.7's `unittest` module to earlier Python versions (primarily Python 2.4-2.6, but later extending to 2.x and early 3.x versions). It provided modern `unittest` capabilities like improved assertion methods, test discovery, class/module-level fixtures, and `assertRaises` as a context manager for users on older Python environments. The project's last release was in 2015, making it largely obsolete for modern Python development.