Pytest plugin that allows the user to select the tests affected by a given range of git commits. A file is considered affected when:

• It was added/modified in between the commits.
• It imports another affected file.

pip install pytest-git-diff

This plugin adds 2 options to the pytest CLI:

• --only-affected-by: filters the collected tests, keeping only those affected by the given commit range. This range should be in the format FROM_REV..TO_REV. If TO_REV is omitted, it defaults to 'HEAD'.
• --only-affected-last-commit: has the same effect as --only-affected-by=HEAD~1..HEAD.

The main limitation in this plugin is that file paths must be valid Python identifier names (in particular, they can't contain dashes). That applies to every part of the path up to the working directory in which pytest was invoked.

This issue stems from a problem in the pydeps dependency. See thebjorn/pydeps#24.