Contributing to nose2

Please do! nose2 cannot move forward without contributions from the testing community.

If you’re unsure how to get started, feel free to ask for help from the nose2 community via the mailing list. We welcome contributors with all levels of experience.

The Basics

nose2 is hosted on github. Our home there is We use github’s issue tracking and collaboration tools exclusively for managing nose2’s development. This means:

Coding Guidelines

The main rule is: any patch that touches code should include tests. And of course all tests should pass under all supported versions of Python.

If you aren’t sure how to add tests, or you don’t know why existing tests fail on your changes, submit your patch and ask for help testing it.

Tests are easy to run. Just install tox (pip install tox), and run tox in the nose2 root directory. You can also use make test to easily install and run tox correctly.

Some additional tips for the python and documentation in this project.

  • Code should be pep8 compliant
  • Where possible, write code which passes pyflakes linting (consider using flake8 to do pyflakes and pep8 checking)
  • For consistency with unittest please use CamelCase for class names, methods, attributes and function parameters that map directly to class attributes.
  • Try to use raw strings for docstrings – ensures that ReST won’t be confused by characters like \\
  • For complex functionality, include sample usage in docstrings

Workflow, Branching and Pull Requests

The basic workflow should be to do the work in a topic branch in your fork then post a pull request for that branch.

For any pull request,

  • Make sure it meets the standards set in this document
  • Make sure it merges cleanly
  • List any issues closed by the pull request
  • Squash intermediate commits. Consider using git rebase --interactive to squash typo fixes, aborted implementations, etc.

Reporting Bugs

The best bug reports are ones which:

  • Check for duplicates. Do a quick search to try to make sure you aren’t reporting a known bug
  • Use a clear descriptive title
  • Explain what behavior you expected.
  • Provide a specific example of how to reproduce. Example code, the command(s) you ran, and anything else which may be relevant
  • Include a stacktrace where applicable

In many cases, you can help by including the following information:

  • What version of python are you running?
  • What OS and OS version are you running? uname -a output helps, but additional description like “Ubuntu Linux 17.10” may be useful too
  • What other python packages do you have installed? The best thing in this case is to show us the results of pip freeze

If you are willing and able, write a failing test.

Requesting Enhancements

When requesting new features,

  • Say why you want it. Focus more on the problem which needs to be solved than the specifics of how to solve it
  • Suggest what you think is the easiest implementation path. If you have an idea about how a feature could be implemented, write it down
  • Volunteer to write it! nose2 is maintained as a community effort. If you want a new feature, the best way to get it added is to write it yourself!