How do I run all Python unit tests in a directory?

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With Python 2.7 and higher you don’t have to write new code or use third-party tools to do this; recursive test execution via the command line is built-in. Put an __init__.py in your test directory and:

python -m unittest discover <test_directory>
# or
python -m unittest discover -s <directory> -p '*_test.py'

You can read more in the python 2.7
or python 3.x unittest documentation.

Update for 2021:

Lots of modern python projects use more advanced tools like pytest. For example, pull down matplotlib or scikit-learn and you will see they both use it.

It is important to know about these newer tools because when you have more than 7000 tests you need:

  • more advanced ways to summarize what passes, skipped, warnings, errors
  • easy ways to see how they failed
  • percent complete as it is running
  • total run time
  • ways to generate a test report
  • etc etc

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