Write Unit Tests Using PyTest in Python

Things on this page are fragmentary and immature notes/thoughts of the author. Please read with your own judgement!

Run pytest in the root directory of your project to run all test suites. You can run test cases in a specific test file (e.g., test_file.py) using the command pytest test_file.py. You can run a specific test (e.g., test_func) in a test file (e.g., test_func) using pytest test_file.py -k test_func. you can also pass parameters to a test function using pytest test_file.py:::test_func[0-0-0-invalid].

pytest import mechanisms and sys.path/PYTHONPATH¶

--tb=short --lf (last failure)

Markers¶

@pytest.mark.foo where foo can be any arbitrary string you like, e.g., @pytest.mark.slow tells pytest that the marked test takes a long time to run.

pytest.mark.skipif

http://doc.pytest.org/en/latest/reference.html#pytest-mark-skip-ref

http://doc.pytest.org/en/latest/skipping.html

https://stackoverflow.com/questions/38442897/how-do-i-disable-a-test-using-py-test

Capturing of the stdout/stderr output¶

You can disable all capturing using the -s option (which is equivalent to --capture=no).

pytest -s

For more details, please refer to Capturing of the stdout/stderr output .

Parameterized Tests¶

Talk: Brian K Okken - Multiply your Testing Effectiveness with Parameterized Testing

Plugins¶

https://github.com/ClearcodeHQ/pytest-elasticsearch

https://github.com/ClearcodeHQ/pytest-postgresql

https://github.com/ClearcodeHQ/pytest-dynamodb

https://github.com/ClearcodeHQ/pytest-rabbitmq

https://github.com/ClearcodeHQ/pytest-mysql

https://github.com/ClearcodeHQ/pytest-redis

https://github.com/ClearcodeHQ/pytest-mongo

References¶

Good Integration Practices

Changing standard (Python) test discovery¶

Is there a way to specify which pytest tests to run from a file?

https://medium.com/python-in-plain-english/unit-testing-in-python-structure-57acd51da923