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pytest-tips-tricks

A primer on pytest

Introduction to Testing with pytest

• Why Test?
  • Does anything work?
  • Why PyTest?
• Setup Cloud Development Environments with Local CI and Compare:
  • Github Codespaces
  • AWS Cloud9
  • AWS Cloudshell
• CI Systems with PyTest
  • Github Actions: https://docs.github.com/actions/automating-builds-and-tests/building-and-testing-nodejs-or-python?langId=py
  • AWS Code Build

Invoking pytest

• Overview of pytest invocation
• Simple version: make test via python -m pytest -vv test_hello.py
• Adding Code Coverage: pytest-cov python -m pytest -vv --cov=hello test_hello.py
  • Coverage Invoke Snippit
• Adding Jupyter Notebook testing:
  • nbval: https://github.com/computationalmodelling/nbval
  • nbval
• Debugging Code with PDB
  • What is PDB and how does it work?
  • Alternative IPDB[https://pypi.org/project/ipdb/]
  • Invoke pytest with --pdb: https://github.com/paiml/testing-in-python/blob/master/chapter6/Makefile#L2
• Stop on fail:
  • pytest -x
  • pytest --maxfail=2
• Specify Tests: https://docs.pytest.org/en/6.2.x/usage.html?highlight=pdb#specifying-tests-selecting-tests
  • dir
  • keyword
• Build a report: https://docs.pytest.org/en/6.2.x/usage.html?highlight=pdb#detailed-summary-report

Advanced pytest

• Setup and Teardown
• Testing Click CLI
• Testing Flask API
• Testing FastAPI

References

• To use caching use this option: https://github.com/actions/cache/blob/main/examples.md#python---pip

Watch the pytest master class

• Watch on YouTube
• Watch on O'Reilly