Python Testing with pytest

Review

We’ve covered a lot in this chapter and are well on our way to testing the Cards application.

• The sample code should be downloaded into /path/to/code.

• The Cards application (and pytest) is installed into a virtual environment with the following steps:

  • cd /path/to/code
  • python -m venv venv --prompt cards
  • source venv/bin/activate (or venv\Scripts\activate.bat on Windows)
  • pip install ./cards_proj
  • pip install pytest

• pytest uses assert rewriting, which allows us to use standard Python assert expressions.

• Tests can fail from assertion failures, from calls to fail(), or from any uncaught exception.

• pytest.raises() is used to test for expected exceptions.

• A great way to structure tests is called Given-When-Then or Arrange-Act-Assert.

• Classes can ...