Python Testing with pytest

Exercises

Fixtures are often one of the trickier parts of pytest for people to get used to. Going through the following exercises will

• help solidify your understanding of how fixtures work,
• allow you to use different fixture scopes, and
• internalize the run sequence with the visual output of --setup-show.

1. Create a test file called test_fixtures.py.

2. Write a few data fixtures—functions with the @pytest.fixture() decorator—that return some data (perhaps a list, dictionary, or tuple).

3. For each fixture, write at least one test function that uses it.

4. Write two tests that use the same fixture.

5. Run pytest --setup-show test_fixtures.py. Are all the fixtures run before every test?

6. Add scope=’module’ to the fixture from Exercise 4.

7. Re-run pytest --setup-show ...