Track 13 · Lesson 7 of 12

Fixtures, setup and test isolation

Share setup between tests with pytest fixtures, clean up with yield, use temporary files, and keep every test independent.

You will be able to

• Explain why tests must not depend on each other or on shared mutable state
• Write a pytest fixture and request it from tests by parameter name
• Use yield in a fixture to run cleanup code after each test
• Test file-handling code with the built-in tmp_path fixture