Skill: pytest

Best practices for writing and organizing tests with pytest including fixtures, parametrize, and plugins.

When to Use

Apply this skill when writing and organizing tests with pytest — fixtures, parametrize, markers, plugins, and test structure.

Test Organization

• Place tests in a tests/ directory mirroring the source structure.
• Name test files test_<module>.py and test functions test_<behavior>().
• Group related tests in classes only when they share fixtures/setup.

Fixtures

• Define fixtures at the narrowest scope needed (function > class > module > session).
• Use conftest.py for shared fixtures; put it at the appropriate directory level.
• Prefer factory fixtures over complex fixture inheritance.