Pytest Testing Standards

REFERENCE MODE: This skill provides reference material for writing pytest tests. Load standards on-demand based on current task.

Enforcement

Execution mode: Reference library; load standards on-demand for Python testing tasks.

Prohibited actions:

• Do not use unittest.TestCase for new tests; use plain pytest functions
• Do not share mutable state between tests without fixture isolation
• Do not use os.chdir() without restoration (use monkeypatch.chdir())

Constraints:

• Tests must follow AAA (Arrange-Act-Assert) pattern
• Each test must be independent and isolated
• Fixtures must use appropriate scope (function/module/session)
• Working directory changes must be restored after each test