pytest-best-practices

<essential_principles>

Test Independence

• Each test must run in isolation - no shared state between tests
• Use fixtures for setup/teardown, never class-level mutable state
• Tests should pass regardless of execution order

Naming Conventions

• Files: test_*.py or *_test.py
• Functions: test_<description>()
• Classes: Test<ClassName>
• Fixtures: descriptive lowercase_with_underscores