tdd-guidelines

To prevent test expectations from breaking during refactoring, apply an expect-immutability rule that treats expect statements as golden behavioral contracts, ensuring refactors change internal structure without altering observable behavior.

The correct test pyramid priority structures tests by prioritizing Feature tests first, then Integration tests, and finally Unit tests to balance feedback speed and confidence during iterative development.

Select the right test doubles by choosing the lowest-level double that enables principled isolation when needed, aligning with established test-doubles theory to keep tests reliable and maintainable.

Yes, MSW supports test-driven development by providing request and response mocking patterns for APIs, enabling reliable front-end testing for transport-driven UI behavior.

You should follow the Red-Green-Refactor loop when building new features or refactoring code, starting with a failing test, writing minimum code to pass, and improving structure without changing behavior.

Behavior drift occurs during iterative coding when changes unintentionally alter existing functionality; TDD prevents it by enforcing a strict workflow that keeps changes behavior-preserving and expectations trustworthy.