tdd-workflow

Test-Driven Development converts requirements into executable tests by applying the RED-GREEN-REFACTOR cycle. You first write a failing test demonstrating desired behavior, implement minimal code to pass it, then refactor while keeping all tests green.

The best way to structure unit tests is using the AAA (Arrange, Act, Assert) organization. This standardizes tests to focus on behavior, edge cases, and error states, making results clear, repeatable, and easy to maintain during implementation.

To fix a bug using the RED-GREEN-REFACTOR cycle, write a failing test that demonstrates the defect or desired behavior. Implement the minimum code required to turn the failing test green, then refactor the structure without breaking correctness.

Yes, Test-Driven Development works for building new features and complex logic. It structures tests around behavior and error states, enforcing YAGNI-driven minimal implementation to reduce ambiguity and increase coverage throughout incremental development.

You should reconsider Test-Driven Development for software design when requirements are highly ambiguous and cannot be structured into executable tests, as the process depends on defining clear behavior, edge cases, and error states before implementation.

The TDD workflow enforces YAGNI-driven minimal implementation to prevent over-engineering. By writing only the code needed to satisfy the current failing test, you avoid unnecessary complexity and keep the test suite maintainable.