test-driven-development

Test-driven development for bug fixes uses the Prove-It pattern to reproduce the bug with a failing test before changing production code. You write a deterministic test that validates the expected behavior, then implement the smallest change to make it pass.

The TDD workflow follows RED, GREEN, and REFACTOR steps. You write a failing test first, implement minimal code to make the test pass, then refactor while keeping tests green to ensure robust behavior and traceable design decisions.

Start unit and integration testing by writing a failing test for the specific feature scenario. Maintain a clear test pyramid to guide ongoing development, ensuring deterministic validation and minimal changes that guard against regressions.

Yes, test-first development applies to refactors by ensuring robust tests guard against regressions. You write deterministic tests to validate existing behavior before making minimal changes, keeping the implementation lean and traceable throughout the process.

Test-driven development requires a failing test first to enforce concrete requirements and validate behavior. This RED step ensures the test actually checks the feature or bug fix, preventing false positives and driving minimal, traceable design decisions.

The best way to validate behavior is through deterministic unit and integration tests. By maintaining a clear test pyramid and following the GREEN and REFACTOR steps, you ensure tests stay green and continuously validate the expected behavior.