test-driven-development

The Red-Green-Refactor cycle in test-driven development is a workflow where you write a failing test, implement minimal code to pass it, and then refactor for quality to ensure robust code.

To avoid testing anti-patterns when writing unit tests, follow strict guardrails against mocking behavior instead of state and prevent polluting production code with test-only methods.

You should use test-driven development for all feature implementations and bug fixes to guarantee every line of production code is backed by a failing test, ensuring high confidence and preventing regressions.

The best way to start implementing a new feature using TDD is to write the first failing test case for the specific module, such as user authentication, before writing any production code.

Refactoring code without tests leads to hidden bugs because there are no failing tests to enforce strict verification, resulting in fragile code that lacks documentation and reliability.