test-driven-development

Test-driven development is a software development methodology where you write failing tests before implementation code, ensuring behavior is defined upfront and preventing bugs before they are introduced to enable confident refactoring.

To implement the Red-Green-Refactor cycle, write a failing test that specifies the desired outcome, write minimal code to make that test pass, and then clean up the implementation while ensuring the test still passes.

Writing failing tests before implementation forces you to define expected behavior clearly, prevents regressions by ensuring code quality from the start, and enables confident refactoring without breaking existing functionality.

TDD addresses common rationalizations and anti-patterns by enforcing a rigorous testing methodology that requires minimal code to pass tests, preventing over-engineering and ensuring software reliability throughout the development process.

Yes, test-driven development enables confident refactoring by ensuring existing tests validate behavior before and after code changes, preventing regressions while improving code quality and structure during agile software development.

TDD requires strict adherence to the Red-Green-Refactor cycle, which may slow initial feature delivery, and demands rigorous discipline to avoid common anti-patterns that compromise the testing methodology's effectiveness.