test-driven-development

Test-driven development prevents code regressions and improves maintainability by forcing you to write tests before implementation. It ensures robust, well-tested code by addressing common anti-patterns and rationalizations that undermine software quality.

Start writing code using TDD principles by writing a failing test for the new feature before any implementation. Write the minimal code required to pass that test, then refactor the codebase while ensuring the test stays green.

Test-driven development requires a failing test first to validate that the test actually checks the intended logic and to prevent writing unnecessary production code. This Iron Law ensures every line of code is justified and prevents regressions.

Yes, you can use test-driven development for agile refactoring. The TDD cycle explicitly includes a refactoring phase, allowing you to safely improve code structure and quality while maintaining a passing test suite to prevent regressions.

Common anti-patterns that undermine TDD include rationalizing skipping the failing test phase or writing excessive code beyond what the test requires. TDD identifies these pitfalls and enforces strict adherence to the Red-Green-Refactor cycle to ensure code quality.