core-tdd

The red-green-refactor cycle in test-driven development enforces writing a failing test first, implementing minimal code to pass it, then refactoring safely. This workflow reduces bugs by ensuring tests define behavior before implementation across TypeScript and JavaScript projects.

The best way to start test-driven development for a new TypeScript feature is to select a small feature scope and run the red-green-refactor loop. You drive implementation by writing failing unit tests first, then introducing minimal code to satisfy them.

Yes, you can apply test-driven development best practices for JavaScript unit testing and refactoring. It provides comprehensive guidelines including AAA patterns, mocks, and parameterized tests to ensure clean, maintainable code during feature introduction.

Common mistakes to avoid when writing unit tests before implementation include skipping the refactor phase or writing tests after the code. Following strict test-first development rules prevents these errors and ensures code quality remains high.

Test-driven development works seamlessly across both TypeScript and JavaScript projects. It standardizes unit testing, refactoring, and feature introduction scenarios with explicit rules and educational examples tailored for these specific ecosystems.