tdd-fundamentals

Red-Green-Refactor (RGR) is a TDD pattern where you write a failing test (red), write minimal code to pass it (green), then improve the code (refactor). This Skill teaches RGR fundamentals with baby steps—small, incremental changes—across TypeScript/JavaScript projects using Jest or Vitest, enabling fast feedback loops and maintainable test-first workflows.

The AAA pattern—Arrange, Act, Assert—structures tests by setting up data (arrange), executing the code (act), and verifying results (assert). This Skill covers AAA fundamentals as a core test-design technique to write clear, focused tests that validate one behavior at a time in your TypeScript/JavaScript codebase.

Yes. This Skill applies TDD practices to feature development and bug-fix cycles using Jest or Vitest test runners. It covers test scaffolding generation from specs, skip/active test modes for focused development, and RGRC patterns—Red, Green, Refactor, Commit—to support incremental, test-first workflows in TypeScript/JavaScript projects.

Baby steps are small, deliberate code changes that keep feedback cycles short and reduce complexity. This Skill teaches baby-steps methodology within TDD to help teams—especially beginners—master the Red-Green-Refactor cycle, maintain test coverage, and commit frequently with confidence across TypeScript/JavaScript codebases.

RGRC adds a Commit step after Refactor, creating a disciplined checkpoint in the TDD cycle. This Skill teaches Red-Green-Refactor-Commit (RGRC) as a complete workflow that integrates version control, ensuring each passing, refactored test is saved as an atomic, reviewable unit in your development process.