tdd

Test-driven development follows a structured red-green-refactor cycle: write a failing test first, implement minimal code to pass it, then refactor with confidence. This Skill guides you through each phase with language-agnostic patterns for Python (pytest/unittest) and Emacs Lisp (ERT), ensuring disciplined iteration and safe code changes.

Yes. This Skill provides language-agnostic TDD guidance covering Python and Emacs Lisp, with test design patterns like AAA and Given-When-Then that apply broadly. You adapt the red-green-refactor cycle to your language's testing framework while maintaining the same disciplined workflow.

TDD employs structured test design patterns including AAA (Arrange-Act-Assert), Given-When-Then, and boundary and edge-case coverage strategies. These patterns ensure comprehensive test suites that catch corner cases early and guide minimal implementation that satisfies all test conditions.

This Skill integrates the red-green-refactor cycle into CI pipelines by structuring build, test, and refactor actions as one framework. You write failing tests, implement code, refactor safely, and maintain a passing test suite within your continuous integration environment.

Writing tests first clarifies requirements, prevents over-engineering, and provides immediate feedback on your design. The red-green-refactor cycle ensures you implement only what's needed to pass tests, then refactor with a safety net, reducing bugs and improving code quality.