Test-Driven Development

Test-Driven Development is a Quality skill for Claude Code, published by LerianStudio in ring.

210 stars27 forkson LerianStudio/ringAdded 2026/09/04Repository updated 2026/08/19

ai-agentsai-codingclaude-codecode-qualitycode-reviewdeveloper-toolsdevopsfinopspluginprompt-engineeringskills-librarysoftware-engineeringtddtechnical-writingworkflow-automation

Install in seconds

Install Test-Driven Development

Copy Test-Driven Development into your Claude Code skills folder. Run the command in your terminal, or review the source on GitHub before installing.

terminal

npx degit https://github.com/LerianStudio/ring/tree/main/default/skills/test-driven-development ~/.claude/skills/test-driven-development

Requires Node.js. Downloads this skill only — not the rest of the repository — into your Claude Code skills folder.

Without Node.js

git clone https://github.com/LerianStudio/ring.git

Clones the whole repository, then copy the skill’s own directory into your skills folder yourself.

In this catalog

Source file: default/skills/test-driven-development/SKILL.md in LerianStudio/ring
Installs to: ~/.claude/skills/test-driven-development
Collection: One of 25 skills cataloged from this repository
Category: Quality — 1557 skills

What Test-Driven Development does

Test-Driven Development enforces the red-green-refactor loop for new features, bugfixes, and new production code. Write a failing test first, then minimal code to pass, and refactor only after green.

Test-Driven Development is cataloged under Quality on DirSkills. Test-Driven Development comes from a repository tagged ai-agents, ai-coding, claude-code, code-quality and code-review.

Documentation

README

Excerpt

Test-Driven Development (TDD)

When to use

Starting implementation of new feature
Starting implementation of bugfix
Writing new production code

Skip when

Reviewing/modifying existing tests
Exploratory/spike work — TDD is for known requirements, not exploration.

Write the test first. Watch it fail. Write minimal code to pass.

Core principle: If you didn't watch the test fail, you don't know if it tests the right thing.

The Iron Law

NO PRODUCTION CODE WITHOUT A FAILING TEST FIRST

RED → GREEN → REFACTOR

RED: Write Failing Test

Write one minimal test showing what should happen. Name describes behavior. Tests real code (not mocks unless unavoidable).

Time limit: <5 minutes. Complex setup = design too complex.

This is the opening of the README. Read the full README on GitHub.

Frequently asked about Test-Driven Development

What else does LerianStudio publish alongside Test-Driven Development?
Test-Driven Development is one of 25 skills that DirSkills catalogs from LerianStudio/ring, the repository it ships in. Its siblings there include Adopt The Huma OpenAPI Wrapper, Analyzing Options and Cleaning Comments. Each one is a separate skill with its own page in this directory, installs the same way Test-Driven Development does, and is maintained by LerianStudio in that same repository. The rest of the collection is listed on the LerianStudio/ring page.
How does Test-Driven Development compare to other Quality skills?
Test-Driven Development ranks #1440 by stars among the 1557 Quality skills in this catalog. The most-starred ones next to it are Benchmark, Benchmark Optimization Loop and API Design Patterns. DirSkills ranks by the star count of the repository each skill ships in, so that order reflects how popular those repositories are rather than any review of Test-Driven Development against them. Open each page to compare what they document and how they install.