Test-Driven Development

by testdouble

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

253 stars22 forkson testdouble/hanAdded 2026/09/02+9% in starsRepository updated 2026/09/01

View source on GitHub Download repo ZIP

claudeclaude-codeclaude-code-pluginclaude-skillscode-reviewdocumentationinvestigationplanningreview

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/testdouble/han/tree/main/han-coding/skills/tdd ~/.claude/skills/tdd

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/testdouble/han.git

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

In this catalog

Source file: han-coding/skills/tdd/SKILL.md in testdouble/han
Installs to: ~/.claude/skills/tdd
Collection: One of 25 skills cataloged from this repository
Category: Quality — 1418 skills

What Test-Driven Development does

Test-Driven Development writes code through a test-first red-green-refactor loop with an observed-failure gate. Use it to implement features behavior by behavior from tests, including TPP or ZOMBIES ordering.

Test-Driven Development is cataloged under Quality on DirSkills. Test-Driven Development comes from a repository tagged claude, claude-code, claude-code-plugin, claude-skills and code-review.

Documentation

README

Excerpt

Project Context

git installed: !which git 2>/dev/null || echo "not installed"
current branch: !git branch --show-current 2>/dev/null || echo unknown
CLAUDE.md: !find . -maxdepth 1 -name "CLAUDE.md" -type f
project-discovery.md: !find . -maxdepth 3 -name "project-discovery.md" -type f
personal config directory: !bash "${CLAUDE_PLUGIN_ROOT}/scripts/han-config-dir.sh" 2>/dev/null || echo "$HOME/.claude"
project .han/config.md: !cat .han/config.md 2>/dev/null || echo ""

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

Commands Test-Driven Development provides

Slash commands named in this skill’s SKILL.md, listed in the order they first appear.

/investigate

Frequently asked about Test-Driven Development

What else does testdouble publish alongside Test-Driven Development?
Test-Driven Development is one of 25 skills that DirSkills catalogs from testdouble/han, the repository it ships in. Its siblings there include Architectural Analysis, Automated Test Planning and Code Overview. 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 testdouble in that same repository. The rest of the collection is listed on the testdouble/han page.
How does Test-Driven Development compare to other Quality skills?
Test-Driven Development ranks #1288 by stars among the 1418 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.