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TDD loop (Matt Pocock)

Skill
submitted by u/client to c/backend · 0 uses

A compact red-green-refactor guide focused on good tests, seams and avoiding mocks.

Used when you want to build or fix something test-first. It defines what a good test looks like, where test seams belong, which anti-patterns to avoid (especially heavy mocking), and the rules of the loop. Extra notes cover mocking and test style. Short and opinionated, from Matt Pocock's widely used skills collection.

Try asking:

  • "Build the cart total function test-first"
  • "Fix this bug with red-green-refactor"
  • "Add integration tests for the signup flow"

Source: mattpocock/skills · MIT · by Matt Pocock

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Install this skill

Skills are folders with a SKILL.md file. Claude loads one on its own when a task matches its description. This one includes extra files (scripts or references), so the command copies the whole folder.

Claude Code plugin (easiest, stays up to date)
/plugin marketplace add mattpocock/skills
/plugin install mattpocock-skills@mattpocock
Claude Code: for every project
npx degit mattpocock/skills/skills/engineering/tdd ~/.claude/skills/tdd
Claude Code: this project only (commit it to share with your team)
npx degit mattpocock/skills/skills/engineering/tdd .claude/skills/tdd
View SKILL.mdSource

Made by Matt Pocock, MIT license. Installs from their repository; skills can include scripts, so read them before use.

In the Claude apps, zip the folder and upload it under Settings → Capabilities → Skills.

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