JoeGaebel

JoeGaebel / outside-in-tdd-starter

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Outside-In TDD Claude Code workflow starter app

16
3
100% credibility
Found Mar 18, 2026 at 16 stars -- GitGems finds repos before they trend. Get early access to the next one.
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AI Analysis
TypeScript
AI Summary

A sandbox todo app and starter template for using an AI-assisted outside-in test-driven development workflow to build reliable web applications layer by layer.

How It Works

1
🕵️ Discover the Starter Kit

You find a helpful guide on GitHub for building apps with an AI buddy that ensures everything works perfectly from the user's view first.

2
💻 Prepare Your Computer

You install a few free programs like a container manager, a web runtime, and a special AI coding helper to get ready.

3
📥 Download the Playground

You bring the example todo app home to your computer and set it up with simple steps.

4
🚀 Launch the Todo App

You start the app and its helpers with one easy command, and soon see your basic todo playground running smoothly on your screen.

5
💭 Chat with Your AI Buddy

You open the AI helper right in your app folder and describe a fun new feature, like a button to switch between light and dark themes.

6
⚡ Watch It Build Step by Step

The AI plans the feature, creates user checks first, then builds and improves layer by layer until your new feature works perfectly across the whole app.

🎉 Enjoy Your Reliable App

Your todo app now has the new feature fully tested and ready, and you can customize the kit to build whatever you dream up next.

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Star Growth

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AI-Generated Review

What is outside-in-tdd-starter?

This TypeScript starter kit sets up an outside-in TDD workflow inside Claude Code, turning feature requests into fully tested apps via outside-in diamond TDD—starting with E2E tests and drilling down through layers like frontend and backend. It's a runnable todo app sandbox for immediate experimentation, plus a template you clone to kick off your own project with TDD outside in vs inside out from day zero. Built on Next.js, React, Prisma, and Cypress, it handles Dockerized Postgres, auth, and mutation testing out of the box.

Why is it gaining traction?

Unlike manual TDD primers like "Outside In React Development: A TDD Primer" (or its PDF), this automates the full cycle in Claude Code: plan a feature, write failing E2E tests, then RED-GREEN-REFACTOR per layer until verified. Developers hook it by prompting Claude—like "implement dark mode toggle"—and watch it build, test, and mutate-kill without handoffs. The adaptable registry for layers and skills makes it a workflow booster for AI-driven coding.

Who should use this?

Solo devs or small teams prototyping React/TypeScript apps with Claude Code, especially those shifting from inside-out to outside-in TDD. Outside collaborators in GitHub building shared starters, or consultants templating client projects needing instant E2E-to-unit coverage. Skip if you're not using Anthropic's CLI.

Verdict

Grab it if you're into Claude-powered TDD workflows—docs guide adaptation perfectly, even for custom stacks. At 16 stars and 1.0% credibility, it's raw and niche, but battle-tested for todo-to-real-app evolution; fork and contribute to mature it.

(198 words)

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