tdd-approach

Enforce red-green-refactor cycles with failing tests before implementation.

1|Updated Feb 24, 2026

Search Tags:#testing #tdd #development #unit testing #red-green-refactor #test-driven #test-automation

Ready to run

npx skills add https://github.com/Danomanic/agent-skill-catalog --skill tdd-approach

💬 Prompt for ChatGPT / Claude Chat▼

Please help me install this Agent Skill.
Skill: tdd-approach
Source: https://github.com/Danomanic/agent-skill-catalog/tree/main/skills/tdd-approach
Command: npx skills add https://github.com/Danomanic/agent-skill-catalog --skill tdd-approach

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Prevents untested implementations and regressions by ensuring behavior is specified and verified through tests before code changes are made.

Core Features & Use Cases

Red-Green-Refactor workflow: Write a failing test, implement the minimum code to pass, then refactor while keeping tests green.
Framework-agnostic guidance: Adapt instructions to pytest, Jest, Go testing, or other existing test infrastructures.
Use Cases: Adding new features, fixing bugs, and improving legacy code confidence through incremental, test-backed changes.

Quick Start

When asked to implement a feature, write a failing test that describes the expected behavior and then implement the minimal code to make it pass.

Frequently Asked Questions about tdd-approach

High-intent search queries and answers about installing and using this skill.

FAQPage Schema

How do I use test-driven development to prevent code regressions?▼

Test-driven development prevents regressions by enforcing a red-green-refactor cycle: write a failing test specifying behavior, implement minimal code to pass, then refactor while tests stay green.

How do I start writing failing tests before implementing new features?▼

To write failing tests before implementation, create a runnable test case in your project's testing framework that describes the expected behavior, run it to confirm failure, then write the minimal code to make it pass.

Does test-driven development work with existing unit testing frameworks like Jest or pytest?▼

Test-driven development is framework-agnostic and adapts to existing test infrastructures including pytest, Jest, and Go testing, requiring only a runnable test suite to execute iterative red-green-refactor cycles.

What is the best way to fix bugs using red-green-refactor cycles?▼

The best way to fix bugs using red-green-refactor cycles is to first write a failing test reproducing the bug, then implement the minimal code fix to make the test pass, preventing future regressions.

Can I apply TDD workflows to improve untested legacy code?▼

TDD workflows improve untested legacy code by adding incremental, test-backed changes, building confidence through specifying and verifying behavior with runnable tests before modifying the implementation.

Why write a failing test before writing the implementation code?▼

Writing a failing test before implementation ensures behavior is explicitly specified and verified, preventing untested code paths and regressions by confirming the test fails for the right reason before code is written.