test-driven-development

Write one failing test before implementation and outline RED-GREEN-REFACTOR steps.

2|Updated Mar 4, 2026

Search Tags:#testing #tdd #red-green-refactor #unit-tests #test-quality #regression-tests

Ready to run

npx skills add https://github.com/thesyntaxninja/syntaxninja-dojo --skill test-driven-development-thesyntaxninja

💬 Prompt for ChatGPT / Claude Chat▼

Please help me install this Agent Skill.
Skill: test-driven-development
Source: https://github.com/thesyntaxninja/syntaxninja-dojo/tree/main/skills/test-driven-development
Command: npx skills add https://github.com/thesyntaxninja/syntaxninja-dojo --skill test-driven-development-thesyntaxninja

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Prevents unclear requirements and regressions by making tests the specification for features and bug fixes so behavior is verified before implementation.

Core Features & Use Cases

Test-first specification: write one focused failing test that defines the desired behavior.
Red/Green/Refactor workflow: run the test to see it fail, implement the minimal code to make it pass, then refactor safely.
Use cases: implementing new features, adding behavior to existing code, and creating regression tests for bug fixes.

Quick Start

Create a single failing test that describes the desired behavior, run it to see it fail, implement the minimal code to make it pass, then refactor.

Frequently Asked Questions about test-driven-development

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

FAQPage Schema

How do I write unit tests before implementation using test-driven development?▼

Test-driven development guides you to write one focused failing unit test that defines desired behavior, run it to see it fail, implement minimal code to pass, then refactor safely.

What is the red-green-refactor workflow in TDD?▼

The red-green-refactor workflow is a TDD cycle where you write a failing test, implement the minimal code to make it pass, and then refactor the code while keeping tests green.

When should I use test-driven development for bug fixes?▼

Use test-driven development for bug fixes by creating regression tests that define the expected behavior first, ensuring the fix is verified before implementation and preventing future regressions.

How do I write descriptive test names for unit tests?▼

Descriptive test names are generated to clearly specify the expected behavior being tested, ensuring the test acts as a readable specification for the feature or regression being implemented.

Can I use TDD to add behavior to existing code?▼

Yes, you can apply test-driven development when adding behavior to existing code by writing a minimal failing test that specifies the new behavior before implementing the required changes.