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Test-Driven Development (TDD) Best Practices

Enforce Red-Green-Refactor workflows with test-first development for Go projects.

1|Updated Oct 20, 2025
Search Tags:#code quality#tdd#refactoring#unit testing#software design#test-driven development#red-green-refactor
One-click install
npx skills add https://github.com/colek42/claude-plugins --skill test-driven-development-tdd-best-practices
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: Test-Driven Development (TDD) Best Practices
Source: https://github.com/colek42/claude-plugins/tree/main/nk-dev-practices/skills/tdd-workflow
Command: npx skills add https://github.com/colek42/claude-plugins --skill test-driven-development-tdd-best-practices

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill requires github.com/stretchr/testify.

What problem does it solve?

This Skill guides developers through the rigorous Red-Green-Refactor cycle of Test-Driven Development, ensuring new features and bug fixes are implemented with high-quality, maintainable, and well-tested code. It reduces bugs and improves code design by forcing a test-first approach.

Core Features & Use Cases

  • Red-Green-Refactor Cycle: Enforces the core TDD workflow: write a failing test, write minimal code to make it pass, then clean up while keeping tests green.
  • Test Quality Standards: Emphasizes writing minimal, focused tests first, using appropriate naming conventions, and thoroughly testing error and edge cases.
  • Design for Testability: Promotes architectural patterns like dependency injection and interface-based abstractions to make code inherently easier to test.
  • Use Case: A developer is about to implement a new API endpoint. This skill reminds them to start by writing a failing test for the desired behavior, then write just enough code to pass it, and finally refactor, ensuring the new endpoint is well-tested and robust from inception.

Quick Start

Follow the TDD Workflow for every code change:

1. Red: Write a failing test that defines a new piece of functionality or a bug fix.

2. Green: Write the simplest possible code to make that new test pass.

3. Refactor: Clean up your code, improve its design, and remove duplication, ensuring all tests remain green.

Repeat this cycle continuously.

Frequently Asked Questions about Test-Driven Development (TDD) Best Practices

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

FAQPage Schema
How do I implement test-driven development in Go projects?▼

Test-driven development in Go follows the Red-Green-Refactor cycle: write a failing test first, write minimal code to pass it, then refactor while keeping tests green. Use testify for assertions and structure tests with table-driven patterns to cover normal and error cases systematically.

What's the best way to write unit tests that catch bugs early?▼

Write focused, minimal tests before implementing features using clear naming conventions and comprehensive error-case coverage. This test-first approach forces you to think through behavior upfront, reducing bugs and improving code design from inception.

How do I design code that's easier to test?▼

Use dependency injection and interface-based abstractions to isolate side effects and dependencies. Pure functions and loose coupling make code inherently testable and maintainable, aligning with test-driven development principles.

Can I use the Red-Green-Refactor cycle for bug fixes and refactoring?▼

Yes. The Red-Green-Refactor workflow applies to feature implementation, bug fixes, and refactoring. Write a test that demonstrates the bug or desired change, fix minimally to pass it, then refactor while ensuring all tests remain green.

Why does test-first development improve code quality?▼

Writing tests before code forces you to define behavior explicitly, encourages better design patterns like dependency injection, and ensures comprehensive coverage of normal and edge cases, resulting in robust, well-documented, and maintainable code.

Does testify support all the assertions I need for Go unit tests?▼

Testify is a recommended assertion library for Go that provides comprehensive assertion methods for unit, integration, and end-to-end tests, supporting the detailed test quality standards required by test-driven development workflows.

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