Building reliable open-source software through Red → Green → Refactor cycles. Every test is a promise to make better code.
Click each phase to learn more
100% test coverage is our standard
Look for the ★ TDD BEST badge - these projects exemplify perfect Test-Driven Development workflows
Perfect TDD Implementation: Kotlin Multiplatform SDK for AI models with complete Red-Green-Refactor workflow. Every feature test-driven from conception.
SwiftUI-native framework that simplifies StoreKit integration for in-app purchases with comprehensive test coverage.
Pure TDD Implementation: Maven publishing tool built entirely through Test-Driven Development. Every CLI command, API integration, and deployment feature test-first.
Kotlin Multiplatform SDK for Lemon Squeezy payment platform with comprehensive test coverage for reliable transactions.
Collection of Spring Boot examples in Kotlin demonstrating TDD practices in enterprise applications and microservices.
Tuist template for SwiftUI projects with pre-configured TDD setup, testing frameworks, and CI/CD pipelines.
Example macOS application demonstrating OpenAI Kotlin KMP library integration with TDD practices and native UI.
Experience the Red-Green-Refactor cycle
describe('Calculator', () => { it('should add two numbers', () => { const result = add(2, 3); expect(result).toBe(5); }); });
// Write your implementation here function add(a, b) { // TODO: implement }
Every test you write makes software more reliable. Every contribution matters.
Start with behavior, not implementation
Simple solutions that work
Tests protect you from regression