Guide test-first development with behavior-focused public-interface tests.
npx skills add https://github.com/haryelramalho/skills --skill tdd-haryelramalho
Please help me install this Agent Skill. Skill: tdd Source: https://github.com/haryelramalho/skills/tree/main/skills/community/tdd Command: npx skills add https://github.com/haryelramalho/skills --skill tdd-haryelramalho
This Skill helps you build features and fix bugs test first, so you can verify behavior early and avoid brittle tests tied to implementation details.
Use this skill to choose one behavior to test first, write the smallest failing test, and iterate red-green-refactor until the feature is complete.
High-intent search queries and answers about installing and using this skill.
Behavior-focused tests validate public interface outputs rather than internal implementation details, ensuring they survive refactoring. By asserting observable system behavior through public APIs, tests remain valid even when internal code structures change during refactoring.
The red-green-refactor workflow involves writing a failing test first, implementing the smallest code to make it pass, then safely improving the design. This iterative process moves one behavior at a time from failing test to minimal passing implementation to clean refactored code.
Mocking should be applied only at system boundaries such as external APIs, databases, time, randomness, or the file system. Boundary mocking isolates external dependencies during integration testing while keeping the core business logic tested against real interactions.
Bug fixing with test-first development starts by writing a failing test that reproduces the specific bug behavior. You then implement the smallest code change to make the test pass, verifying the fix works early while ensuring the behavior remains correct through observable assertions.
Test-first development requires no specific testing frameworks or external dependencies. It applies behavior-focused, public-interface testing principles across any software project, needing only minimal implementations and observable assertions to guide the red-green-refactor workflow.
Adding a feature with test-driven development starts by choosing one behavior to test first, writing the smallest failing test, and iterating red-green-refactor until complete. This tracer-bullet approach verifies behavior early and builds confidence through minimal, observable passing implementations.
davpatel605-beepEnforce a RED-GREEN-REFACTOR workflow with failing tests before production code.
franroaEnforce test-first development with failing tests before production code.
vladkeslerIsolate external dependencies in Python and JavaScript tests with mocking patterns.
johannesfritzRun integration tests across services to validate end-to-end behavior.
