tdd

name

tdd

description

Test-Driven Development methodology and red-green-refactor workflow (formerly test-tdd). This skill should be used when practicing TDD, writing tests first, designing tests before implementation, or reviewing test-first approaches. Triggers on "write tests first", "test before code", "red green refactor", "test driven development". This skill does NOT cover Vitest framework specifics (use vitest skill) or API mocking with MSW (use msw skill).

Community Test-Driven Development Best Practices

Comprehensive guide to Test-Driven Development practices, designed for AI agents and LLMs. Contains 42 rules across 8 categories, prioritized by impact to guide test writing, refactoring, and code generation.

When to Apply

Reference these guidelines when:

• Writing new tests using TDD workflow
• Implementing the red-green-refactor cycle
• Designing test structure and organization
• Creating test data and fixtures
• Reviewing or refactoring existing test suites

TDD Workflow

1. RED: Write a failing test that defines desired behavior
2. GREEN: Write minimal code to make the test pass
3. REFACTOR: Clean up code while keeping tests green
4. Repeat for each new behavior

Rule Categories by Priority

Priority	Category	Impact	Prefix
1	Red-Green-Refactor Cycle	CRITICAL	cycle-
2	Test Design Principles	CRITICAL	design-
3	Test Isolation & Dependencies	HIGH