test-driven-development
Test-Driven Development
Overview
Write a failing test first, then implement the minimum code to pass, then refactor. Tests are proof that the system behaves as intended. This is the canonical Build-phase testing skill.
When to Use
- Implementing new logic or features
- Fixing bugs (write a failing test that reproduces the bug)
- Refactoring existing behavior
- Changing any code that has correctness requirements
Test Pyramid
- 80% Unit tests: fast, isolated, test individual functions and components
- 15% Integration tests: test interactions between modules
- 5% End-to-end tests: test critical user flows through the full stack
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