Testing Best Practices

Core Philosophy

Write invariant-based tests that verify what SHOULD be true, not bug-affirming tests that prove bugs existed.

Test-Driven Development (TDD)

ALWAYS use TDD when fixing bugs:

1. Find existing tests for the broken functionality
2. Run them to verify they pass (shouldn't catch bug)
3. Improve tests until they fail (exposing the bug)
4. Fix the code to make tests pass
5. Verify all tests pass

Quick Start