Language-Agnostic Testing Principles

Core Testing Philosophy

1. Tests are First-Class Code: Maintain test quality equal to production code
2. Fast Feedback: Tests should run quickly and provide immediate feedback
3. Reliability: Tests should be deterministic and reproducible
4. Independence: Each test should run in isolation

Test-Driven Development (TDD)

The RED-GREEN-REFACTOR Cycle

Always follow this cycle:

1. RED: Write a failing test first
   • Write the test before implementation
   • Ensure the test fails for the right reason
   • Verify test can actually fail