CCA-F: Claude Certified Architect — Foundations

Providing a concrete test case — specific input containing null values along with the expected output — gives Claude a precise, verifiable target for debugging. This test-driven approach lets Claude reason about the exact failure condition and confirm the fix resolves it, rather than relying on vague instructions (like 'think harder'), verbal-only problem descriptions that risk incomplete regeneration, or bypassing Claude to manually patch the code, which forfeits the benefit of having the assistant understand and correct its own logic.