The implementation boundary
Capture observable behavior before changing internals. Start with one happy path and one denied or invalid case for each important operation. Test login, ownership, duplicate submissions and empty results. Use isolated fixtures rather than a copy of customer data.
Verification that matters
Run the same tests before and after each small change. Add static analysis as a complementary check, not a substitute for runtime behavior. Distinguish syntax checks, unit tests, HTTP integration tests and real-browser tests in your release notes. State untested environments explicitly.
Official documentation and further reading
This is an overview based on official product information, not a hands-on performance test or security certification.
