test(handlers): Add tests for error handlers (API, CLI, HTTP)

[usernane]

File

Handlers/APICallErrHandler.php, Handlers/CLIErrHandler.php, Handlers/HTTPErrHandler.php

Current Coverage

0% (0/85 combined)

Scenarios to Cover

• APICallErrHandler: outputs correct JSON error response on exception
• APICallErrHandler: handles different HTTP error codes
• CLIErrHandler: outputs formatted error to CLI on exception
• CLIErrHandler: handles fatal errors
• HTTPErrHandler: renders correct HTTP error page
• HTTPErrHandler: handles 404, 500 codes

Notes

All three handlers are at 0%. These are the last line of defense — untested means unknown behavior when things go wrong in production.