Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in /var/www/html/conquer-online-worktrees/ai-agent-1/vendor/apimatic/core/tests/SignatureVerifierTest.php:12 Stack trace: #0 {main} thrown in /var/www/html/conquer-online-worktrees/ai-agent-1/vendor/apimatic/core/tests/SignatureVerifierTest.php on line 12