Fatal error: Uncaught Error: Class 'Contao\ComponentsInstaller\Test\TestCase' not found in /home/eberhardschwarze/public_html/vendor/contao-components/installer/tests/Composer/LibraryInstallerTest.php:18 Stack trace: #0 {main} thrown in /home/eberhardschwarze/public_html/vendor/contao-components/installer/tests/Composer/LibraryInstallerTest.php on line 18