Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in /var/www/drupal/sites/energiatalgud/vendor/oomphinc/composer-installers-extender/tests/src/Installers/InstallerTest.php:12 Stack trace: #0 {main} thrown in /var/www/drupal/sites/energiatalgud/vendor/oomphinc/composer-installers-extender/tests/src/Installers/InstallerTest.php on line 12