Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in /var/www/drupal/sites/energiatalgud/vendor/oomphinc/composer-installers-extender/tests/src/Installers/CustomInstallerTest.php:10 Stack trace: #0 {main} thrown in /var/www/drupal/sites/energiatalgud/vendor/oomphinc/composer-installers-extender/tests/src/Installers/CustomInstallerTest.php on line 10