Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in E:\xampp\htdocs\webhost_v2\vendor\symfony\translation-contracts\Test\TranslatorTest.php:31 Stack trace: #0 {main} thrown in E:\xampp\htdocs\webhost_v2\vendor\symfony\translation-contracts\Test\TranslatorTest.php on line 31