Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in C:\xampp\htdocs\amik7d\vendor\sebastian\diff\tests\Output\Integration\StrictUnifiedDiffOutputBuilderIntegrationTest.php:27 Stack trace: #0 {main} thrown in C:\xampp\htdocs\amik7d\vendor\sebastian\diff\tests\Output\Integration\StrictUnifiedDiffOutputBuilderIntegrationTest.php on line 27