Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in I:\www\frameworks\Laravel\vendor\sebastian\diff\tests\Output\Integration\StrictUnifiedDiffOutputBuilderIntegrationTest.php:27 Stack trace: #0 {main} thrown in I:\www\frameworks\Laravel\vendor\sebastian\diff\tests\Output\Integration\StrictUnifiedDiffOutputBuilderIntegrationTest.php on line 27