Fatal error: Uncaught Error: Class "Stevebauman\Purify\Tests\TestCase" not found in C:\xampp\htdocs\vendor\stevebauman\purify\tests\NullDefinitionCacheTest.php:9 Stack trace: #0 {main} thrown in C:\xampp\htdocs\vendor\stevebauman\purify\tests\NullDefinitionCacheTest.php on line 9