Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in C:\Apache24_x64\htdocs\ex-vak\vendor\sebastian\diff\tests\LineTest.php:18 Stack trace: #0 {main} thrown in C:\Apache24_x64\htdocs\ex-vak\vendor\sebastian\diff\tests\LineTest.php on line 18