Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in C:\xampp\htdocs\fiveplus\vendor\phpunit\phpunit-mock-objects\tests\MockBuilderTest.php:14 Stack trace: #0 {main} thrown in C:\xampp\htdocs\fiveplus\vendor\phpunit\phpunit-mock-objects\tests\MockBuilderTest.php on line 14