Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in C:\xampp\htdocs\mflux\vendor\nicmart\tree\test\Unit\Visitor\PreOrderVisitorTest.php:23
Stack trace:
#0 {main}
thrown in C:\xampp\htdocs\mflux\vendor\nicmart\tree\test\Unit\Visitor\PreOrderVisitorTest.php on line 23