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