Class 'PHPUnit\Framework\TestCase' not found in C:\xampp\htdocs\IEXBase\tronAPI\tests\TronTest.php:8

[Triuneagle]

I keep getting this error report from my browser Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in C:\xampp\htdocs\IEXBase\tronAPI\tests\TronTest.php:8 Stack trace: #0 {main} thrown in C:\xampp\htdocs\IEXBase\tronAPI\tests\TronTest.php on line 8. Please did I do anything wrong or did I wrongly install the API. Please I need help.

[neverlose-lv]

Have you run composer install?