Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in C:\xampp\htdocs\mflux\vendor\league\oauth1-client\tests\ClientCredentialsTest.php:9
Stack trace:
#0 {main}
thrown in C:\xampp\htdocs\mflux\vendor\league\oauth1-client\tests\ClientCredentialsTest.php on line 9