Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in /var/www/usonboard.com/vendor/microsoft/microsoft-graph-core/tests/Authentication/GraphPhpLeagueAccessTokenProviderTest.php:16 Stack trace: #0 {main} thrown in /var/www/usonboard.com/vendor/microsoft/microsoft-graph-core/tests/Authentication/GraphPhpLeagueAccessTokenProviderTest.php on line 16