Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in E:\phpProject\TEST\vat_api_se_client\vendor\phpoffice\math\tests\Math\Reader\OfficeMathMLTest.php:14 Stack trace: #0 {main} thrown in E:\phpProject\TEST\vat_api_se_client\vendor\phpoffice\math\tests\Math\Reader\OfficeMathMLTest.php on line 14