Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in E:\phpProject\TEST\vat_api_se_client\vendor\phpoffice\math\tests\Math\Writer\WriterTestCase.php:11 Stack trace: #0 {main} thrown in E:\phpProject\TEST\vat_api_se_client\vendor\phpoffice\math\tests\Math\Writer\WriterTestCase.php on line 11