Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in E:\phpProject\TEST\vat_api_it_client\vendor\phpoffice\math\tests\Math\Element\IdentifierTest.php:10 Stack trace: #0 {main} thrown in E:\phpProject\TEST\vat_api_it_client\vendor\phpoffice\math\tests\Math\Element\IdentifierTest.php on line 10