Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in /home/stagingaicapital/public_html/app/Vendor/phpoffice/math/tests/Math/Reader/MathMLTest.php:14 Stack trace: #0 {main} thrown in /home/stagingaicapital/public_html/app/Vendor/phpoffice/math/tests/Math/Reader/MathMLTest.php on line 14