Fatal error: Uncaught Error: Class "Tests\PhpOffice\Math\Writer\WriterTestCase" not found in /var/www/binary/vendor/phpoffice/math/tests/Math/Writer/MathMLTest.php:12 Stack trace: #0 {main} thrown in /var/www/binary/vendor/phpoffice/math/tests/Math/Writer/MathMLTest.php on line 12