Fatal error: Uncaught Error: Class 'PHPUnit_Framework_TestCase' not found in /var/www/html/a2billing/vendor/phpunit/php-code-coverage/tests/PHP/CodeCoverage/UtilTest.php:16 Stack trace: #0 {main} thrown in /var/www/html/a2billing/vendor/phpunit/php-code-coverage/tests/PHP/CodeCoverage/UtilTest.php on line 16