Warning: require_once(PHPUnit/Framework.php): Failed to open stream: No such file or directory in /usr/local/www/wordpress/wp-content/plugins/extension-manager/tests/DateHelperTest.php on line 22

Fatal error: Uncaught Error: Failed opening required 'PHPUnit/Framework.php' (include_path='.:/usr/local/share/pear') in /usr/local/www/wordpress/wp-content/plugins/extension-manager/tests/DateHelperTest.php:22 Stack trace: #0 {main} thrown in /usr/local/www/wordpress/wp-content/plugins/extension-manager/tests/DateHelperTest.php on line 22