Fatal error: Uncaught Error: Class 'WP_UnitTestCase' not found in /home/cleytonsena/www/wp-content/plugins/ewww-image-optimizer/tests/test-plugin-headers.php:12
Stack trace:
#0 {main}
thrown in /home/cleytonsena/www/wp-content/plugins/ewww-image-optimizer/tests/test-plugin-headers.php on line 12