Fatal error: Uncaught Error: Class "WP_UnitTestCase" not found in /home/xs854402/smcse.co.jp/public_html/wp-content/plugins/ewww-image-optimizer/tests/test-convert.php:12 Stack trace: #0 {main} thrown in /home/xs854402/smcse.co.jp/public_html/wp-content/plugins/ewww-image-optimizer/tests/test-convert.php on line 12