Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in /home/edmedu/www/edmeducation.co.kr/tw-dev/vendor/sebastian/diff/tests/LongestCommonSubsequenceTest.php:18 Stack trace: #0 {main} thrown in /home/edmedu/www/edmeducation.co.kr/tw-dev/vendor/sebastian/diff/tests/LongestCommonSubsequenceTest.php on line 18