Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in E:\xampp\htdocs\api.blank_fe\vendor\sebastian\diff\tests\LCS\LongestCommonSubsequenceTest.php:15 Stack trace: #0 {main} thrown in E:\xampp\htdocs\api.blank_fe\vendor\sebastian\diff\tests\LCS\LongestCommonSubsequenceTest.php on line 15