Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in C:\Apache24\htdocs\vendor.old\sebastian\diff\tests\LCS\LongestCommonSubsequenceTest.php:15 Stack trace: #0 {main} thrown in C:\Apache24\htdocs\vendor.old\sebastian\diff\tests\LCS\LongestCommonSubsequenceTest.php on line 15