Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in C:\mywamp\sites\allsite\calcomposer\vendor\sebastian\diff\tests\LCS\LongestCommonSubsequenceTest.php:15 Stack trace: #0 {main} thrown in C:\mywamp\sites\allsite\calcomposer\vendor\sebastian\diff\tests\LCS\LongestCommonSubsequenceTest.php on line 15