Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in C:\mywamp\sites\allsite\calcomposer\vendor\symfony\console\Tests\Style\SymfonyStyleTest.php:23 Stack trace: #0 {main} thrown in C:\mywamp\sites\allsite\calcomposer\vendor\symfony\console\Tests\Style\SymfonyStyleTest.php on line 23