Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in C:\mywamp\sites\allsite\calcomposer\vendor\symfony\translation\Tests\Formatter\IntlFormatterTest.php:21 Stack trace: #0 {main} thrown in C:\mywamp\sites\allsite\calcomposer\vendor\symfony\translation\Tests\Formatter\IntlFormatterTest.php on line 21