Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in E:\www\xmvc\v5.0\composer\vendor\workerman\coroutine\tests\WaitGroupTest.php:17 Stack trace: #0 {main} thrown in E:\www\xmvc\v5.0\composer\vendor\workerman\coroutine\tests\WaitGroupTest.php on line 17