Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in E:\www\mdm\mvc\v2\composer\vendor\workerman\coroutine\tests\FiberChannelTest.php:8 Stack trace: #0 {main} thrown in E:\www\mdm\mvc\v2\composer\vendor\workerman\coroutine\tests\FiberChannelTest.php on line 8