Fatal error: Uncaught ReflectionException: Class PHPUnit\Framework\TestCase does not exist in D:\workspaces\liZiPingBack\vendor\symfony\validator\Test\ForwardCompatTestTrait.php:18 Stack trace: #0 D:\workspaces\liZiPingBack\vendor\symfony\validator\Test\ForwardCompatTestTrait.php(18): ReflectionMethod->__construct('PHPUnit\\Framewo...', 'tearDown') #1 {main} thrown in D:\workspaces\liZiPingBack\vendor\symfony\validator\Test\ForwardCompatTestTrait.php on line 18