Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in D:\workspaces\liZiPingBack\vendor\symfony\form\Test\FormIntegrationTestCase.php:21 Stack trace: #0 {main} thrown in D:\workspaces\liZiPingBack\vendor\symfony\form\Test\FormIntegrationTestCase.php on line 21