Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in D:\Apache24\www\baojie\back\vendor\symfony\translation-contracts\Test\TranslatorTest.php:31 Stack trace: #0 {main} thrown in D:\Apache24\www\baojie\back\vendor\symfony\translation-contracts\Test\TranslatorTest.php on line 31