Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in D:\Apache24\www\baojie\back\vendor\mtownsend\xml-to-array\tests\XmlToArrayTest.php:5 Stack trace: #0 {main} thrown in D:\Apache24\www\baojie\back\vendor\mtownsend\xml-to-array\tests\XmlToArrayTest.php on line 5