解决方法
它们应该可用.但是,PHPUnit在测试之间备份全局状态：
By default,PHPUnit runs your tests in a way where changes to global and super-global variables ($GLOBALS,$_ENV,$_POST,$_GET,$_COOKIE,$_SERVER,$_FILES,$_REQUEST) do not affect other tests. Optionally,this isolation can be extended to static attributes of classes.
所以这可能是一个问题.另请注意
Objects of some classes that are provided by PHP itself,such as PDO for example,cannot be serialized and the backup operation will break when such an object is stored in the $GLOBALS array,for instance.
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