如果这个用户角色不是我们预期的，就会把用户重定向到一个错误页面。
If the user role is not what was expected, then we redirect the user to an error page.
如果测试方法没有按预期运行，我们将得到一个错误(以及描述这个错误的回溯)。
If the test method does not run as anticipated, we will get an error (and a traceback describing the error).
我们建议您在项目中添加安全性代码和错误处理代码，以使项目达到您预期的安全性和可靠性标准。
We recommend that you add security and error-handling code to your projects to make them as secure and robust as you deem appropriate.
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