You can also test whether a user-space pointer is valid through a call to access_ok.

您也可以通过调用access_ok来测试用户空间指针是否有效。

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With the asyncEcho test, it wraps the asserts in a try/catch, and any errors are passed back to the DOH through the deferred.errback(error) call.

对于 asyncEcho 测试，它将断言包装进一个 try/catch 程序块，并且，任何错误都将通过 deferred.errback(error) 调用被传递回 DOH。

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Now, we can call the reset method to start off each test run to ensure we are going through the initialization code for the singleton object on every test run.

现在，我们可以在每次测试之前调用reset方法，保证我们在每次测试过程中都会先执行singleton对象的初始化代码。

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