When a doh.Deferred object is returned from a unit test, you must catch all errors from the asynch call and pass them to the object's errback method.
当从单元测试中返回一个doh.Deferred对象时，必须捕获异步调用中产生的所有错误信息并把它们传递给对象的errback方法。
When a doh.Deferred object is returned from a unit test, you must catch all errors from the asynch call and pass them to the object's errback method.
当从单元测试中返回一个doh.Deferred对象时，必须捕获异步调用中产生的所有错误信息并把它们传递给对象的errback方法。
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