Moq with Task await

Question

Since I have converted my WCF methods to Async, my unit tests have failed, and I can\'t figure out the correct syntax to get them to work.

Cllient proxy class

Answer 1

DoSomething returns null instead of returning a Task, and so you get an exception when awaiting it. You need to specify when building the mock that it should return a Task.

In this case it seems that you can simply return an already completed task using Task.FromResult so the mock setup should look like this:

this._mockService.Setup(...).Returns(Task.FromResult(false));

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Beginning with the next version of .Net (4.6) you can use Task.CompletedTask like this:

this._mockService.Setup(...).Returns(Task.CompletedTask);