Using Moq to mock an asynchronous method for a unit test

Question

I am testing a method for a service that makes a Web API call. Using a normal HttpClient works fine for unit tests if I also run the web service (l

Answer 1

You're creating a task but never starting it, so it's never completing. However, don't just start the task - instead, change to using Task.FromResult which will give you a task which has already completed:

...
.Returns(Task.FromResult(new HttpResponseMessage(System.Net.HttpStatusCode.OK)));

Note that you won't be testing the actual asynchrony this way - if you want to do that, you need to do a bit more work to create a Task that you can control in a more fine-grained manner... but that's something for another day.

You might also want to consider using a fake for IHttpClient rather than mocking everything - it really depends on how often you need it.