Code coverage for async methods

Question

When I analyse code coverage in Visual Studio 2012, any of the await lines in async methods are showing as not covered even though they are obviously executing since my test

Answer 1

There are situations where I don't care about testing the async nature of a method but just want to get rid of the partial code coverage. I use below extension method to avoid this and it works just fine for me.

Warning "Thread.Sleep" used here!

public static IReturnsResult ReturnsAsyncDelayed(this ISetup> setup, TResponse value) where TClass : class
{
    var completionSource = new TaskCompletionSource();
    Task.Run(() => { Thread.Sleep(200); completionSource.SetResult(value); });
    return setup.Returns(completionSource.Task);
}

and the usage is similar to the Moq's ReturnsAsync Setup.

_sampleMock.Setup(s => s.SampleMethodAsync()).ReturnsAsyncDelayed(response);