Stubbing Task returning method in async unit test

Question

Let\'s say I have the following class and an interface it depends on:

public class MyController
{
    private IRepository _repository;
    public MyControlle         


        

Answer 1

You will need to return something; async Task methods cannot ever return null.

The T doesn't matter. You could declare a static readonly Task SuccessTask = Task.FromResult<object>(null); as a helper constant if you want. I have similar constants in my AsyncEx library.

Answer 2

If you are targeting .NET Framework 4.6 or later, you can now use .Returns(Task.CompletedTask) instead which is slightly shorter.