gistfile1.cs

public static void ReturnsValueAsTask<T>(this Task<T> value, T returnThis, params T[] returnThese)
{
    Returns(MatchArgs.AsSpecifiedInCall, ToCompletedTask(returnThis), returnThese.Select(ToCompletedTask).ToArray());
}

public static void ReturnsValueAsTask<T>(this Task<T> value, Func<CallInfo, T> returnThis)
{
    Returns(MatchArgs.AsSpecifiedInCall, c => ToCompletedTask(returnThis(c)));
}

private static Task<T> ToCompletedTask<T>(T value)
{
    var taskCompletionSource = new TaskCompletionSource<T>();
    taskCompletionSource.SetResult(value);

    return taskCompletionSource.Task;
}

Hi Jake.
Do you have examples how these extensions can be called?