public void Fail_should_set_exception_of_TaskCompletionSource()
{
var taskCompletionSource = new TaskCompletionSource <int>();
var sut = new QueueMessage <int>(null, 0, taskCompletionSource);
sut.Fail(new Exception("something went wrong"));
taskCompletionSource.Awaiting(t => t.Task)
.Should().Throw <Exception>()
.WithMessage("something went wrong");
}