public void A_Sum_must_work_when_using_Source_RunSum()
{
this.AssertAllStagesStopped(() =>
{
var t = InputSource.RunSum((i, i1) => i + i1, Materializer);
t.Wait(TimeSpan.FromSeconds(3)).Should().BeTrue();
t.Result.Should().Be(Expected);
}, Materializer);
}