public void Reverse_Arrows_in_the_GraphDsl_must_not_work_from_SourceShape()
{
RunnableGraph.FromGraph(
GraphDsl.Create(b =>
{
var o = b.Add(Source);
b.Invoking(builder => ((dynamic) builder).To(o).From(Source))
.ShouldThrow<RuntimeBinderException>();
b.To(Sink).From(o);
return ClosedShape.Instance;
}));
}