public void TestCanActivityEverBeIncluded()
        {
            var graph = new DcrGraph();
            graph.AddActivity("A", "somename1");
            graph.AddActivity("B", "somename2");
            graph.AddActivity("C", "somename3");
            graph.AddActivity("D", "somename3");

            graph.SetIncluded(true, "A"); // Start at A

            graph.AddIncludeExclude(true, "A", "B");
            graph.AddIncludeExclude(true, "B", "C");
            graph.AddIncludeExclude(false, "C", "B");
            graph.AddResponse("B", "C");
            // Self-excludes
            graph.AddIncludeExclude(false, "A", "A");
            graph.AddIncludeExclude(false, "B", "B");
            graph.AddIncludeExclude(false, "C", "C");

            Console.WriteLine(graph);

            foreach (var activity in graph.Activities)
            {
                Console.WriteLine(activity.Id + " includable: " + graph.CanActivityEverBeIncluded(activity.Id));
            }

            Console.ReadLine();
        }