public void TestAcyclicTopDownOrder()
{
IDictionary<string, ICollection<string>> graph = new LinkedHashMap<string, ICollection<string>>();
Add(graph, "1_1", "R2");
Add(graph, "A", "R1");
Add(graph, "A", "R2");
EPAssertionUtil.AssertEqualsExactOrder(new [] { "R1","R2","1_1","A" }, GraphUtil.GetTopDownOrder(graph).ToArray());
Add(graph, "R1", "R2");
EPAssertionUtil.AssertEqualsExactOrder(new [] { "R2","1_1","R1","A" }, GraphUtil.GetTopDownOrder(graph).ToArray());
Add(graph, "1_1", "A");
EPAssertionUtil.AssertEqualsExactOrder(new [] { "R2","R1","A","1_1" }, GraphUtil.GetTopDownOrder(graph).ToArray());
Add(graph, "0", "1_1");
EPAssertionUtil.AssertEqualsExactOrder(new [] { "R2","R1","A","1_1","0" }, GraphUtil.GetTopDownOrder(graph).ToArray());
Add(graph, "R1", "0");
TryInvalid(graph, "Circular dependency detected between [\"0\", \"R1\", \"A\", \"1_1\"]");
}