public void ClearState()
{
RiverModelLC riverModelLC = new RiverModelLC();
Trigger trigger = new Trigger();
riverModelLC.Initialize(new Argument[0]);
Link triggerLink = new Link();
triggerLink.ID = "TargetToTriggerLink";
triggerLink.SourceComponent = riverModelLC;
triggerLink.SourceElementSet = riverModelLC.GetOutputExchangeItem(0).ElementSet; //last branch in the river
triggerLink.SourceQuantity = riverModelLC.GetOutputExchangeItem(0).Quantity;
triggerLink.TargetComponent = trigger;
triggerLink.TargetElementSet = trigger.GetInputExchangeItem(0).ElementSet;
triggerLink.TargetQuantity = trigger.GetInputExchangeItem(0).Quantity;
riverModelLC.AddLink(triggerLink);
riverModelLC.Prepare();
string stateID = riverModelLC.KeepCurrentState();
Assert.AreEqual("state:1",stateID);
Assert.AreEqual(1,riverModelLC._riverModelEngine._states.Count);
riverModelLC.ClearState("state:1");
Assert.AreEqual(0,riverModelLC._riverModelEngine._states.Count);
}