public void OverDivdesLeftAndRightAfterBothUpdated()
{
var left = new Identity("left");
var right = new Identity("right");
var composite = left.Over(right);
left.Update(DateTime.Today, 1m);
right.Update(DateTime.Today, 1m);
Assert.AreEqual(1m, composite.Current.Value);
left.Update(DateTime.Today, 2m);
Assert.AreEqual(1m, composite.Current.Value);
left.Update(DateTime.Today, 3m);
Assert.AreEqual(1m, composite.Current.Value);
right.Update(DateTime.Today, 4m);
Assert.AreEqual(3m / 4m, composite.Current.Value);
}
public void OverHandlesDivideByZero()
{
var left = new Identity("left");
var right = new Identity("right");
var composite = left.Over(right);
var updatedEventFired = false;
composite.Updated += delegate { updatedEventFired = true; };
left.Update(DateTime.Today, 1m);
Assert.IsFalse(updatedEventFired);
right.Update(DateTime.Today, 0m);
Assert.IsFalse(updatedEventFired);
// submitting another update to right won't cause an update without corresponding update to left
right.Update(DateTime.Today, 1m);
Assert.IsFalse(updatedEventFired);
left.Update(DateTime.Today, 1m);
Assert.IsTrue(updatedEventFired);
}