public void ComplexDistinct()
{
var valueStack = new Stack <Tuple <int> >();
var errorStack = new Stack <Exception>();
bool isComplete = false;
var obs = new PushSubject <Tuple <int> >();
var output = obs.DistinctUntilChanged((l, r) => l.Item1 == r.Item1);
output.Subscribe(valueStack.Push, () => isComplete = true, errorStack.Push);
obs.PushValue(new Tuple <int>(1));
Assert.AreEqual(1, valueStack.Peek().Item1, "the input value should be issued");
obs.PushValue(new Tuple <int>(2));
Assert.AreEqual(2, valueStack.Peek().Item1, "the input value should be issued");
obs.PushValue(new Tuple <int>(1));
Assert.AreEqual(3, valueStack.Count, "the input value can be issued as long as the previous value is different");
Assert.AreEqual(1, valueStack.Peek().Item1, "the input value should be issued");
obs.PushValue(new Tuple <int>(1));
Assert.AreEqual(3, valueStack.Count, "the input value should not be issued issued again as it is the same");
obs.PushValue(new Tuple <int>(2));
Assert.AreEqual(4, valueStack.Count, "the input value can to be issued again as it is not the same than the previous one");
Assert.AreEqual(2, valueStack.Peek().Item1, "the input value should be issued");
obs.Complete();
Assert.IsTrue(isComplete, "the stream should be completed");
}
