public void SimpleMerge()
{
var valueStack = new Stack <int>();
var errorStack = new Stack <Exception>();
bool isComplete = false;
var obs1 = new PushSubject <int>();
var obs2 = new PushSubject <int>();
var output = obs1.Merge(obs2);
output.Subscribe(valueStack.Push, () => isComplete = true, errorStack.Push);
obs1.PushValue(1);
Assert.AreEqual(1, valueStack.Peek(), "input from one stream should be found on the merged stream");
obs2.PushValue(2);
Assert.AreEqual(2, valueStack.Peek(), "input from one stream should be found on the merged stream");
obs2.PushValue(3);
Assert.AreEqual(3, valueStack.Peek(), "input from one stream should be found on the merged stream");
obs1.PushValue(4);
Assert.AreEqual(4, valueStack.Peek(), "input from one stream should be found on the merged stream");
var ex1 = new Exception();
obs1.PushException(ex1);
Assert.IsTrue(Object.ReferenceEquals(ex1, errorStack.Peek()), "input exception from one stream should be found on the merged stream");
var ex2 = new Exception();
obs2.PushException(ex2);
Assert.IsTrue(Object.ReferenceEquals(ex2, errorStack.Peek()), "input exception from one stream should be found on the merged stream");
Assert.IsFalse(isComplete, "the stream should not be finished if not every input stream is complete");
obs1.Complete();
Assert.IsFalse(isComplete, "the stream should not be finished if not every input stream is complete");
obs2.Complete();
Assert.IsTrue(isComplete, "the stream should be finished if every input stream is complete");
}