public void SimpleErrors()
{
var valueStack = new Stack <Exception>();
var errorStack = new Stack <Exception>();
bool isComplete = false;
var obs1 = new PushSubject <int>();
var output = obs1.ExceptionsToObservable();
output.Subscribe(valueStack.Push, () => isComplete = true, errorStack.Push);
var ex = new Exception();
obs1.PushException(ex);
Assert.IsTrue(Object.ReferenceEquals(ex, valueStack.Peek()), "exception message should be in the output stream");
Assert.AreEqual(0, errorStack.Count, "no exception should be in the error output stream");
ex = new Exception();
obs1.PushException(ex);
Assert.IsTrue(Object.ReferenceEquals(ex, valueStack.Peek()), "exception message should be in the output stream");
Assert.AreEqual(0, errorStack.Count, "no exception should be in the error output stream");
obs1.Complete();
Assert.AreEqual(2, valueStack.Count, "no more exception should be in the error output stream");
Assert.IsTrue(isComplete, "the output stream should be complete");
}