def test_average_int32_empty(self):
scheduler = TestScheduler()
msgs = [on_next(150, 1), on_completed(250)]
xs = scheduler.create_hot_observable(msgs)
res = scheduler.start(create=lambda: xs.pipe(_.average())).messages
assert len(res) == 1
assert res[0].value.kind == "E" and res[0].value.exception != None
assert res[0].time == 250
def create():
return xs.pipe(_.average(len))