def test_stop():
alert.new(_alert_fn, delay=0.01)
a = alert.new(_alert_fn, delay=0.01)
assert len(alert.show()) == 2
a.stop()
assert len(alert.show()) == 1
alert.new(_alert_fn, delay=0.01)
alert.new(_alert_fn, delay=0.01)
assert len(alert.show()) == 3
alert.stop_all()
assert len(alert.show()) == 0
def setup():
yield
alert.stop_all()