def test_lookup(self):
        assert event.Priority.lookup(event.Priority.CORE) is event.Priority.CORE
        assert event.Priority.lookup(event.Priority.CORE.value) is event.Priority.CORE
        assert event.Priority.lookup(-12312412) == -12312412
def test_disk_usage_sensor_is_stateless():
    sensor = disk_usage.DiskUsage()
    ok_([] != sensor.measure())