def test_auto_codes():
"""Make sure colors change when toggled."""
codes = colorclass._AutoCodes()
key = '{autoblack}{autored}{autogreen}{autoyellow}{autoblue}{automagenta}{autocyan}{autowhite}'
colorclass.set_light_background()
assert '3031323334353637' == key.format(**codes)
colorclass.set_dark_background()
assert '9091929394959697' == key.format(**codes)
assert len(colorclass._BASE_CODES) == len(codes)
