def test_cmf_is_valid():
''' Tests if a cmf returns as valid data.
'''
obs = colorimetry.prepare_cmf()
assert 'X' in obs
assert 'Y' in obs
assert 'Z' in obs
assert 'wvl' in obs
assert len(obs['X']) == len(obs['Y']) == len(obs['Z']) == len(obs['wvl'])
def test_prepare_cmf_throws_for_bad_choices():
with pytest.raises(ValueError):
colorimetry.prepare_cmf('asdf')
def test_can_prepare_cmf_1964_10deg():
''' Trusts observer is properly formed.
'''
obs = colorimetry.prepare_cmf('1964_10deg')
assert obs