def METHOD_NAME(self):
    c = LanguageCodes
    assert "eng" == c.two_to_three['en']
    assert "en" == c.three_to_two['eng']
    assert ["English"] == c.english_names['en']
    assert ["English"] == c.english_names['eng']
    assert ["English"] == c.native_names['en']
    assert ["English"] == c.native_names['eng']
    assert "spa" == c.two_to_three['es']
    assert "es" == c.three_to_two['spa']
    assert ['Spanish', 'Castilian'] == c.english_names['es']
    assert ['Spanish', 'Castilian'] == c.english_names['spa']
    assert ["español", "castellano"] == c.native_names['es']
    assert ["español", "castellano"] == c.native_names['spa']
    assert "chi" == c.two_to_three['zh']
    assert "zh" == c.three_to_two['chi']
    assert ["Chinese"] == c.english_names['zh']
    assert ["Chinese"] == c.english_names['chi']
    # We don't have this translation yet.
    assert [] == c.native_names['zh']
    assert [] == c.native_names['chi']
    assert None == c.two_to_three['nosuchlanguage']
    assert None == c.three_to_two['nosuchlanguage']
    assert [] == c.english_names['nosuchlanguage']
    assert [] == c.native_names['nosuchlanguage']