How to use the betelgeuse.validate_key_value_option function in Betelgeuse

def test_validate_key_value_option_exception():
    """Check if validate_key_value_option validates invalid values."""
    option = mock.MagicMock()
    option.name = 'option_name'
    msg = 'option_name needs to be in format key=value'
    for value in ('value', ''):
        with pytest.raises(click.BadParameter) as excinfo:
            validate_key_value_option(None, option, value)
        assert excinfo.value.message == msg

def test_validate_key_value_option():
    """Check if validate_key_value_option works."""
    # None value will be passed when the option is not specified.
    for value, result in (('key=value=', ('key', 'value=')), (None, None)):
        assert validate_key_value_option(
            None, mock.MagicMock(), value) == result