def METHOD_NAME(self):
    """Test if data type is not supported"""
    syn = Mock()
    with patch.object(
        describe_functions, "_open_entity_as_df", return_value=None
    ), patch.object(describe_functions, "_describe_wrapper") as mock_describe:
        result = describe_functions.describe(syn=syn, entity="syn1234")
        mock_describe.assert_not_called()
        assert result is None