docstr: Test that `convert_df_to_data_format` raises a ValueError when
  passed an unknown data format.
docstr_tok: ["Test","that","`","convert_df_to_data_format","`","raises","a","ValueError","when","passed","an","unknown","data","format","."]
code: def test_convert_df_to_data_format_with_unknown_data_format(self):
      """Test that `convert_df_to_data_format` raises a ValueError when
      passed an unknown data format.
      """
      with self.assertRaises(ValueError):
          type_util.convert_df_to_data_format(
              pd.DataFrame({"a": [1, 2, 3]}),
              type_util.DataFormat.UNKNOWN,
          )
  
imports: import enum
  import unittest
  from collections import namedtuple
  from datetime import date
  from decimal import Decimal
  from typing import Any
  from unittest.mock import patch
  import numpy
  import pandas
  import plotly.graph_objs
  import pytest
  from pandas.api.types import infer_dtype
  from parameterized import parameterized
  from streamlit import errors, type_util
  from streamlit.errors import StreamlitAPIException
  from tests.streamlit.data_mocks import BASE_TYPES_DF, DATETIME_TYPES_DF, INTERVAL_TYPES_DF, LIST_TYPES_DF, NUMBER_TYPES_DF, PERIOD_TYPES_DF, SHARED_TEST_CASES, SPECIAL_TYPES_DF, UNSUPPORTED_TYPES_DF, TestCaseMetadata, TestObject
  from tests.streamlit.snowpark_mocks import DataFrame
  from tests.streamlit.snowpark_mocks import Row
  from tests.testutil import create_snowpark_session, patch_config_options
label_desc: Use image node_id 29 for calling the TypeUtilTest obj's underlying member method code with example usage: obj.test_convert_df_to_data_format_with_unknown_data_format() without return types