code: def test_struct_to_pandas() -> None:
      pdf = pd.DataFrame([{"a": {"b": {"c": 2}}}])
      df = pl.from_pandas(pdf)
  
      assert isinstance(df.dtypes[0], pl.datatypes.Struct)
      assert df.to_pandas().equals(pdf)
  
imports: from __future__ import annotations
  from dataclasses import dataclass
  from datetime import datetime, time
  from typing import TYPE_CHECKING
  import pandas
  import pyarrow
  import pytest
  import polars
  import polars.selectors
  from polars.testing import assert_frame_equal, assert_series_equal
label_desc: Use image node_id 10 for calling a global function with example usage: test_struct_to_pandas() without return types