code: def test_num_chunks() -> None:
      s = pl.Series([1, 2])
      col = PolarsColumn(s)
      assert col.num_chunks() == 1
  
      s2 = pl.concat([s, s], rechunk=False)
      col2 = s2.to_frame().__dataframe__().get_column(0)
      assert col2.num_chunks() == 2
  
imports: from __future__ import annotations
  from datetime import datetime
  from typing import TYPE_CHECKING
  import pytest
  import polars
  from polars.interchange.column import PolarsColumn
  from polars.interchange.protocol import ColumnNullType, CopyNotAllowedError, DtypeKind
  from polars.testing import assert_series_equal
label_desc: Use image node_id 14 for calling a global function with example usage: test_num_chunks() without return types