code: def test_list_unique() -> None:
      s = pl.Series([[1, 1, 2, 2, 3], [3, 3, 3, 2, 1, 2]])
      result = s.list.unique(maintain_order=True)
      expected = pl.Series([[1, 2, 3], [3, 2, 1]])
      assert_series_equal(result, expected)
  
imports: from __future__ import annotations
  from datetime import date, datetime
  import numpy
  import pytest
  import polars
  from polars.testing import assert_frame_equal, assert_series_equal
label_desc: Use image node_id 26 for calling a global function with example usage: test_list_unique() without return types