code: def test_casting_to_an_enum_from_integer() -> None:
      dtype = pl.Enum(["a", "b", "c"])
      expected = pl.Series([None, "b", "a", "c"], dtype=dtype)
      s = pl.Series([None, 1, 0, 2], dtype=pl.UInt32)
      s_enum = s.cast(dtype)
      assert s_enum.dtype == dtype
      assert s_enum.null_count() == 1
      assert_series_equal(s_enum, expected)
  
imports: import operator
  from datetime import date
  from textwrap import dedent
  from typing import Any, Callable
  import pytest
  import polars
  from polars import StringCache
  from polars.testing import assert_series_equal
label_desc: Use image node_id 8 for calling a global function with example usage: test_casting_to_an_enum_from_integer() without return types