code: def test_series_with_nulls_where(fill_value):
      psr = pd.Series([None] * 3 + list(range(5)))
      sr = cudf.from_pandas(psr)
  
      expect = psr.where(psr > 0, fill_value)
      got = sr.where(sr > 0, fill_value)
      assert_eq(expect, got)
  
      expect = psr.where(psr < 0, fill_value)
      got = sr.where(sr < 0, fill_value)
      assert_eq(expect, got)
  
      expect = psr.where(psr == 0, fill_value)
      got = sr.where(sr == 0, fill_value)
      assert_eq(expect, got)
  
imports: import re
  from decimal import Decimal
  import numpy
  import pandas
  import pytest
  import cudf
  from cudf.core._compat import PANDAS_GE_134, PANDAS_GE_150
  from cudf.core.dtypes import Decimal32Dtype, Decimal64Dtype, Decimal128Dtype
  from cudf.testing._utils import INTEGER_TYPES, NUMERIC_TYPES, assert_eq, assert_exceptions_equal
label_desc: Use image node_id 16 for calling a global function with example usage: test_series_with_nulls_where(fill_value) without return types