code: def test_onehost_get_dummies_dummy_na(nan_as_null, dummy_na):
      pdf = pd.DataFrame({"a": [0, 1, np.nan]})
      df = cudf.DataFrame.from_pandas(pdf, nan_as_null=nan_as_null)
  
      expected = pd.get_dummies(pdf, dummy_na=dummy_na, columns=["a"])
      with pytest.warns(FutureWarning):
          actual = cudf.get_dummies(
              df, dummy_na=dummy_na, columns=["a"]
          )
  
      if dummy_na and nan_as_null:
          actual = actual.rename(columns={"a_<NA>": "a_nan"})[
              expected.columns
          ]
  
      assert_eq(expected, actual)
  
file_path: cudf/python/cudf/cudf/tests/test_onehot.py
imports: from string import ascii_lowercase
  import numpy
  import pandas
  import pytest
  import cudf
  from cudf.testing._utils import assert_eq
label_desc: Use image node_id 3 for calling a global function with example usage: test_onehost_get_dummies_dummy_na(nan_as_null, dummy_na) without return types