code: def test_cudf_json_writer_sinks(sink, tmp_path_factory):
      df = cudf.DataFrame({"a": [1, 2, 3], "b": [4, 5, 6]})
      target = None
      if sink == "string":
          target = StringIO()
      elif sink == "file":
          target = tmp_path_factory.mktemp("json") / "test_df.json"
      df.to_json(target, engine="cudf")
      if sink == "string":
          assert (
              target.getvalue()
              == '[{"a":1,"b":4},{"a":2,"b":5},{"a":3,"b":6}]'
          )
      elif sink == "file":
          assert os.path.exists(target)
          with open(target, "r") as f:
              assert (
                  f.read()
                  == '[{"a":1,"b":4},{"a":2,"b":5},{"a":3,"b":6}]'
              )
  
imports: import copy
  import gzip
  import itertools
  import os
  from io import BytesIO, StringIO
  from pathlib import Path
  import numpy
  import pandas
  import pyarrow
  import pytest
  import cudf
  from cudf.testing._utils import DATETIME_TYPES, NUMERIC_TYPES, TIMEDELTA_TYPES, assert_eq
label_desc: Use image node_id 11 for calling a global function with example usage: test_cudf_json_writer_sinks(sink, tmp_path_factory) without return types