code: def test_read_json_backend_dispatch(tmp_path):
      # Test ddf.read_json cudf-backend dispatch
      df1 = dask.datasets.timeseries(
          dtypes={"x": int, "y": int}, freq="120s"
      ).reset_index(drop=True)
      json_path = str(tmp_path / "data-*.json")
      df1.to_json(json_path)
      with dask.config.set({"dataframe.backend": "cudf"}):
          df2 = dd.read_json(json_path)
      assert isinstance(df2, dask_cudf.DataFrame)
      dd.assert_eq(df1, df2)
  
file_path: cudf/python/dask_cudf/dask_cudf/io/tests/test_json.py
imports: import os
  import pandas
  import pytest
  import dask
  import dask.dataframe
  from dask.utils import tmpfile
  import dask_cudf
label_desc: Use image node_id 1 for calling a global function with example usage: test_read_json_backend_dispatch(tmp_path) without return types