code: def test_json_lines_dtypes(json_input):
      df = cudf.read_json(
          json_input,
          lines=True,
          dtype={1: "int", 2: "short", 0: "float"},
      )
      assert all(df.dtypes == ["float64", "int64", "int16"])
  
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 17 for calling a global function with example usage: test_json_lines_dtypes(json_input) without return types