code: def test_binary_stream_operators(stream):
      df = cudf.DataFrame({"x": [1, 2, 3], "y": [4, 5, 6]})
  
      expected = df.x + df.y
  
      a = DataFrame(example=df, stream=stream)
      b = (a.x + a.y).stream.gather().sink_to_list()
  
      a.emit(df)
  
      assert_eq(b[0], expected)
  
imports: import json
  import operator
  import numpy
  import pandas
  import pytest
  from dask.dataframe.utils import assert_eq
  from distributed import Client
  from streamz import Stream
  from streamz.dask import DaskStream
  from streamz.dataframe import Aggregation, DataFrame, DataFrames, Series
label_desc: Use image node_id 12 for calling a global function with example usage: test_binary_stream_operators(stream) without return types