code: def test_to_csv(df):
      exp = (
          "geometry,value1,value2\nPOINT (0 0),0,1\nPOINT (1 1),1,2\nPOINT (2 2),2,1\n"
      ).replace("\n", os.linesep)
      assert df.to_csv(index=False) == exp
  
imports: import os
  from packaging.version import Version
  import warnings
  import numpy
  from numpy.testing import assert_array_equal
  import pandas
  import shapely
  from shapely.geometry import Point, GeometryCollection, LineString, LinearRing
  import geopandas
  from geopandas import GeoDataFrame, GeoSeries
  import geopandas._compat
  from geopandas.array import from_shapely
  from geopandas.testing import assert_geodataframe_equal, assert_geoseries_equal
  from pandas.testing import assert_frame_equal, assert_series_equal
  import pytest
label_desc: Use image node_id 17 for calling a global function with example usage: test_to_csv(df) without return types