code: def test_no_crs():
      df1 = GeoDataFrame({"col1": [1, 2], "geometry": s1}, crs=None)
      df2 = GeoDataFrame({"col1": [1, 2], "geometry": s1}, crs={})
      assert_geodataframe_equal(df1, df2)
  
file_path: geopandas/geopandas/tests/test_testing.py
imports: import warnings
  import numpy
  from shapely.geometry import Point, Polygon
  import pandas
  from pandas import DataFrame, Series
  from geopandas import GeoDataFrame, GeoSeries
  from geopandas.array import from_shapely
  from geopandas.testing import assert_geodataframe_equal, assert_geoseries_equal
  import pytest
label_desc: Use image node_id 4 for calling a global function with example usage: test_no_crs() without return types