code: def test_concat(self):
      s = GeoSeries(self.arr, crs=27700)
      assert pd.concat([s, s]).values.crs == self.osgb
  
      df = GeoDataFrame(
          {"col1": from_shapely(self.geoms, crs=4326)}, geometry=s
      )
      assert pd.concat([df, df]).geometry.values.crs == self.osgb
      assert pd.concat([df, df]).col1.values.crs == self.wgs
  
imports: import random
  import warnings
  import numpy
  import pandas
  import pyproj
  import pytest
  from shapely.geometry import Point, Polygon, LineString
  from geopandas import GeoSeries, GeoDataFrame, points_from_xy, read_file
  from geopandas.array import from_shapely, from_wkb, from_wkt, GeometryArray
  from geopandas.testing import assert_geodataframe_equal
label_desc: Use image node_id 28 for calling the TestGeometryArrayCRS obj's underlying member method code with example usage: obj.test_concat() without return types