code: def test_user_agent_custom(self):
      geocoder = Here(
          apikey="DUMMYKEY1234", user_agent="my_user_agent/1.0"
      )
      assert geocoder.headers["User-Agent"] == "my_user_agent/1.0"
  
imports: import warnings
  import pytest
  from geopy import exc
  from geopy.geocoders import Here, HereV7
  from geopy.point import Point
  from test.geocoders.util import BaseTestGeocoder, env
label_desc: Use image node_id 1 for calling the TestUnitHere obj's underlying member method code with example usage: obj.test_user_agent_custom() without return types