text: from __future__ import unicode_literals
  
  from django.contrib.gis.geos import HAS_GEOS
  from django.test import TestCase, override_settings, skipUnlessDBFeature
  
  if HAS_GEOS:
      from django.contrib.gis import admin
      from django.contrib.gis.geos import Point
  
      from .models import City
  
  
  @skipUnlessDBFeature("gis_enabled")
  @override_settings(ROOT_URLCONF='django.contrib.gis.tests.geoadmin.urls')
  class GeoAdminTest(TestCase):
  
      def test_ensure_geographic_media(self):
          geoadmin = admin.site._registry[City]
          admin_js = geoadmin.media.render_js()
          self.assertTrue(any(geoadmin.openlayers_url in js for js in admin_js))
  
      def test_olmap_OSM_rendering(self):
          geoadmin = admin.site._registry[City]
          result = geoadmin.get_map_widget(City._meta.get_field('point'))(
          ).render('point', Point(-79.460734, 40.18476))
          self.assertIn(
              """geodjango_point.layers.base = new OpenLayers.Layer.OSM("OpenStreetMap (Mapnik)");""",
              result)
  
      def test_olmap_WMS_rendering(self):
          geoadmin = admin.GeoModelAdmin(City, admin.site)
          result = geoadmin.get_map_widget(City._meta.get_field('point'))(
          ).render('point', Point(-79.460734, 40.18476))
          self.assertIn(
              """geodjango_point.layers.base = new OpenLayers.Layer.WMS("OpenLayers WMS", "http://vmap0.tiles.osgeo.org/wms/vmap0", {layers: \'basic\', format: 'image/jpeg'});""",
              result)
  
      def test_olwidget_has_changed(self):
          """
          Check that changes are accurately noticed by OpenLayersWidget.
          """
          geoadmin = admin.site._registry[City]
          form = geoadmin.get_changelist_form(None)()
          has_changed = form.fields['point'].has_changed
  
          initial = Point(13.4197458572965953, 52.5194108501149799, srid=4326)
          data_same = "SRID=3857;POINT(1493879.2754093995 6894592.019687599)"
          data_almost_same = "SRID=3857;POINT(1493879.2754093990 6894592.019687590)"
          data_changed = "SRID=3857;POINT(1493884.0527237 6894593.8111804)"
  
          self.assertTrue(has_changed(None, data_changed))
          self.assertTrue(has_changed(initial, ""))
          self.assertFalse(has_changed(None, ""))
          self.assertFalse(has_changed(initial, data_same))
          self.assertFalse(has_changed(initial, data_almost_same))
          self.assertTrue(has_changed(initial, data_changed))
  