'Testing if extent supports limit.'

@skipUnlessDBFeature('supports_extent_aggr')
def test_extent_with_limit(self):

    extent1 = City.objects.all().aggregate(Extent('point'))['point__extent']
    extent2 = City.objects.all()[:3].aggregate(Extent('point'))['point__extent']
    self.assertNotEqual(extent1, extent2)
