new_contents: """
  Tests for the Google Analytics template tags and filters, using the new gtag.js library.
  """
  
  from django.http import HttpRequest
  from django.template import Context
  from django.test.utils import override_settings
  
  from analytical.templatetags.google_analytics_gtag import GoogleAnalyticsGTagNode
  from analytical.tests.utils import TagTestCase
  from analytical.utils import AnalyticalException
  
  
  @override_settings(GOOGLE_ANALYTICS_GTAG_PROPERTY_ID='UA-123456-7')
  class GoogleAnalyticsTagTestCase(TagTestCase):
      """
      Tests for the ``google_analytics_js`` template tag.
      """
  
      def test_tag(self):
          r = self.render_tag('google_analytics_gtag', 'google_analytics_gtag')
          self.assertTrue("""<script async src="https://www.googletagmanager.com/gtag/js?id=UA-123456-7"></script>""" in r, r)
          self.assertTrue("gtag('js', new Date());" in r, r)
          self.assertTrue("gtag('config', 'UA-123456-7');" in r, r)
  
      def test_node(self):
          r = GoogleAnalyticsGTagNode().render(Context())
          self.assertTrue("""<script async src="https://www.googletagmanager.com/gtag/js?id=UA-123456-7"></script>""" in r, r)
          self.assertTrue("gtag('js', new Date());" in r, r)
          self.assertTrue("gtag('config', 'UA-123456-7');" in r, r)
  
      @override_settings(GOOGLE_ANALYTICS_GTAG_PROPERTY_ID=None)
      def test_no_property_id(self):
          self.assertRaises(AnalyticalException, GoogleAnalyticsGTagNode)
  
      @override_settings(GOOGLE_ANALYTICS_GTAG_PROPERTY_ID='wrong')
      def test_wrong_property_id(self):
          self.assertRaises(AnalyticalException, GoogleAnalyticsGTagNode)
  
      @override_settings(ANALYTICAL_INTERNAL_IPS=['1.1.1.1'])
      def test_render_internal_ip(self):
          req = HttpRequest()
          req.META['REMOTE_ADDR'] = '1.1.1.1'
          context = Context({'request': req})
          r = GoogleAnalyticsGTagNode().render(context)
          self.assertTrue(r.startswith(
              '<!-- Google Analytics disabled on internal IP address'), r)
          self.assertTrue(r.endswith('-->'), r)
  
subject: Add tests for new Google Analytics gtag, #108