old_contents: from django.test import TestCase
  
  # Create your tests here.
  
new_contents: from django.test import TestCase
  from .views import ChartsView
  
  # Create your tests here.
  class TestVegaLiteChartsView(TestCase):
      def setUpTestCase(self):
          self.chart_view = ChartsView()
  
          # Set Vega Lite as template engine
          self.chart_view.engine = "vegalite"
  
      def test_vega_lite_template(self):
          # URL for Vega Lite chart URL
          vega_lite_template_url = "chartflo/vegalite/chart.html"
  
          # Get chart view template URL
          chart_view_template_url = self.chart_view._get_template_url()
  
          # Make sure Chart View URL matches Vega Lite chart URL
          self.assertEqual(chart_view_template_url, vega_lite_template_url)
  
subject: Add Vega Lite template test