new_contents: from django.template import Context, Template
  from django.test import TestCase
  
  template = '{% load jsonify %}{{ content | jsonify:2 }}'
  
  template_html = '''[
    "foo",
    "bar",
    "ba<"
  ]'''
  
  
  class MarkdownTestCase(TestCase):
      def test_markdown(self):
          data = {
              'content': [
                  'foo',
                  'bar',
                  'ba<'
              ],
          }
          html = Template(template).render(Context(data))
          self.assertEqual(html, template_html)
  
subject: Add test_jsonify.py