new_contents: from django.test import TestCase
  from dojo.models import System_Settings
  
  
  class TestSystemSettings(TestCase):
  
      def test_system_settings_update(self):
          system_settings = System_Settings.objects.get()
          system_settings.enable_jira = True
          system_settings.save()
          system_settings = System_Settings.objects.get()
          self.assertEquals(system_settings.enable_jira, True)
  
          system_settings.enable_jira = False
          system_settings.save()
          system_settings = System_Settings.objects.get()
          self.assertEquals(system_settings.enable_jira, False)
  
          system_settings.enable_jira = True
          system_settings.save()
          system_settings = System_Settings.objects.get(no_cache=True)
          self.assertEquals(system_settings.enable_jira, True)
  
subject: add unittest for system_settings