Fixed #16412 -- Prevented a `contrib.auth` test from failing in the potential...

            data = {'email': 'testclient@example.com'}

            form = PasswordResetForm(data)

            self.assertTrue(form.is_valid())

            form.save()

            # Since we're not providing a request object, we must provide a

            # domain_override to prevent the save operation from failing in the

            # potential case where contrib.sites is not installed. Refs #16412.

            form.save(domain_override='example.com')

            self.assertEqual(len(mail.outbox), 1)

            self.assertEqual(mail.outbox[0].subject, u'Custom password reset on example.com')