'``SupervisedRegistrationProfile.send_admin_approve_complete_email``
sends a plain text email if settings.REGISTRATION_EMAIL_HTML is False.'

def test_admin_approval_complete_email_is_plain_text_if_html_disabled(self):

    settings.REGISTRATION_EMAIL_HTML = False
    new_user = UserModel().objects.create_user(**self.user_info)
    profile = self.registration_profile.objects.create_profile(new_user)
    profile.send_admin_approve_complete_email(Site.objects.get_current())
    self.assertEqual(len(mail.outbox), 1)
    self.assertEqual(len(mail.outbox[0].alternatives), 0)
