'Test that the signin form has a different label is
``USERENA_WITHOUT_USERNAME`` is set to ``True``'

def test_signin_form_email(self):

    userena_settings.USERENA_WITHOUT_USERNAMES = True
    form = forms.AuthenticationForm(data={u'identification': u'john', u'password': u'blowfish'})
    correct_label = u'Email'
    self.assertEqual(form.fields[u'identification'].label, correct_label)
    userena_settings.USERENA_WITHOUT_USERNAMES = False
