from django                     import test
from django.utils.translation   import ugettext as _
from django.core                import mail
from appname.models             import User
from appname.tests.decorators   import as_guest, signed_as
from appname.tests.mixins       import AuthMixin

class ViewsAuthSignupTest(AuthMixin, test.TestCase):

    fixtures = ['test_data']

    # ...

    @signed_as('jeffrey.mercer@example.com')
    def test_signup_creates_user_with_groups(self):
        response = self.client.post('/auth/signup/', {
            'name': 'Jack Smith',
            'tax_code': 'JCKSMT91T31L781A',
            'email': 'jack.smith@example.com',
            'groups': # what here?
        }, follow = True)
        self.assertRedirects(response, '/')
        user = User.objects.get(email = 'jack.smith@example.com')
        self.assertEqual(user.groups.all().count(), 2)