data.update(overwrite_data) //overwrite any key in default if in data
signin_page = self.client.post(reverse("userena.views.signup"),data)
// check whether signin succeeded. If succeeded the response will be a
// httpResponseRedirect object, which has a "Location" key in its
// items(). Don"t know how to better check for type here.
list = [x[0] for x in signin_page.items()]
self.assertTrue("Location" in list, "could not create user. dumping"
" page:\n %s"
% signin_page.content)