[WIP] Start of user accepting invite.

This commit only deals with acceptance by
users who are already in system.

Changed invite client to return invited user objects
instead of dictionaries.

Added commented out test. fixed up fixtures to return invited user
object for invites

app/notify_client/invite_api_client.py

@@ -1,6 +1,5 @@
-
 from notifications_python_client.base import BaseAPIClient
-from app.notify_client.models import User
+from app.notify_client.models import InvitedUser
 
 
 class InviteApiClient(BaseAPIClient):
@@ -22,9 +21,23 @@ class InviteApiClient(BaseAPIClient):
             'permissions': permissions
         }
         resp = self.post(url='/service/{}/invite'.format(service_id), data=data)
-        return resp['data']
+        return InvitedUser(**resp['data'])
 
     def get_invites_for_service(self, service_id):
         endpoint = '/service/{}/invite'.format(service_id)
         resp = self.get(endpoint)
-        return [User(data) for data in resp['data']]
+        invites = resp['data']
+        invited_users = _get_invited_users(invites)
+        return invited_users
+
+    def accept_invite(self, token):
+        resp = self.get(url='/invite/{}'.format(token))
+        return InvitedUser(**resp['data'])
+
+
+def _get_invited_users(invites):
+    invited_users = []
+    for invite in invites:
+        invited_user = InvitedUser(**invite)
+        invited_users.append(invited_user)
+    return invited_users