[WIP] added dao and rest endpoint for retrieving invited users

by service and by id.

tests/app/dao/test_invited_user_dao.py

@@ -1,7 +1,14 @@
+import uuid
+import pytest
+from sqlalchemy.orm.exc import NoResultFound
 
 from app.models import InvitedUser
 
-from app.dao.invited_user_dao import save_invited_user
+from app.dao.invited_user_dao import (
+    save_invited_user,
+    get_invited_user,
+    get_invited_users_for_service
+)
 
 
 def test_create_invited_user(notify_db, notify_db_session, sample_service):
@@ -21,3 +28,39 @@ def test_create_invited_user(notify_db, notify_db_session, sample_service):
     assert InvitedUser.query.count() == 1
     assert invited_user.email_address == email_address
     assert invited_user.from_user == invite_from
+
+
+def test_get_invited_user(notify_db, notify_db_session, sample_invited_user):
+    from_db = get_invited_user(sample_invited_user.service.id, sample_invited_user.id)
+    assert from_db == sample_invited_user
+
+
+def test_get_unknown_invited_user_throws_no_result_exception(notify_db, notify_db_session, sample_service):
+    unknown_id = uuid.uuid4()
+    with pytest.raises(NoResultFound):
+        get_invited_user(sample_service.id, unknown_id)
+
+
+def test_get_invited_users_for_service(notify_db, notify_db_session, sample_service):
+
+    from tests.app.conftest import sample_invited_user
+    invites = []
+    for i in range(0, 5):
+        email = 'invited_user_{}@service.gov.uk'.format(i)
+
+        invited_user = sample_invited_user(notify_db,
+                                           notify_db_session,
+                                           sample_service,
+                                           email)
+        invites.append(invited_user)
+
+    all_from_db = get_invited_users_for_service(sample_service.id)
+    assert len(all_from_db) == 5
+    for invite in invites:
+        assert invite in all_from_db
+
+
+def test_get_invited_users_for_service_that_has_no_invites(notify_db, notify_db_session, sample_service):
+
+    invites = get_invited_users_for_service(sample_service.id)
+    assert len(invites) == 0