Added dao, test framework and tests for dao.

tests/app/conftest.py

@@ -0,0 +1,22 @@
+import pytest
+from app.main.dao.users_dao import (create_user, get_users)
+from app.main.dao.services_dao import (create_service, get_services)
+
+
+@pytest.fixture(scope='function')
+def sample_user(notify_db,
+                notify_db_session,
+                email="notify@digital.cabinet-office.gov.uk"):
+    user_id = create_user(email)
+    return get_users(user_id=user_id)
+
+
+@pytest.fixture(scope='function')
+def sample_service(notify_db,
+                   notify_db_session,
+                   service_name="Sample service",
+                   user=None):
+    if user is None:
+        user = sample_user(notify_db, notify_db_session)
+    service_id = create_service(service_name, user)
+    return get_services(service_id=service_id)