110067722: Create the model and dao for services.

This commit creates the data model for services and user_to_service.
The dao is also created to insert, get, activate, and unrestrict the service.

tests/app/main/dao/test_service_dao.py

@@ -0,0 +1,39 @@
+from app.main.dao import services_dao
+from tests.app.main import create_test_user
+
+
+def test_can_insert_and_retrieve_new_service(notifications_admin, notifications_admin_db, notify_db_session):
+    user = create_test_user()
+
+    id = services_dao.insert_new_service('testing service', user)
+    saved_service = services_dao.get_service_by_id(id)
+    assert id == saved_service.id
+    assert saved_service.users == [user]
+    assert saved_service.name == 'testing service'
+
+
+def test_unrestrict_service_updates_the_service(notifications_admin, notifications_admin_db, notify_db_session):
+    user = create_test_user()
+    id = services_dao.insert_new_service('unrestricted service', user)
+    saved_service = services_dao.get_service_by_id(id)
+    assert saved_service.restricted is True
+    services_dao.unrestrict_service(id)
+    unrestricted_service = services_dao.get_service_by_id(id)
+    assert unrestricted_service.restricted is False
+
+
+def test_activate_service_update_service(notifications_admin, notifications_admin_db, notify_db_session):
+    user = create_test_user()
+    id = services_dao.insert_new_service('activated service', user)
+    service = services_dao.get_service_by_id(id)
+    assert service.active is False
+    services_dao.activate_service(id)
+    activated_service = services_dao.get_service_by_id(id)
+    assert activated_service.active is True
+
+
+def test_get_service_returns_none_if_service_does_not_exist(notifications_admin,
+                                                            notifications_admin_db,
+                                                            notify_db_session):
+    service = services_dao.get_service_by_id(1)
+    assert service is None