Handle errors where the notification isn't found when executing the tasks

- Thows a NoResultFound sqlalchemy exception
- Which causes a retry. This means we give it a few goes (5, max 5 hours)  for the notification to appear.
- Should never happen, only if we get some task overlaps that are unusual that leads to tasks executed in an overlapping nature.

tests/app/celery/test_provider_tasks.py

@@ -1,9 +1,10 @@
 from celery.exceptions import MaxRetriesExceededError
 from app.celery import provider_tasks
-from app.celery.provider_tasks import send_sms_to_provider, send_email_to_provider
+from app.celery.provider_tasks import send_sms_to_provider, send_email_to_provider, deliver_sms, deliver_email
 from app.clients.email import EmailClientException
 from app.models import Notification
 from tests.app.conftest import sample_notification
+import app
 
 
 def test_should_have_decorated_tasks_functions():
@@ -39,12 +40,116 @@ def test_should_by_240_minute_delay_on_retry_two():
     assert provider_tasks.retry_iteration_to_delay(4) == 14400
 
 
+def test_should_call_send_sms_to_provider_from_deliver_sms_task(
+        notify_db,
+        notify_db_session,
+        sample_notification,
+        mocker):
+    mocker.patch('app.delivery.send_to_providers.send_sms_to_provider')
+
+    deliver_sms(sample_notification.id)
+    app.delivery.send_to_providers.send_sms_to_provider.assert_called_with(sample_notification)
+
+
+def test_should_add_to_retry_queue_if_notification_not_found_in_deliver_sms_task(
+        notify_db,
+        notify_db_session,
+        mocker):
+    mocker.patch('app.delivery.send_to_providers.send_sms_to_provider')
+    mocker.patch('app.celery.provider_tasks.deliver_sms.retry')
+
+    notification_id = app.create_uuid()
+
+    deliver_sms(notification_id)
+    app.delivery.send_to_providers.send_sms_to_provider.assert_not_called()
+    app.celery.provider_tasks.deliver_sms.retry.assert_called_with(queue="retry", countdown=10)
+
+
+def test_should_call_send_sms_to_provider_from_send_sms_to_provider_task(
+    notify_db,
+    notify_db_session,
+    sample_notification,
+    mocker):
+
+    mocker.patch('app.delivery.send_to_providers.send_sms_to_provider')
+
+    send_sms_to_provider(sample_notification.service_id, sample_notification.id)
+    app.delivery.send_to_providers.send_sms_to_provider.assert_called_with(sample_notification)
+
+
+def test_should_add_to_retry_queue_if_notification_not_found_in_send_sms_to_provider_task(
+        notify_db,
+        notify_db_session,
+        mocker):
+    mocker.patch('app.delivery.send_to_providers.send_sms_to_provider')
+    mocker.patch('app.celery.provider_tasks.send_sms_to_provider.retry')
+
+    notification_id = app.create_uuid()
+    service_id = app.create_uuid()
+
+    send_sms_to_provider(service_id, notification_id)
+    app.delivery.send_to_providers.send_sms_to_provider.assert_not_called()
+    app.celery.provider_tasks.send_sms_to_provider.retry.assert_called_with(queue="retry", countdown=10)
+
+
+def test_should_call_send_email_to_provider_from_deliver_email_task(
+    notify_db,
+    notify_db_session,
+    sample_notification,
+    mocker):
+
+    mocker.patch('app.delivery.send_to_providers.send_email_to_provider')
+
+    deliver_email(sample_notification.id)
+    app.delivery.send_to_providers.send_email_to_provider.assert_called_with(sample_notification)
+
+
+def test_should_add_to_retry_queue_if_notification_not_found_in_deliver_email_task(
+        notify_db,
+        notify_db_session,
+        mocker):
+    mocker.patch('app.delivery.send_to_providers.send_email_to_provider')
+    mocker.patch('app.celery.provider_tasks.deliver_email.retry')
+
+    notification_id = app.create_uuid()
+
+    deliver_email(notification_id)
+    app.delivery.send_to_providers.send_email_to_provider.assert_not_called()
+    app.celery.provider_tasks.deliver_email.retry.assert_called_with(queue="retry", countdown=10)
+
+
+def test_should_call_send_email_to_provider_from_email_task(
+    notify_db,
+    notify_db_session,
+    sample_notification,
+    mocker):
+
+    mocker.patch('app.delivery.send_to_providers.send_email_to_provider')
+
+    send_email_to_provider(sample_notification.service_id, sample_notification.id)
+    app.delivery.send_to_providers.send_email_to_provider.assert_called_with(sample_notification)
+
+
+def test_should_add_to_retry_queue_if_notification_not_found_in_send_email_to_provider_task(
+        notify_db,
+        notify_db_session,
+        mocker):
+    mocker.patch('app.delivery.send_to_providers.send_email_to_provider')
+    mocker.patch('app.celery.provider_tasks.send_email_to_provider.retry')
+
+    notification_id = app.create_uuid()
+    service_id = app.create_uuid()
+
+    send_email_to_provider(service_id, notification_id)
+    app.delivery.send_to_providers.send_email_to_provider.assert_not_called()
+    app.celery.provider_tasks.send_email_to_provider.retry.assert_called_with(queue="retry", countdown=10)
+
+
 def test_should_go_into_technical_error_if_exceeds_retries(
         notify_db,
         notify_db_session,
         sample_service,
         mocker):
-
     notification = sample_notification(notify_db=notify_db, notify_db_session=notify_db_session,
                                        service=sample_service, status='created')
 
@@ -68,7 +173,6 @@ def test_send_email_to_provider_should_go_into_technical_error_if_exceeds_retrie
         sample_service,
         sample_email_template,
         mocker):
-
     notification = sample_notification(notify_db=notify_db, notify_db_session=notify_db_session,
                                        service=sample_service, status='created', template=sample_email_template)