Update the new endpoint to return a 404 if the job or service id are not found.

All our endpoint should perform a check that the params are valid - this is an easy whay to check that and is standard for our endpoints.
I reverted the query to just filter by job id.

app/dao/notifications_dao.py

@@ -179,8 +179,8 @@ def get_notifications_for_job(service_id, job_id, filter_dict=None, page=1, page
 
 
 @statsd(namespace="dao")
-def dao_get_notification_count_for_job_id(*, service_id, job_id):
-    return Notification.query.filter_by(service_id=service_id, job_id=job_id).count()
+def dao_get_notification_count_for_job_id(*, job_id):
+    return Notification.query.filter_by(job_id=job_id).count()
 
 
 @statsd(namespace="dao")

app/job/rest.py

@@ -110,7 +110,8 @@ def get_all_notifications_for_service_job(service_id, job_id):
 
 @job_blueprint.route('/<job_id>/notification_count', methods=['GET'])
 def get_notification_count_for_job_id(service_id, job_id):
-    count = dao_get_notification_count_for_job_id(service_id=service_id, job_id=job_id)
+    dao_get_job_by_service_id_and_job_id(service_id, job_id)
+    count = dao_get_notification_count_for_job_id(job_id=job_id)
     return jsonify(
         count=count
     ), 200

tests/app/dao/notification_dao/test_notification_dao.py

@@ -555,7 +555,7 @@ def test_get_all_notifications_for_job_by_status(sample_job):
     assert len(notifications(filter_dict={'status': NOTIFICATION_STATUS_TYPES[:3]}).items) == 3
 
 
-def test_dao_get_notification_count_for_job_id(notify_db_session, notify_db):
+def test_dao_get_notification_count_for_job_id(notify_db_session):
     service = create_service()
     template = create_template(service)
     job = create_job(template, notification_count=3)
@@ -564,27 +564,16 @@ def test_dao_get_notification_count_for_job_id(notify_db_session, notify_db):
 
     create_notification(template)
 
-    assert dao_get_notification_count_for_job_id(service_id=service.id, job_id=job.id) == 3
+    assert dao_get_notification_count_for_job_id(job_id=job.id) == 3
 
 
-def test_dao_get_notification_count_for_job_id_only_finds_notification_already_in_db(notify_db_session, notify_db):
+def test_dao_get_notification_count_for_job_id_returns_zero_for_no_notifications_for_job(notify_db_session):
     service = create_service()
     template = create_template(service)
     job = create_job(template, notification_count=3)
     create_notification(template)
 
-    assert dao_get_notification_count_for_job_id(service_id=service.id, job_id=job.id) == 0
-
-
-def test_dao_get_notification_count_for_job_id_doesnt_work_with_non_existing_service_id(notify_db_session, notify_db):
-    service = create_service()
-    template = create_template(service)
-    job = create_job(template, notification_count=3)
-    for i in range(3):
-        create_notification(job=job)
-    fake_service_id = str(uuid.uuid4())
-
-    assert dao_get_notification_count_for_job_id(service_id=fake_service_id, job_id=job.id) == 0
+    assert dao_get_notification_count_for_job_id(job_id=job.id) == 0
 
 
 def test_update_notification_sets_status(sample_notification):

tests/app/job/test_rest.py

@@ -563,15 +563,28 @@ def test_get_all_notifications_for_job_returns_correct_format(
     assert resp['notifications'][0]['status'] == sample_notification_with_job.status
 
 
-def test_get_notification_count_for_job_id(admin_request, mocker):
+def test_get_notification_count_for_job_id(admin_request, mocker, sample_job):
     mock_dao = mocker.patch('app.job.rest.dao_get_notification_count_for_job_id', return_value=3)
-    job_id = uuid.uuid4()
-    service_id = uuid.uuid4()
-    response = admin_request.get('job.get_notification_count_for_job_id', service_id=service_id, job_id=job_id)
-    mock_dao.assert_called_once_with(service_id=service_id, job_id=str(job_id))
+    response = admin_request.get('job.get_notification_count_for_job_id',
+                                 service_id=sample_job.service_id, job_id=sample_job.id)
+    mock_dao.assert_called_once_with(job_id=str(sample_job.id))
     assert response["count"] == 3
 
 
+def test_get_notification_count_for_job_id_for_wrong_service_id(admin_request, sample_job):
+    service_id = uuid.uuid4()
+    response = admin_request.get('job.get_notification_count_for_job_id', service_id=service_id,
+                                 job_id=sample_job.id, _expected_status=404)
+    assert response['message'] == 'No result found'
+
+
+def test_get_notification_count_for_job_id_for_wrong_job_id(admin_request, sample_service):
+    job_id = uuid.uuid4()
+    response = admin_request.get('job.get_notification_count_for_job_id', service_id=sample_service.id,
+                                 job_id=job_id, _expected_status=404)
+    assert response['message'] == 'No result found'
+
+
 def test_get_job_by_id(admin_request, sample_job):
     job_id = str(sample_job.id)
     service_id = sample_job.service.id