Error handler for schema validation errors

app/v2/errors.py

@@ -1,5 +1,8 @@
+import json
+
 from flask import jsonify, current_app
-from sqlalchemy.exc import SQLAlchemyError, DataError
+from jsonschema import ValidationError
+from sqlalchemy.exc import DataError
 from sqlalchemy.orm.exc import NoResultFound
 
 from app.authentication.auth import AuthError
@@ -35,6 +38,11 @@ def register_errors(blueprint):
         response = jsonify(error.to_dict_v2()), error.status_code
         return response
 
+    @blueprint.errorhandler(ValidationError)
+    def validation_error(error):
+        current_app.logger.exception(error)
+        return jsonify(json.loads(error.message)), 400
+
     @blueprint.errorhandler(NoResultFound)
     @blueprint.errorhandler(DataError)
     def no_result_found(e):

tests/app/v2/notifications/test_post_notifications.py

@@ -53,10 +53,9 @@ def test_post_sms_notification_returns_404_and_missing_template(notify_api, samp
             assert error_json['link'] == 'link to documentation'
 
 
-def test_post_sms_notification_returns_403_and_well_formed_auth_error(notify_api, sample_template, mocker):
+def test_post_sms_notification_returns_403_and_well_formed_auth_error(notify_api, sample_template):
     with notify_api.test_request_context():
         with notify_api.test_client() as client:
-            mocked = mocker.patch('app.celery.provider_tasks.deliver_sms.apply_async')
             data = {
                 'phone_number': '+447700900855',
                 'template_id': str(sample_template.id)
@@ -72,3 +71,26 @@ def test_post_sms_notification_returns_403_and_well_formed_auth_error(notify_api
             error_resp = json.loads(response.get_data(as_text=True))
             assert error_resp['code'] == 401
             assert error_resp['message'] == {'token': ['Unauthorized, authentication token must be provided']}
+
+
+def test_post_sms_notification_returns_400_and_for_schema_problems(notify_api, sample_template):
+    with notify_api.test_request_context():
+        with notify_api.test_client() as client:
+            data = {
+                'phone_number': '+447700900855',
+                'template': str(sample_template.id)
+            }
+            auth_header = create_authorization_header(service_id=sample_template.service_id)
+
+            response = client.post(
+                path='/v2/notifications/sms',
+                data=json.dumps(data),
+                headers=[('Content-Type', 'application/json'), auth_header])
+
+            assert response.status_code == 400
+            assert response.headers['Content-type'] == 'application/json'
+            error_resp = json.loads(response.get_data(as_text=True))
+            assert error_resp['code'] == '1001'
+            assert error_resp['message'] == 'Validation error occurred - POST v2/notifications/sms'
+            assert error_resp['link'] == "link to error documentation (not yet implemented)"
+            assert error_resp['fields'] == ["'template_id' is a required property"]