add public contract tests

use jsonschema to test the GET /notification/{} endpoint to highlight any key name/format/type changes

tests/app/public_contracts/test_GET_notification.py

@@ -0,0 +1,30 @@
+import os
+
+from flask import json
+import jsonschema
+
+from tests import create_authorization_header
+
+
+def test_get_sms_contract(client, sample_notification):
+    auth_header = create_authorization_header(service_id=sample_notification.service_id)
+    response = client.get('/notifications/{}'.format(sample_notification.id), headers=[auth_header])
+
+    with open(os.path.join(os.path.dirname(__file__), './GET_notification_return_sms.json')) as schema:
+        jsonschema.validate(
+            json.loads(response.get_data(as_text=True)),
+            json.load(schema),
+            format_checker=jsonschema.FormatChecker()
+        )
+
+
+def test_get_email_contract(client, sample_email_notification):
+    auth_header = create_authorization_header(service_id=sample_email_notification.service_id)
+    response = client.get('/notifications/{}'.format(sample_email_notification.id), headers=[auth_header])
+
+    with open(os.path.join(os.path.dirname(__file__), './GET_notification_return_email.json')) as schema:
+        jsonschema.validate(
+            json.loads(response.get_data(as_text=True)),
+            json.load(schema),
+            format_checker=jsonschema.FormatChecker()
+        )