fix tests

tests/unit/test_decorator.py

         response = func(42)
         assert HTTPStatus.INTERNAL_SERVER_ERROR == response.status_code
         assert {
-                   'details': {},
+                   'details': {'error_detail': {}},
                    'message': 'We are testing',
                    'code': None,
                } == json.loads(response.body)
         assert response.status_code == HTTPStatus.INTERNAL_SERVER_ERROR
         assert {
             'message': 'We are testing',
-            'details': {'foo': 'bar'},
+            'details': {'error_detail': {'foo': 'bar'}},
             'code': None,
         } == json.loads(response.body)