Fix echo api

Author: EspenHa

samples/client/echo_api/python/tests/test_manual.py

@@ -16,6 +16,7 @@
 import datetime
 import base64
 import os
+import json
 
 import openapi_client
 from openapi_client import StringEnumRef
@@ -218,9 +219,9 @@ def test_from_to_methods(self):
         assert pet.category is not None
         self.assertEqual(pet.category.id, 1)
         # test to_json
-        self.assertEqual(pet.to_json(),
-                         '{"id": 1, "name": "test name", "category": {"id": 1, "name": "dog"}, "photoUrls": ['
-                         '"string"], "tags": [{"id": 1, "name": "None"}], "status": "available"}')
+        self.assertEqual(json.loads(pet.to_json()),
+                         {"id": 1, "name": "test name", "category": {"id": 1, "name": "dog"}, "photoUrls": ["string"],
+                          "tags": [{"id": 1, "name": "None"}], "status": "available"})
 
         # test to_dict
         self.assertEqual(pet.to_dict(),