diff --git a/samples/openapi3/client/petstore/python/tests/test_model.py b/samples/openapi3/client/petstore/python/tests/test_model.py
index 646755b7f1dd..b06eeaa0831f 100644
--- a/samples/openapi3/client/petstore/python/tests/test_model.py
+++ b/samples/openapi3/client/petstore/python/tests/test_model.py
@@ -392,6 +392,9 @@ def test_valdiator(self):
         a.pattern_with_digits_and_delimiter = "image_123"
         self.assertEqual(a.pattern_with_digits_and_delimiter, "image_123")
 
+        # test sanitize for serializaation with SecretStr (format: password)
+        self.assertEquals(petstore_api.ApiClient().sanitize_for_serialization(a), {'byte': b'string', 'date': '2013-09-17', 'number': 123.45, 'password': 'testing09876', 'pattern_with_digits_and_delimiter': 'image_123'})
+
     def test_inline_enum_validator(self):
         self.pet = petstore_api.Pet(name="test name", photoUrls=["string"])
         self.pet.id = 1