Add tests for python client with disallowAdditionalPropertiesIfNotPresent set to true (#16690)

* add tests for python client with different option

* update samples

* update tests

samples/client/echo_api/python-disallowAdditionalPropertiesIfNotPresent-true/test/test_bird.py

@@ -0,0 +1,56 @@
+# coding: utf-8
+
+"""
+    Echo Server API
+
+    Echo Server API  # noqa: E501
+
+    The version of the OpenAPI document: 0.1.0
+    Contact: team@openapitools.org
+    Generated by: https://openapi-generator.tech
+"""
+
+
+from __future__ import absolute_import
+
+import unittest
+import datetime
+
+import openapi_client
+from openapi_client.models.bird import Bird  # noqa: E501
+from openapi_client.rest import ApiException
+
+class TestBird(unittest.TestCase):
+    """Bird unit test stubs"""
+
+    def setUp(self):
+        pass
+
+    def tearDown(self):
+        pass
+
+    def make_instance(self, include_optional):
+        """Test Bird
+            include_option is a boolean, when False only required
+            params are included, when True both required and
+            optional params are included """
+        # uncomment below to create an instance of `Bird`
+        """
+        model = openapi_client.models.bird.Bird()  # noqa: E501
+        if include_optional :
+            return Bird(
+                size = '', 
+                color = ''
+            )
+        else :
+            return Bird(
+        )
+        """
+
+    def testBird(self):
+        """Test Bird"""
+        # inst_req_only = self.make_instance(include_optional=False)
+        # inst_req_and_optional = self.make_instance(include_optional=True)
+
+if __name__ == '__main__':
+    unittest.main()