[Inline model resolver] better handling of inline responses and bug fixes (#12353)

* better handling of inline response schemas, bug fixes

* update samples

* add new files

* better code format

* remove unused ruby files

* fix java test

* remove unused js spec files

* remove inline_response_default_test.dart

* fix webclient tests

* fix spring tests

samples/openapi3/client/petstore/python-legacy/test/test_foo_get_default_response.py

@@ -0,0 +1,52 @@
+# coding: utf-8
+
+"""
+    OpenAPI Petstore
+
+    This spec is mainly for testing Petstore server and contains fake endpoints, models. Please do not use this for any other purpose. Special characters: \" \\  # noqa: E501
+
+    The version of the OpenAPI document: 1.0.0
+    Generated by: https://openapi-generator.tech
+"""
+
+
+from __future__ import absolute_import
+
+import unittest
+import datetime
+
+import petstore_api
+from petstore_api.models.foo_get_default_response import FooGetDefaultResponse  # noqa: E501
+from petstore_api.rest import ApiException
+
+class TestFooGetDefaultResponse(unittest.TestCase):
+    """FooGetDefaultResponse unit test stubs"""
+
+    def setUp(self):
+        pass
+
+    def tearDown(self):
+        pass
+
+    def make_instance(self, include_optional):
+        """Test FooGetDefaultResponse
+            include_option is a boolean, when False only required
+            params are included, when True both required and
+            optional params are included """
+        # model = petstore_api.models.foo_get_default_response.FooGetDefaultResponse()  # noqa: E501
+        if include_optional :
+            return FooGetDefaultResponse(
+                string = petstore_api.models.foo.Foo(
+                    bar = 'bar', )
+            )
+        else :
+            return FooGetDefaultResponse(
+        )
+
+    def testFooGetDefaultResponse(self):
+        """Test FooGetDefaultResponse"""
+        inst_req_only = self.make_instance(include_optional=False)
+        inst_req_and_optional = self.make_instance(include_optional=True)
+
+if __name__ == '__main__':
+    unittest.main()