fix testing respone (#21687)

Author: devhl-labs

modules/openapi-generator/src/main/resources/csharp/libraries/generichost/api_test.mustache

@@ -37,14 +37,18 @@ namespace {{packageName}}.Test.{{apiPackage}}
             {{#allParams}}
             {{^required}}Client.Option<{{/required}}{{{dataType}}}{{>NullConditionalParameter}}{{^required}}>{{/required}} {{paramName}} = default{{nrt!}};
             {{/allParams}}
-            {{#returnType}}
+            {{#responses}}
+            {{#-first}}
+            {{#dataType}}
             var response = await _instance.{{operationId}}Async({{#allParams}}{{paramName}}{{^-last}}, {{/-last}}{{/allParams}});
-            var model = response.{{#lambda.first}}{{#responses}}{{vendorExtensions.x-http-status}}  {{/responses}}{{/lambda.first}}();
+            var model = response.{{vendorExtensions.x-http-status}}();
             Assert.IsType<{{{.}}}>(model);
-            {{/returnType}}
-            {{^returnType}}
+            {{/dataType}}
+            {{^dataType}}
             await _instance.{{operationId}}Async({{#allParams}}{{paramName}}{{^-last}}, {{/-last}}{{/allParams}});
-            {{/returnType}}
+            {{/dataType}}
+            {{/-first}}
+            {{/responses}}
         }
         {{/operation}}
         {{/operations}}

modules/openapi-generator/src/test/resources/3_0/csharp/petstore-with-fake-endpoints-models-for-testing-with-http-signature.yaml

@@ -612,6 +612,19 @@ paths:
         - api_key_query: []
       requestBody:
         $ref: '#/components/requestBodies/Client'
+  /redirectOrDefault:
+    get:
+      operationId: redirectOrDefault
+      responses:
+        '301':
+          description: redirect
+          # response that does not provide any content
+        default:
+          description: default
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Bar'
   /fake:
     patch:
       tags:

samples/client/petstore/csharp/generichost/net4.7/FormModels/api/openapi.yaml

@@ -639,6 +639,18 @@ paths:
       summary: To test class name in snake case
       tags:
       - fake_classname_tags 123#$%^
+  /redirectOrDefault:
+    get:
+      operationId: redirectOrDefault
+      responses:
+        "301":
+          description: redirect
+        default:
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/Bar"
+          description: default
   /fake:
     delete:
       description: Fake endpoint to test group parameters (optional)

samples/client/petstore/csharp/generichost/net4.7/FormModels/docs/apis/DefaultApi.md

@@ -7,6 +7,7 @@ All URIs are relative to *http://petstore.swagger.io:80/v2*
 | [**FooGet**](DefaultApi.md#fooget) | **GET** /foo |  |
 | [**GetCountry**](DefaultApi.md#getcountry) | **POST** /country |  |
 | [**Hello**](DefaultApi.md#hello) | **GET** /hello | Hello |
+| [**RedirectOrDefault**](DefaultApi.md#redirectordefault) | **GET** /redirectOrDefault |  |
 | [**RolesReportGet**](DefaultApi.md#rolesreportget) | **GET** /roles/report |  |
 | [**Test**](DefaultApi.md#test) | **GET** /test | Retrieve an existing Notificationtest's Elements |
 
@@ -106,6 +107,37 @@ No authorization required
 
 [[Back to top]](#) [[Back to API list]](../../README.md#documentation-for-api-endpoints) [[Back to Model list]](../../README.md#documentation-for-models) [[Back to README]](../../README.md)
 
+<a id="redirectordefault"></a>
+# **RedirectOrDefault**
+> string RedirectOrDefault ()
+
+
+
+
+### Parameters
+This endpoint does not need any parameter.
+### Return type
+
+**string**
+
+### Authorization
+
+No authorization required
+
+### HTTP request headers
+
+ - **Content-Type**: Not defined
+ - **Accept**: application/json
+
+
+### HTTP response details
+| Status code | Description | Response headers |
+|-------------|-------------|------------------|
+| **301** | redirect |  -  |
+| **0** | default |  -  |
+
+[[Back to top]](#) [[Back to API list]](../../README.md#documentation-for-api-endpoints) [[Back to Model list]](../../README.md#documentation-for-models) [[Back to README]](../../README.md)
+
 <a id="rolesreportget"></a>
 # **RolesReportGet**
 > List&lt;List&lt;RolesReportsHash&gt;&gt; RolesReportGet ()

samples/client/petstore/csharp/generichost/net4.7/FormModels/src/Org.OpenAPITools.Test/Api/DefaultApiTests.cs

@@ -82,6 +82,15 @@ public async Task HelloAsyncTest()
             Assert.IsType<List<Guid>>(model);
         }
 
+        /// <summary>
+        /// Test RedirectOrDefault
+        /// </summary>
+        [Fact (Skip = "not implemented")]
+        public async Task RedirectOrDefaultAsyncTest()
+        {
+            await _instance.RedirectOrDefaultAsync();
+        }
+
         /// <summary>
         /// Test RolesReportGet
         /// </summary>
@@ -90,7 +99,7 @@ public async Task RolesReportGetAsyncTest()
         {
             var response = await _instance.RolesReportGetAsync();
             var model = response.Ok();
-            Assert.IsType<List<List<RolesReportsHash>>>(model);
+            Assert.IsType<List<List>>(model);
         }
 
         /// <summary>