[java][native] Add tests for oneOf form parameters (#16487)

* add tests for oneOf form parameters

* update samples

samples/client/echo_api/java/apache-httpclient/README.md

@@ -113,6 +113,7 @@ Class | Method | HTTP request | Description
 *BodyApi* | [**testEchoBodyPetResponseString**](docs/BodyApi.md#testEchoBodyPetResponseString) | **POST** /echo/body/Pet/response_string | Test empty response body
 *BodyApi* | [**testEchoBodyTagResponseString**](docs/BodyApi.md#testEchoBodyTagResponseString) | **POST** /echo/body/Tag/response_string | Test empty json (request body)
 *FormApi* | [**testFormIntegerBooleanString**](docs/FormApi.md#testFormIntegerBooleanString) | **POST** /form/integer/boolean/string | Test form parameter(s)
+*FormApi* | [**testFormOneof**](docs/FormApi.md#testFormOneof) | **POST** /form/oneof | Test form parameter(s) for oneOf schema
 *HeaderApi* | [**testHeaderIntegerBooleanString**](docs/HeaderApi.md#testHeaderIntegerBooleanString) | **GET** /header/integer/boolean/string | Test header parameter(s)
 *PathApi* | [**testsPathStringPathStringIntegerPathInteger**](docs/PathApi.md#testsPathStringPathStringIntegerPathInteger) | **GET** /path/string/{path_string}/integer/{path_integer} | Test path parameter(s)
 *QueryApi* | [**testEnumRefString**](docs/QueryApi.md#testEnumRefString) | **GET** /query/enum_ref_string | Test query parameter(s)

samples/client/echo_api/java/apache-httpclient/api/openapi.yaml

@@ -62,6 +62,27 @@ paths:
       - form
       x-content-type: application/x-www-form-urlencoded
       x-accepts: text/plain
+  /form/oneof:
+    post:
+      description: Test form parameter(s) for oneOf schema
+      operationId: test/form/oneof
+      requestBody:
+        content:
+          application/x-www-form-urlencoded:
+            schema:
+              $ref: '#/components/schemas/test_form_oneof_request'
+      responses:
+        "200":
+          content:
+            text/plain:
+              schema:
+                type: string
+          description: Successful operation
+      summary: Test form parameter(s) for oneOf schema
+      tags:
+      - form
+      x-content-type: application/x-www-form-urlencoded
+      x-accepts: text/plain
   /header/integer/boolean/string:
     get:
       description: Test header parameter(s)
@@ -667,6 +688,26 @@ components:
         string_form:
           type: string
       type: object
+    test_form_oneof_request_oneOf:
+      properties:
+        form1:
+          type: string
+        form2:
+          type: integer
+      type: object
+    test_form_oneof_request_oneOf_1:
+      properties:
+        form3:
+          type: string
+        form4:
+          type: boolean
+      type: object
+    test_form_oneof_request:
+      oneOf:
+      - $ref: '#/components/schemas/test_form_oneof_request_oneOf'
+      - $ref: '#/components/schemas/test_form_oneof_request_oneOf_1'
+      - $ref: '#/components/schemas/Tag'
+      type: object
     test_query_style_form_explode_true_array_string_query_object_parameter:
       properties:
         values:

samples/client/echo_api/java/apache-httpclient/docs/FormApi.md

@@ -5,6 +5,7 @@ All URIs are relative to *http://localhost:3000*
 | Method | HTTP request | Description |
 |------------- | ------------- | -------------|
 | [**testFormIntegerBooleanString**](FormApi.md#testFormIntegerBooleanString) | **POST** /form/integer/boolean/string | Test form parameter(s) |
+| [**testFormOneof**](FormApi.md#testFormOneof) | **POST** /form/oneof | Test form parameter(s) for oneOf schema |
 
 
 
@@ -77,3 +78,79 @@ No authorization required
 |-------------|-------------|------------------|
 | **200** | Successful operation |  -  |
 
+
+## testFormOneof
+
+> String testFormOneof(form1, form2, form3, form4, id, name)
+
+Test form parameter(s) for oneOf schema
+
+Test form parameter(s) for oneOf schema
+
+### Example
+
+```java
+// Import classes:
+import org.openapitools.client.ApiClient;
+import org.openapitools.client.ApiException;
+import org.openapitools.client.Configuration;
+import org.openapitools.client.models.*;
+import org.openapitools.client.api.FormApi;
+
+public class Example {
+    public static void main(String[] args) {
+        ApiClient defaultClient = Configuration.getDefaultApiClient();
+        defaultClient.setBasePath("http://localhost:3000");
+
+        FormApi apiInstance = new FormApi(defaultClient);
+        String form1 = "form1_example"; // String | 
+        Integer form2 = 56; // Integer | 
+        String form3 = "form3_example"; // String | 
+        Boolean form4 = true; // Boolean | 
+        Long id = 56L; // Long | 
+        String name = "name_example"; // String | 
+        try {
+            String result = apiInstance.testFormOneof(form1, form2, form3, form4, id, name);
+            System.out.println(result);
+        } catch (ApiException e) {
+            System.err.println("Exception when calling FormApi#testFormOneof");
+            System.err.println("Status code: " + e.getCode());
+            System.err.println("Reason: " + e.getResponseBody());
+            System.err.println("Response headers: " + e.getResponseHeaders());
+            e.printStackTrace();
+        }
+    }
+}
+```
+
+### Parameters
+
+
+| Name | Type | Description  | Notes |
+|------------- | ------------- | ------------- | -------------|
+| **form1** | **String**|  | [optional] |
+| **form2** | **Integer**|  | [optional] |
+| **form3** | **String**|  | [optional] |
+| **form4** | **Boolean**|  | [optional] |
+| **id** | **Long**|  | [optional] |
+| **name** | **String**|  | [optional] |
+
+### Return type
+
+**String**
+
+### Authorization
+
+No authorization required
+
+### HTTP request headers
+
+- **Content-Type**: application/x-www-form-urlencoded
+- **Accept**: text/plain
+
+
+### HTTP response details
+| Status code | Description | Response headers |
+|-------------|-------------|------------------|
+| **200** | Successful operation |  -  |
+

samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/api/FormApi.java

@@ -129,4 +129,95 @@ if (stringForm != null)
     );
   }
 
+  /**
+   * Test form parameter(s) for oneOf schema
+   * Test form parameter(s) for oneOf schema
+   * @param form1  (optional)
+   * @param form2  (optional)
+   * @param form3  (optional)
+   * @param form4  (optional)
+   * @param id  (optional)
+   * @param name  (optional)
+   * @return String
+   * @throws ApiException if fails to make API call
+   */
+  public String testFormOneof(String form1, Integer form2, String form3, Boolean form4, Long id, String name) throws ApiException {
+    return this.testFormOneof(form1, form2, form3, form4, id, name, Collections.emptyMap());
+  }
+
+
+  /**
+   * Test form parameter(s) for oneOf schema
+   * Test form parameter(s) for oneOf schema
+   * @param form1  (optional)
+   * @param form2  (optional)
+   * @param form3  (optional)
+   * @param form4  (optional)
+   * @param id  (optional)
+   * @param name  (optional)
+   * @param additionalHeaders additionalHeaders for this call
+   * @return String
+   * @throws ApiException if fails to make API call
+   */
+  public String testFormOneof(String form1, Integer form2, String form3, Boolean form4, Long id, String name, Map<String, String> additionalHeaders) throws ApiException {
+    Object localVarPostBody = null;
+    
+    // create path and map variables
+    String localVarPath = "/form/oneof";
+
+    StringJoiner localVarQueryStringJoiner = new StringJoiner("&");
+    String localVarQueryParameterBaseName;
+    List<Pair> localVarQueryParams = new ArrayList<Pair>();
+    List<Pair> localVarCollectionQueryParams = new ArrayList<Pair>();
+    Map<String, String> localVarHeaderParams = new HashMap<String, String>();
+    Map<String, String> localVarCookieParams = new HashMap<String, String>();
+    Map<String, Object> localVarFormParams = new HashMap<String, Object>();
+
+    
+    localVarHeaderParams.putAll(additionalHeaders);
+
+    
+    if (form1 != null)
+      localVarFormParams.put("form1", form1);
+if (form2 != null)
+      localVarFormParams.put("form2", form2);
+if (form3 != null)
+      localVarFormParams.put("form3", form3);
+if (form4 != null)
+      localVarFormParams.put("form4", form4);
+if (id != null)
+      localVarFormParams.put("id", id);
+if (name != null)
+      localVarFormParams.put("name", name);
+
+    final String[] localVarAccepts = {
+      "text/plain"
+    };
+    final String localVarAccept = apiClient.selectHeaderAccept(localVarAccepts);
+
+    final String[] localVarContentTypes = {
+      "application/x-www-form-urlencoded"
+    };
+    final String localVarContentType = apiClient.selectHeaderContentType(localVarContentTypes);
+
+    String[] localVarAuthNames = new String[] {  };
+
+    TypeReference<String> localVarReturnType = new TypeReference<String>() {};
+    return apiClient.invokeAPI(
+        localVarPath,
+        "POST",
+        localVarQueryParams,
+        localVarCollectionQueryParams,
+        localVarQueryStringJoiner.toString(),
+        localVarPostBody,
+        localVarHeaderParams,
+        localVarCookieParams,
+        localVarFormParams,
+        localVarAccept,
+        localVarContentType,
+        localVarAuthNames,
+        localVarReturnType
+    );
+  }
+
 }