[Python] Add echo_api test object serialization for multipart requests (#18176)

* [python] echo add test object serialization for multipart requests

* [echo api] update samples

* [echo api] update samples

samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/api/FormApi.java

@@ -3,6 +3,7 @@ package org.openapitools.client.api;
 import org.openapitools.client.ApiClient;
 import org.openapitools.client.BaseApi;
 
+import org.openapitools.client.model.TestFormObjectMultipartRequestMarker;
 
 import java.util.Collections;
 import java.util.HashMap;
@@ -90,6 +91,57 @@ public class FormApi extends BaseApi {
         ParameterizedTypeReference<String> localReturnType = new ParameterizedTypeReference<String>() {};
         return apiClient.invokeAPI("/form/integer/boolean/string", HttpMethod.POST, Collections.<String, Object>emptyMap(), localVarQueryParams, localVarPostBody, localVarHeaderParams, localVarCookieParams, localVarFormParams, localVarAccept, localVarContentType, localVarAuthNames, localReturnType);
     }
+    /**
+     * Test form parameter(s) for multipart schema
+     * Test form parameter(s) for multipart schema
+     * <p><b>200</b> - Successful operation
+     * @param marker  (required)
+     * @return String
+     * @throws RestClientException if an error occurs while attempting to invoke the API
+     */
+    public String testFormObjectMultipart(TestFormObjectMultipartRequestMarker marker) throws RestClientException {
+        return testFormObjectMultipartWithHttpInfo(marker).getBody();
+    }
+
+    /**
+     * Test form parameter(s) for multipart schema
+     * Test form parameter(s) for multipart schema
+     * <p><b>200</b> - Successful operation
+     * @param marker  (required)
+     * @return ResponseEntity&lt;String&gt;
+     * @throws RestClientException if an error occurs while attempting to invoke the API
+     */
+    public ResponseEntity<String> testFormObjectMultipartWithHttpInfo(TestFormObjectMultipartRequestMarker marker) throws RestClientException {
+        Object localVarPostBody = null;
+        
+        // verify the required parameter 'marker' is set
+        if (marker == null) {
+            throw new HttpClientErrorException(HttpStatus.BAD_REQUEST, "Missing the required parameter 'marker' when calling testFormObjectMultipart");
+        }
+        
+
+        final MultiValueMap<String, String> localVarQueryParams = new LinkedMultiValueMap<String, String>();
+        final HttpHeaders localVarHeaderParams = new HttpHeaders();
+        final MultiValueMap<String, String> localVarCookieParams = new LinkedMultiValueMap<String, String>();
+        final MultiValueMap<String, Object> localVarFormParams = new LinkedMultiValueMap<String, Object>();
+
+        if (marker != null)
+            localVarFormParams.add("marker", marker);
+
+        final String[] localVarAccepts = { 
+            "text/plain"
+         };
+        final List<MediaType> localVarAccept = apiClient.selectHeaderAccept(localVarAccepts);
+        final String[] localVarContentTypes = { 
+            "multipart/form-data"
+         };
+        final MediaType localVarContentType = apiClient.selectHeaderContentType(localVarContentTypes);
+
+        String[] localVarAuthNames = new String[] {  };
+
+        ParameterizedTypeReference<String> localReturnType = new ParameterizedTypeReference<String>() {};
+        return apiClient.invokeAPI("/form/object/multipart", HttpMethod.POST, Collections.<String, Object>emptyMap(), localVarQueryParams, localVarPostBody, localVarHeaderParams, localVarCookieParams, localVarFormParams, localVarAccept, localVarContentType, localVarAuthNames, localReturnType);
+    }
     /**
      * Test form parameter(s) for oneOf schema
      * Test form parameter(s) for oneOf schema

samples/client/echo_api/java/resttemplate/src/main/java/org/openapitools/client/model/TestFormObjectMultipartRequestMarker.java

@@ -0,0 +1,104 @@
+/*
+ * Echo Server API
+ * Echo Server API
+ *
+ * The version of the OpenAPI document: 0.1.0
+ * Contact: team@openapitools.org
+ *
+ * NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
+ * https://openapi-generator.tech
+ * Do not edit the class manually.
+ */
+
+
+package org.openapitools.client.model;
+
+import java.util.Objects;
+import java.util.Arrays;
+import com.fasterxml.jackson.annotation.JsonInclude;
+import com.fasterxml.jackson.annotation.JsonProperty;
+import com.fasterxml.jackson.annotation.JsonCreator;
+import com.fasterxml.jackson.annotation.JsonTypeName;
+import com.fasterxml.jackson.annotation.JsonValue;
+import com.fasterxml.jackson.annotation.JsonPropertyOrder;
+import com.fasterxml.jackson.annotation.JsonTypeName;
+
+/**
+ * TestFormObjectMultipartRequestMarker
+ */
+@JsonPropertyOrder({
+  TestFormObjectMultipartRequestMarker.JSON_PROPERTY_NAME
+})
+@JsonTypeName("test_form_object_multipart_request_marker")
+@javax.annotation.Generated(value = "org.openapitools.codegen.languages.JavaClientCodegen", comments = "Generator version: 7.5.0-SNAPSHOT")
+public class TestFormObjectMultipartRequestMarker {
+  public static final String JSON_PROPERTY_NAME = "name";
+  private String name;
+
+  public TestFormObjectMultipartRequestMarker() {
+  }
+
+  public TestFormObjectMultipartRequestMarker name(String name) {
+    
+    this.name = name;
+    return this;
+  }
+
+   /**
+   * Get name
+   * @return name
+  **/
+  @javax.annotation.Nullable
+  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
+
+  public String getName() {
+    return name;
+  }
+
+
+  @JsonProperty(JSON_PROPERTY_NAME)
+  @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
+  public void setName(String name) {
+    this.name = name;
+  }
+
+  @Override
+  public boolean equals(Object o) {
+    if (this == o) {
+      return true;
+    }
+    if (o == null || getClass() != o.getClass()) {
+      return false;
+    }
+    TestFormObjectMultipartRequestMarker testFormObjectMultipartRequestMarker = (TestFormObjectMultipartRequestMarker) o;
+    return Objects.equals(this.name, testFormObjectMultipartRequestMarker.name);
+  }
+
+  @Override
+  public int hashCode() {
+    return Objects.hash(name);
+  }
+
+  @Override
+  public String toString() {
+    StringBuilder sb = new StringBuilder();
+    sb.append("class TestFormObjectMultipartRequestMarker {\n");
+    sb.append("    name: ").append(toIndentedString(name)).append("\n");
+    sb.append("}");
+    return sb.toString();
+  }
+
+  /**
+   * Convert the given object to string with each line indented by 4 spaces
+   * (except the first line).
+   */
+  private String toIndentedString(Object o) {
+    if (o == null) {
+      return "null";
+    }
+    return o.toString().replace("\n", "\n    ");
+  }
+
+}
+

samples/client/echo_api/java/resttemplate/src/test/java/org/openapitools/client/model/TestFormObjectMultipartRequestMarkerTest.java

@@ -0,0 +1,47 @@
+/*
+ * Echo Server API
+ * Echo Server API
+ *
+ * The version of the OpenAPI document: 0.1.0
+ * Contact: team@openapitools.org
+ *
+ * NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
+ * https://openapi-generator.tech
+ * Do not edit the class manually.
+ */
+
+
+package org.openapitools.client.model;
+
+import com.fasterxml.jackson.annotation.JsonInclude;
+import com.fasterxml.jackson.annotation.JsonProperty;
+import com.fasterxml.jackson.annotation.JsonCreator;
+import com.fasterxml.jackson.annotation.JsonTypeName;
+import com.fasterxml.jackson.annotation.JsonValue;
+import org.junit.Assert;
+import org.junit.Ignore;
+import org.junit.Test;
+
+/**
+ * Model tests for TestFormObjectMultipartRequestMarker
+ */
+public class TestFormObjectMultipartRequestMarkerTest {
+    private final TestFormObjectMultipartRequestMarker model = new TestFormObjectMultipartRequestMarker();
+
+    /**
+     * Model tests for TestFormObjectMultipartRequestMarker
+     */
+    @Test
+    public void testTestFormObjectMultipartRequestMarker() {
+        // TODO: test TestFormObjectMultipartRequestMarker
+    }
+
+    /**
+     * Test the property 'name'
+     */
+    @Test
+    public void nameTest() {
+        // TODO: test name
+    }
+
+}