[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/feign-gson/src/main/java/org/openapitools/client/api/FormApi.java

@@ -4,6 +4,7 @@ import org.openapitools.client.ApiClient;
 import org.openapitools.client.EncodingUtils;
 import org.openapitools.client.model.ApiResponse;
 
+import org.openapitools.client.model.TestFormObjectMultipartRequestMarker;
 
 import java.util.ArrayList;
 import java.util.HashMap;
@@ -48,6 +49,35 @@ public interface FormApi extends ApiClient.Api {
 
 
 
+  /**
+   * Test form parameter(s) for multipart schema
+   * Test form parameter(s) for multipart schema
+   * @param marker  (required)
+   * @return String
+   */
+  @RequestLine("POST /form/object/multipart")
+  @Headers({
+    "Content-Type: multipart/form-data",
+    "Accept: text/plain",
+  })
+  String testFormObjectMultipart(@Param("marker") TestFormObjectMultipartRequestMarker marker);
+
+  /**
+   * Test form parameter(s) for multipart schema
+   * Similar to <code>testFormObjectMultipart</code> but it also returns the http response headers .
+   * Test form parameter(s) for multipart schema
+   * @param marker  (required)
+   * @return A ApiResponse that wraps the response boyd and the http headers.
+   */
+  @RequestLine("POST /form/object/multipart")
+  @Headers({
+    "Content-Type: multipart/form-data",
+    "Accept: text/plain",
+  })
+  ApiResponse<String> testFormObjectMultipartWithHttpInfo(@Param("marker") TestFormObjectMultipartRequestMarker marker);
+
+
+
   /**
    * Test form parameter(s) for oneOf schema
    * Test form parameter(s) for oneOf schema

samples/client/echo_api/java/feign-gson/src/main/java/org/openapitools/client/model/TestFormObjectMultipartRequestMarker.java

@@ -0,0 +1,97 @@
+/*
+ * 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.google.gson.TypeAdapter;
+import com.google.gson.annotations.JsonAdapter;
+import com.google.gson.annotations.SerializedName;
+import com.google.gson.stream.JsonReader;
+import com.google.gson.stream.JsonWriter;
+import java.io.IOException;
+
+/**
+ * TestFormObjectMultipartRequestMarker
+ */
+@javax.annotation.Generated(value = "org.openapitools.codegen.languages.JavaClientCodegen", comments = "Generator version: 7.5.0-SNAPSHOT")
+public class TestFormObjectMultipartRequestMarker {
+  public static final String SERIALIZED_NAME_NAME = "name";
+  @SerializedName(SERIALIZED_NAME_NAME)
+  private String name;
+
+  public TestFormObjectMultipartRequestMarker() {
+  }
+
+  public TestFormObjectMultipartRequestMarker name(String name) {
+    
+    this.name = name;
+    return this;
+  }
+
+   /**
+   * Get name
+   * @return name
+  **/
+  @javax.annotation.Nullable
+
+  public String getName() {
+    return name;
+  }
+
+
+  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/feign-gson/src/test/java/org/openapitools/client/model/TestFormObjectMultipartRequestMarkerTest.java

@@ -0,0 +1,46 @@
+/*
+ * 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.google.gson.TypeAdapter;
+import com.google.gson.annotations.JsonAdapter;
+import com.google.gson.annotations.SerializedName;
+import com.google.gson.stream.JsonReader;
+import com.google.gson.stream.JsonWriter;
+import java.io.IOException;
+import org.junit.jupiter.api.Test;
+
+/**
+ * Model tests for TestFormObjectMultipartRequestMarker
+ */
+class TestFormObjectMultipartRequestMarkerTest {
+    private final TestFormObjectMultipartRequestMarker model = new TestFormObjectMultipartRequestMarker();
+
+    /**
+     * Model tests for TestFormObjectMultipartRequestMarker
+     */
+    @Test
+    void testTestFormObjectMultipartRequestMarker() {
+        // TODO: test TestFormObjectMultipartRequestMarker
+    }
+
+    /**
+     * Test the property 'name'
+     */
+    @Test
+    void nameTest() {
+        // TODO: test name
+    }
+
+}