gson-comments/gson/src/test/java/com/google/gson/functional/NamingPolicyTest.java

/*
 * Copyright (C) 2008 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.google.gson.functional;

import com.google.gson.FieldNamingPolicy;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.annotations.SerializedName;
import com.google.gson.common.TestTypes.ClassWithSerializedNameFields;
import com.google.gson.common.TestTypes.StringWrapper;

import junit.framework.TestCase;

/**
 * Functional tests for naming policies.
 *
 * @author Inderjeet Singh
 * @author Joel Leitch
 */
public class NamingPolicyTest extends TestCase {

  private GsonBuilder builder;

  @Override
  protected void setUp() throws Exception {
    super.setUp();
    builder = new GsonBuilder();
  }

  public void testGsonWithNonDefaultFieldNamingPolicySerialization() {
    Gson gson = builder.setFieldNamingPolicy(FieldNamingPolicy.UPPER_CAMEL_CASE).create();
    StringWrapper target = new StringWrapper("blah");
    assertEquals("{\"SomeConstantStringInstanceField\":\""
        + target.someConstantStringInstanceField + "\"}", gson.toJson(target));
  }

  public void testGsonWithNonDefaultFieldNamingPolicyDeserialiation() {
    Gson gson = builder.setFieldNamingPolicy(FieldNamingPolicy.UPPER_CAMEL_CASE).create();
    StringWrapper target = new StringWrapper("SomeValue");
    String jsonRepresentation = gson.toJson(target);
    StringWrapper deserializedObject = gson.fromJson(jsonRepresentation, StringWrapper.class);
    assertEquals(target.someConstantStringInstanceField,
        deserializedObject.someConstantStringInstanceField);
  }

  public void testGsonWithSerializedNameFieldNamingPolicySerialization() {
    Gson gson = builder.create();
    ClassWithSerializedNameFields expected = new ClassWithSerializedNameFields(5);
    String actual = gson.toJson(expected);
    assertEquals(expected.getExpectedJson(), actual);
  }

  public void testGsonWithSerializedNameFieldNamingPolicyDeserialization() {
    Gson gson = builder.create();
    ClassWithSerializedNameFields expected = new ClassWithSerializedNameFields(5);
    ClassWithSerializedNameFields actual =
        gson.fromJson(expected.getExpectedJson(), ClassWithSerializedNameFields.class);
    assertEquals(expected.f, actual.f);
  }
  
  public void testGsonDuplicateNameUsingSerializedNameFieldNamingPolicySerialization() {
    Gson gson = builder.create();
    ClassWithDuplicateFields target = new ClassWithDuplicateFields(10);
    String actual = gson.toJson(target);
    assertEquals("{\"a\":10}", actual);
    
    target = new ClassWithDuplicateFields(3.0D);
    actual = gson.toJson(target);
    assertEquals("{\"a\":3.0}", actual);
  }
  
  @SuppressWarnings("unused")
  private static class ClassWithDuplicateFields {
    public Integer a;
    @SerializedName("a") public Double b;
    
    public ClassWithDuplicateFields(Integer a) {
      this(a, null);
    }
    
    public ClassWithDuplicateFields(Double b) {
      this(null, b);
    }
    
    public ClassWithDuplicateFields(Integer a, Double b) {
      this.a = a;
      this.b = b;
    }
  }
}