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Java example source code file (JsonObjectTest.java)

This example Java source code file (JsonObjectTest.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

exception, hello, jsonarray, jsonelement, jsonobject, jsonobjecttest, jsonprimitive, nullpointerexception, should, string, testcase

The JsonObjectTest.java Java example source code

/*
 * 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;

import com.google.gson.common.MoreAsserts;

import junit.framework.TestCase;

/**
 * Unit test for the {@link JsonObject} class.
 *
 * @author Joel Leitch
 */
public class JsonObjectTest extends TestCase {

  public void testAddingAndRemovingObjectProperties() throws Exception {
    JsonObject jsonObj = new JsonObject();
    String propertyName = "property";
    assertFalse(jsonObj.has(propertyName));
    assertNull(jsonObj.get(propertyName));

    JsonPrimitive value = new JsonPrimitive("blah");
    jsonObj.add(propertyName, value);
    assertEquals(value, jsonObj.get(propertyName));

    JsonElement removedElement = jsonObj.remove(propertyName);
    assertEquals(value, removedElement);
    assertFalse(jsonObj.has(propertyName));
    assertNull(jsonObj.get(propertyName));
  }

  public void testAddingNullPropertyValue() throws Exception {
    String propertyName = "property";
    JsonObject jsonObj = new JsonObject();
    jsonObj.add(propertyName, null);

    assertTrue(jsonObj.has(propertyName));

    JsonElement jsonElement = jsonObj.get(propertyName);
    assertNotNull(jsonElement);
    assertTrue(jsonElement.isJsonNull());
  }

  public void testAddingNullOrEmptyPropertyName() throws Exception {
    JsonObject jsonObj = new JsonObject();
    try {
      jsonObj.add(null, JsonNull.INSTANCE);
      fail("Should not allow null property names.");
    } catch (NullPointerException expected) { }

    jsonObj.add("", JsonNull.INSTANCE);
    jsonObj.add("   \t", JsonNull.INSTANCE);
  }

  public void testAddingBooleanProperties() throws Exception {
    String propertyName = "property";
    JsonObject jsonObj = new JsonObject();
    jsonObj.addProperty(propertyName, true);

    assertTrue(jsonObj.has(propertyName));

    JsonElement jsonElement = jsonObj.get(propertyName);
    assertNotNull(jsonElement);
    assertTrue(jsonElement.getAsBoolean());
  }

  public void testAddingStringProperties() throws Exception {
    String propertyName = "property";
    String value = "blah";

    JsonObject jsonObj = new JsonObject();
    jsonObj.addProperty(propertyName, value);

    assertTrue(jsonObj.has(propertyName));

    JsonElement jsonElement = jsonObj.get(propertyName);
    assertNotNull(jsonElement);
    assertEquals(value, jsonElement.getAsString());
  }

  public void testAddingCharacterProperties() throws Exception {
    String propertyName = "property";
    char value = 'a';

    JsonObject jsonObj = new JsonObject();
    jsonObj.addProperty(propertyName, value);

    assertTrue(jsonObj.has(propertyName));

    JsonElement jsonElement = jsonObj.get(propertyName);
    assertNotNull(jsonElement);
    assertEquals(String.valueOf(value), jsonElement.getAsString());
    assertEquals(value, jsonElement.getAsCharacter());
  }

  /**
   * From bug report http://code.google.com/p/google-gson/issues/detail?id=182
   */
  public void testPropertyWithQuotes() {
    JsonObject jsonObj = new JsonObject();
    jsonObj.add("a\"b", new JsonPrimitive("c\"d"));
    String json = new Gson().toJson(jsonObj);
    assertEquals("{\"a\\\"b\":\"c\\\"d\"}", json);
  }

  /**
   * From issue 227.
   */
  public void testWritePropertyWithEmptyStringName() {
    JsonObject jsonObj = new JsonObject();
    jsonObj.add("", new JsonPrimitive(true));
    assertEquals("{\"\":true}", new Gson().toJson(jsonObj));

  }

  public void testReadPropertyWithEmptyStringName() {
    JsonObject jsonObj = new JsonParser().parse("{\"\":true}").getAsJsonObject();
    assertEquals(true, jsonObj.get("").getAsBoolean());
  }

  public void testEqualsOnEmptyObject() {
    MoreAsserts.assertEqualsAndHashCode(new JsonObject(), new JsonObject());
  }

  public void testEqualsNonEmptyObject() {
    JsonObject a = new JsonObject();
    JsonObject b = new JsonObject();

    assertEquals(a, a);

    a.add("foo", new JsonObject());
    assertFalse(a.equals(b));
    assertFalse(b.equals(a));

    b.add("foo", new JsonObject());
    MoreAsserts.assertEqualsAndHashCode(a, b);

    a.add("bar", new JsonObject());
    assertFalse(a.equals(b));
    assertFalse(b.equals(a));

    b.add("bar", JsonNull.INSTANCE);
    assertFalse(a.equals(b));
    assertFalse(b.equals(a));
  }

  public void testSize() {
    JsonObject o = new JsonObject();
    assertEquals(0, o.size());

    o.add("Hello", new JsonPrimitive(1));
    assertEquals(1, o.size());

    o.add("Hi", new JsonPrimitive(1));
    assertEquals(2, o.size());

    o.remove("Hello");
    assertEquals(1, o.size());
  }

  public void testDeepCopy() {
    JsonObject original = new JsonObject();
    JsonArray firstEntry = new JsonArray();
    original.add("key", firstEntry);

    JsonObject copy = original.deepCopy();
    firstEntry.add(new JsonPrimitive("z"));

    assertEquals(1, original.get("key").getAsJsonArray().size());
    assertEquals(0, copy.get("key").getAsJsonArray().size());
  }
}

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