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diff --git a/gson/src/test/java/com/google/gson/JsonObjectTest.java b/gson/src/test/java/com/google/gson/JsonObjectTest.java
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+++ b/gson/src/test/java/com/google/gson/JsonObjectTest.java
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+/*
+ * 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 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());
+  }
+}