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diff --git a/extras/src/test/java/com/google/gson/graph/GraphAdapterBuilderTest.java b/extras/src/test/java/com/google/gson/graph/GraphAdapterBuilderTest.java
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+/*
+ * Copyright (C) 2011 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.graph;
+
+import com.google.gson.Gson;
+import com.google.gson.GsonBuilder;
+import com.google.gson.reflect.TypeToken;
+import java.lang.reflect.Type;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import junit.framework.TestCase;
+
+public final class GraphAdapterBuilderTest extends TestCase {
+  public void testSerialization() {
+    Roshambo rock = new Roshambo("ROCK");
+    Roshambo scissors = new Roshambo("SCISSORS");
+    Roshambo paper = new Roshambo("PAPER");
+    rock.beats = scissors;
+    scissors.beats = paper;
+    paper.beats = rock;
+
+    GsonBuilder gsonBuilder = new GsonBuilder();
+    new GraphAdapterBuilder()
+        .addType(Roshambo.class)
+        .registerOn(gsonBuilder);
+    Gson gson = gsonBuilder.create();
+
+    assertEquals("{'0x1':{'name':'ROCK','beats':'0x2'}," +
+        "'0x2':{'name':'SCISSORS','beats':'0x3'}," +
+        "'0x3':{'name':'PAPER','beats':'0x1'}}",
+        gson.toJson(rock).replace('"', '\''));
+  }
+
+  public void testDeserialization() {
+    String json = "{'0x1':{'name':'ROCK','beats':'0x2'}," +
+        "'0x2':{'name':'SCISSORS','beats':'0x3'}," +
+        "'0x3':{'name':'PAPER','beats':'0x1'}}";
+
+    GsonBuilder gsonBuilder = new GsonBuilder();
+    new GraphAdapterBuilder()
+        .addType(Roshambo.class)
+        .registerOn(gsonBuilder);
+    Gson gson = gsonBuilder.create();
+
+    Roshambo rock = gson.fromJson(json, Roshambo.class);
+    assertEquals("ROCK", rock.name);
+    Roshambo scissors = rock.beats;
+    assertEquals("SCISSORS", scissors.name);
+    Roshambo paper = scissors.beats;
+    assertEquals("PAPER", paper.name);
+    assertSame(rock, paper.beats);
+  }
+
+  public void testSerializationDirectSelfReference() {
+    Roshambo suicide = new Roshambo("SUICIDE");
+    suicide.beats = suicide;
+
+    GsonBuilder gsonBuilder = new GsonBuilder();
+    new GraphAdapterBuilder()
+        .addType(Roshambo.class)
+        .registerOn(gsonBuilder);
+    Gson gson = gsonBuilder.create();
+
+    assertEquals("{'0x1':{'name':'SUICIDE','beats':'0x1'}}",
+        gson.toJson(suicide).replace('"', '\''));
+  }
+
+  public void testDeserializationDirectSelfReference() {
+    String json = "{'0x1':{'name':'SUICIDE','beats':'0x1'}}";
+
+    GsonBuilder gsonBuilder = new GsonBuilder();
+    new GraphAdapterBuilder()
+        .addType(Roshambo.class)
+        .registerOn(gsonBuilder);
+    Gson gson = gsonBuilder.create();
+
+    Roshambo suicide = gson.fromJson(json, Roshambo.class);
+    assertEquals("SUICIDE", suicide.name);
+    assertSame(suicide, suicide.beats);
+  }
+
+  public void testSerializeListOfLists() {
+    Type listOfListsType = new TypeToken<List<List<?>>>() {}.getType();
+    Type listOfAnyType = new TypeToken<List<?>>() {}.getType();
+
+    List<List<?>> listOfLists = new ArrayList<List<?>>();
+    listOfLists.add(listOfLists);
+    listOfLists.add(new ArrayList<Object>());
+
+    GsonBuilder gsonBuilder = new GsonBuilder();
+    new GraphAdapterBuilder()
+        .addType(listOfListsType)
+        .addType(listOfAnyType)
+        .registerOn(gsonBuilder);
+    Gson gson = gsonBuilder.create();
+
+    String json = gson.toJson(listOfLists, listOfListsType);
+    assertEquals("{'0x1':['0x1','0x2'],'0x2':[]}", json.replace('"', '\''));
+  }
+
+  public void testDeserializeListOfLists() {
+    Type listOfAnyType = new TypeToken<List<?>>() {}.getType();
+    Type listOfListsType = new TypeToken<List<List<?>>>() {}.getType();
+
+    GsonBuilder gsonBuilder = new GsonBuilder();
+    new GraphAdapterBuilder()
+        .addType(listOfListsType)
+        .addType(listOfAnyType)
+        .registerOn(gsonBuilder);
+    Gson gson = gsonBuilder.create();
+
+    List<List<?>> listOfLists = gson.fromJson("{'0x1':['0x1','0x2'],'0x2':[]}", listOfListsType);
+    assertEquals(2, listOfLists.size());
+    assertSame(listOfLists, listOfLists.get(0));
+    assertEquals(Collections.emptyList(), listOfLists.get(1));
+  }
+
+  public void testSerializationWithMultipleTypes() {
+    Company google = new Company("Google");
+    new Employee("Jesse", google);
+    new Employee("Joel", google);
+
+    GsonBuilder gsonBuilder = new GsonBuilder();
+    new GraphAdapterBuilder()
+        .addType(Company.class)
+        .addType(Employee.class)
+        .registerOn(gsonBuilder);
+    Gson gson = gsonBuilder.create();
+
+    assertEquals("{'0x1':{'name':'Google','employees':['0x2','0x3']},"
+        + "'0x2':{'name':'Jesse','company':'0x1'},"
+        + "'0x3':{'name':'Joel','company':'0x1'}}",
+        gson.toJson(google).replace('"', '\''));
+  }
+
+  public void testDeserializationWithMultipleTypes() {
+    GsonBuilder gsonBuilder = new GsonBuilder();
+    new GraphAdapterBuilder()
+        .addType(Company.class)
+        .addType(Employee.class)
+        .registerOn(gsonBuilder);
+    Gson gson = gsonBuilder.create();
+
+    String json = "{'0x1':{'name':'Google','employees':['0x2','0x3']},"
+        + "'0x2':{'name':'Jesse','company':'0x1'},"
+        + "'0x3':{'name':'Joel','company':'0x1'}}";
+    Company company = gson.fromJson(json, Company.class);
+    assertEquals("Google", company.name);
+    Employee jesse = company.employees.get(0);
+    assertEquals("Jesse", jesse.name);
+    assertEquals(company, jesse.company);
+    Employee joel = company.employees.get(1);
+    assertEquals("Joel", joel.name);
+    assertEquals(company, joel.company);
+  }
+
+  static class Roshambo {
+    String name;
+    Roshambo beats;
+    Roshambo(String name) {
+      this.name = name;
+    }
+  }
+
+  static class Employee {
+    final String name;
+    final Company company;
+    Employee(String name, Company company) {
+      this.name = name;
+      this.company = company;
+      this.company.employees.add(this);
+    }
+  }
+
+  static class Company {
+    final String name;
+    final List<Employee> employees = new ArrayList<Employee>();
+    Company(String name) {
+      this.name = name;
+    }
+  }
+}