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diff --git a/gson/src/test/java/com/google/gson/functional/DelegateTypeAdapterTest.java b/gson/src/test/java/com/google/gson/functional/DelegateTypeAdapterTest.java
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+/*
+ * Copyright (C) 2012 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 java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+
+import junit.framework.TestCase;
+
+import com.google.gson.Gson;
+import com.google.gson.GsonBuilder;
+import com.google.gson.TypeAdapter;
+import com.google.gson.TypeAdapterFactory;
+import com.google.gson.common.TestTypes.BagOfPrimitives;
+import com.google.gson.reflect.TypeToken;
+import com.google.gson.stream.JsonReader;
+import com.google.gson.stream.JsonWriter;
+
+/**
+ * Functional tests for {@link Gson#getDelegateAdapter(TypeAdapterFactory, TypeToken)} method.
+ *
+ * @author Inderjeet Singh
+ */
+public class DelegateTypeAdapterTest extends TestCase {
+
+  private StatsTypeAdapterFactory stats;
+  private Gson gson;
+  protected void setUp() throws Exception {
+    super.setUp();
+    stats = new StatsTypeAdapterFactory();
+    gson = new GsonBuilder()
+      .registerTypeAdapterFactory(stats)
+      .create();
+  }
+
+  public void testDelegateInvoked() {
+    List<BagOfPrimitives> bags = new ArrayList<BagOfPrimitives>();
+    for (int i = 0; i < 10; ++i) {
+      bags.add(new BagOfPrimitives(i, i, i % 2 == 0, String.valueOf(i)));
+    }
+    String json = gson.toJson(bags);
+    bags = gson.fromJson(json, new TypeToken<List<BagOfPrimitives>>(){}.getType());
+    // 11: 1 list object, and 10 entries. stats invoked on all 5 fields
+    assertEquals(51, stats.numReads);
+    assertEquals(51, stats.numWrites);
+  }
+
+  public void testDelegateInvokedOnStrings() {
+    String[] bags = {"1", "2", "3", "4"};
+    String json = gson.toJson(bags);
+    bags = gson.fromJson(json, String[].class);
+    // 1 array object with 4 elements.
+    assertEquals(5, stats.numReads);
+    assertEquals(5, stats.numWrites);
+  }
+
+  private static class StatsTypeAdapterFactory implements TypeAdapterFactory {
+    public int numReads = 0;
+    public int numWrites = 0;
+
+    public <T> TypeAdapter<T> create(Gson gson, TypeToken<T> type) {
+      final TypeAdapter<T> delegate = gson.getDelegateAdapter(this, type);
+      return new TypeAdapter<T>() {
+        @Override
+        public void write(JsonWriter out, T value) throws IOException {
+          ++numWrites;
+          delegate.write(out, value);
+        }
+
+        @Override
+        public T read(JsonReader in) throws IOException {
+          ++numReads;
+          return delegate.read(in);
+        }
+      };
+    }
+  }
+}