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diff --git a/gson/src/test/java/com/google/gson/functional/MoreSpecificTypeSerializationTest.java b/gson/src/test/java/com/google/gson/functional/MoreSpecificTypeSerializationTest.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.functional;
+
+import com.google.gson.Gson;
+import com.google.gson.JsonObject;
+
+import junit.framework.TestCase;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * Tests for Gson serialization of a sub-class object while encountering a base-class type
+ *
+ * @author Inderjeet Singh
+ */
+@SuppressWarnings("unused")
+public class MoreSpecificTypeSerializationTest extends TestCase {
+  private Gson gson;
+
+  @Override
+  protected void setUp() throws Exception {
+    super.setUp();
+    gson = new Gson();
+  }
+
+  public void testSubclassFields() {
+    ClassWithBaseFields target = new ClassWithBaseFields(new Sub(1, 2));
+    String json = gson.toJson(target);
+    assertTrue(json.contains("\"b\":1"));
+    assertTrue(json.contains("\"s\":2"));
+  }
+
+  public void testListOfSubclassFields() {
+    Collection<Base> list = new ArrayList<Base>();
+    list.add(new Base(1));
+    list.add(new Sub(2, 3));
+    ClassWithContainersOfBaseFields target = new ClassWithContainersOfBaseFields(list, null);
+    String json = gson.toJson(target);
+    assertTrue(json, json.contains("{\"b\":1}"));
+    assertTrue(json, json.contains("{\"s\":3,\"b\":2}"));
+  }
+
+  public void testMapOfSubclassFields() {
+    Map<String, Base> map = new HashMap<String, Base>();
+    map.put("base", new Base(1));
+    map.put("sub", new Sub(2, 3));
+    ClassWithContainersOfBaseFields target = new ClassWithContainersOfBaseFields(null, map);
+    JsonObject json = gson.toJsonTree(target).getAsJsonObject().get("map").getAsJsonObject();
+    assertEquals(1, json.get("base").getAsJsonObject().get("b").getAsInt());
+    JsonObject sub = json.get("sub").getAsJsonObject();
+    assertEquals(2, sub.get("b").getAsInt());
+    assertEquals(3, sub.get("s").getAsInt());
+  }
+
+  /**
+   * For parameterized type, Gson ignores the more-specific type and sticks to the declared type
+   */
+  public void testParameterizedSubclassFields() {
+    ClassWithParameterizedBaseFields target = new ClassWithParameterizedBaseFields(
+        new ParameterizedSub<String>("one", "two"));
+    String json = gson.toJson(target);
+    assertTrue(json.contains("\"t\":\"one\""));
+    assertFalse(json.contains("\"s\""));
+  }
+
+  /**
+   * For parameterized type in a List, Gson ignores the more-specific type and sticks to
+   * the declared type
+   */
+  public void testListOfParameterizedSubclassFields() {
+    Collection<ParameterizedBase<String>> list = new ArrayList<ParameterizedBase<String>>();
+    list.add(new ParameterizedBase<String>("one"));
+    list.add(new ParameterizedSub<String>("two", "three"));
+    ClassWithContainersOfParameterizedBaseFields target =
+      new ClassWithContainersOfParameterizedBaseFields(list, null);
+    String json = gson.toJson(target);
+    assertTrue(json, json.contains("{\"t\":\"one\"}"));
+    assertFalse(json, json.contains("\"s\":"));
+  }
+
+  /**
+   * For parameterized type in a map, Gson ignores the more-specific type and sticks to the
+   * declared type
+   */
+  public void testMapOfParameterizedSubclassFields() {
+    Map<String, ParameterizedBase<String>> map = new HashMap<String, ParameterizedBase<String>>();
+    map.put("base", new ParameterizedBase<String>("one"));
+    map.put("sub", new ParameterizedSub<String>("two", "three"));
+    ClassWithContainersOfParameterizedBaseFields target =
+      new ClassWithContainersOfParameterizedBaseFields(null, map);
+    JsonObject json = gson.toJsonTree(target).getAsJsonObject().get("map").getAsJsonObject();
+    assertEquals("one", json.get("base").getAsJsonObject().get("t").getAsString());
+    JsonObject sub = json.get("sub").getAsJsonObject();
+    assertEquals("two", sub.get("t").getAsString());
+    assertNull(sub.get("s"));
+  }
+
+  private static class Base {
+    int b;
+    Base(int b) {
+      this.b = b;
+    }
+  }
+
+  private static class Sub extends Base {
+    int s;
+    Sub(int b, int s) {
+      super(b);
+      this.s = s;
+    }
+  }
+
+  private static class ClassWithBaseFields {
+    Base b;
+    ClassWithBaseFields(Base b) {
+      this.b = b;
+    }
+  }
+
+  private static class ClassWithContainersOfBaseFields {
+    Collection<Base> collection;
+    Map<String, Base> map;
+    ClassWithContainersOfBaseFields(Collection<Base> collection, Map<String, Base> map) {
+      this.collection = collection;
+      this.map = map;
+    }
+  }
+
+  private static class ParameterizedBase<T> {
+    T t;
+    ParameterizedBase(T t) {
+      this.t = t;
+    }
+  }
+
+  private static class ParameterizedSub<T> extends ParameterizedBase<T> {
+    T s;
+    ParameterizedSub(T t, T s) {
+      super(t);
+      this.s = s;
+    }
+  }
+
+  private static class ClassWithParameterizedBaseFields {
+    ParameterizedBase<String> b;
+    ClassWithParameterizedBaseFields(ParameterizedBase<String> b) {
+      this.b = b;
+    }
+  }
+
+  private static class ClassWithContainersOfParameterizedBaseFields {
+    Collection<ParameterizedBase<String>> collection;
+    Map<String, ParameterizedBase<String>> map;
+    ClassWithContainersOfParameterizedBaseFields(Collection<ParameterizedBase<String>> collection,
+        Map<String, ParameterizedBase<String>> map) {
+      this.collection = collection;
+      this.map = map;
+    }
+  }
+}