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diff --git a/java/src/test/java/com/google/protobuf/LazyFieldTest.java b/java/src/test/java/com/google/protobuf/LazyFieldTest.java
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+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+package com.google.protobuf;
+
+import protobuf_unittest.UnittestProto.TestAllExtensions;
+import protobuf_unittest.UnittestProto.TestAllTypes;
+
+import java.io.IOException;
+import junit.framework.TestCase;
+
+/**
+ * Unit test for {@link LazyField}.
+ *
+ * @author xiangl@google.com (Xiang Li)
+ */
+public class LazyFieldTest extends TestCase {
+  public void testHashCode() {
+    MessageLite message = TestUtil.getAllSet();
+    LazyField lazyField =
+        createLazyFieldFromMessage(message);
+    assertEquals(message.hashCode(), lazyField.hashCode());
+    lazyField.getValue();
+    assertEquals(message.hashCode(), lazyField.hashCode());
+    changeValue(lazyField);
+    // make sure two messages have different hash code
+    assertNotEqual(message.hashCode(), lazyField.hashCode());
+  }
+
+  public void testHashCodeEx() throws Exception {
+    TestAllExtensions message = TestUtil.getAllExtensionsSet();
+    LazyField lazyField = createLazyFieldFromMessage(message);
+    assertEquals(message.hashCode(), lazyField.hashCode());
+    lazyField.getValue();
+    assertEquals(message.hashCode(), lazyField.hashCode());
+    changeValue(lazyField);
+    // make sure two messages have different hash code
+    assertNotEqual(message.hashCode(), lazyField.hashCode());
+  }
+
+  public void testGetValue() {
+    MessageLite message = TestUtil.getAllSet();
+    LazyField lazyField = createLazyFieldFromMessage(message);
+    assertEquals(message, lazyField.getValue());
+    changeValue(lazyField);
+    assertNotEqual(message, lazyField.getValue());
+  }
+
+  public void testGetValueEx() throws Exception {
+    TestAllExtensions message = TestUtil.getAllExtensionsSet();
+    LazyField lazyField = createLazyFieldFromMessage(message);
+    assertEquals(message, lazyField.getValue());
+    changeValue(lazyField);
+    assertNotEqual(message, lazyField.getValue());
+  }
+
+  public void testEqualsObject() {
+    MessageLite message = TestUtil.getAllSet();
+    LazyField lazyField = createLazyFieldFromMessage(message);
+    assertTrue(lazyField.equals(message));
+    changeValue(lazyField);
+    assertFalse(lazyField.equals(message));
+    assertFalse(message.equals(lazyField.getValue()));
+  }
+
+  public void testEqualsObjectEx() throws Exception {
+    TestAllExtensions message = TestUtil.getAllExtensionsSet();
+    LazyField lazyField = createLazyFieldFromMessage(message);
+    assertTrue(lazyField.equals(message));
+    changeValue(lazyField);
+    assertFalse(lazyField.equals(message));
+    assertFalse(message.equals(lazyField.getValue()));
+  }
+
+  // Help methods.
+
+  private LazyField createLazyFieldFromMessage(MessageLite message) {
+    ByteString bytes = message.toByteString();
+    return new LazyField(message.getDefaultInstanceForType(),
+        TestUtil.getExtensionRegistry(), bytes);
+  }
+
+  private void changeValue(LazyField lazyField) {
+    TestAllTypes.Builder builder = TestUtil.getAllSet().toBuilder();
+    builder.addRepeatedBool(true);
+    MessageLite newMessage = builder.build();
+    lazyField.setValue(newMessage);
+  }
+
+  private void assertNotEqual(Object unexpected, Object actual) {
+    assertFalse(unexpected == actual
+        || (unexpected != null && unexpected.equals(actual)));
+  }
+}