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diff --git a/java/src/test/java/com/google/protobuf/LiteTest.java b/java/src/test/java/com/google/protobuf/LiteTest.java
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+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// http://code.google.com/p/protobuf/
+//
+// 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 com.google.protobuf.UnittestLite;
+import com.google.protobuf.UnittestLite.TestAllTypesLite;
+import com.google.protobuf.UnittestLite.TestAllExtensionsLite;
+import com.google.protobuf.UnittestLite.TestNestedExtensionLite;
+
+import junit.framework.TestCase;
+
+/**
+ * Test lite runtime.
+ *
+ * @author kenton@google.com Kenton Varda
+ */
+public class LiteTest extends TestCase {
+  public void setUp() throws Exception {
+    // Test that nested extensions are initialized correctly even if the outer
+    // class has not been accessed directly.  This was once a bug with lite
+    // messages.
+    //
+    // We put this in setUp() rather than in its own test method because we
+    // need to make sure it runs before any actual tests.
+    assertTrue(TestNestedExtensionLite.nestedExtension != null);
+  }
+
+  public void testLite() throws Exception {
+    // Since lite messages are a subset of regular messages, we can mostly
+    // assume that the functionality of lite messages is already thoroughly
+    // tested by the regular tests.  All this test really verifies is that
+    // a proto with optimize_for = LITE_RUNTIME compiles correctly when
+    // linked only against the lite library.  That is all tested at compile
+    // time, leaving not much to do in this method.  Let's just do some random
+    // stuff to make sure the lite message is actually here and usable.
+
+    TestAllTypesLite message =
+      TestAllTypesLite.newBuilder()
+                      .setOptionalInt32(123)
+                      .addRepeatedString("hello")
+                      .setOptionalNestedMessage(
+                          TestAllTypesLite.NestedMessage.newBuilder().setBb(7))
+                      .build();
+
+    ByteString data = message.toByteString();
+
+    TestAllTypesLite message2 = TestAllTypesLite.parseFrom(data);
+
+    assertEquals(123, message2.getOptionalInt32());
+    assertEquals(1, message2.getRepeatedStringCount());
+    assertEquals("hello", message2.getRepeatedString(0));
+    assertEquals(7, message2.getOptionalNestedMessage().getBb());
+  }
+
+  public void testLiteExtensions() throws Exception {
+    // TODO(kenton):  Unlike other features of the lite library, extensions are
+    //   implemented completely differently from the regular library.  We
+    //   need to test them more thoroughly, once they are fully-implemented.
+
+    TestAllExtensionsLite message =
+      TestAllExtensionsLite.newBuilder()
+        .setExtension(UnittestLite.optionalInt32ExtensionLite, 123)
+        .addExtension(UnittestLite.repeatedStringExtensionLite, "hello")
+        .setExtension(UnittestLite.optionalNestedEnumExtensionLite,
+            TestAllTypesLite.NestedEnum.BAZ)
+        .setExtension(UnittestLite.optionalNestedMessageExtensionLite,
+            TestAllTypesLite.NestedMessage.newBuilder().setBb(7).build())
+        .build();
+
+    // Test copying a message, since coping extensions actually does use a
+    // different code path between lite and regular libraries, and as of this
+    // writing, parsing hasn't been implemented yet.
+    TestAllExtensionsLite message2 = message.toBuilder().build();
+
+    assertEquals(123, (int) message2.getExtension(
+        UnittestLite.optionalInt32ExtensionLite));
+    assertEquals(1, message2.getExtensionCount(
+        UnittestLite.repeatedStringExtensionLite));
+    assertEquals("hello", message2.getExtension(
+        UnittestLite.repeatedStringExtensionLite, 0));
+    assertEquals(TestAllTypesLite.NestedEnum.BAZ, message2.getExtension(
+        UnittestLite.optionalNestedEnumExtensionLite));
+    assertEquals(7, message2.getExtension(
+        UnittestLite.optionalNestedMessageExtensionLite).getBb());
+  }
+}