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diff --git a/csharp/src/ProtocolBuffersLite.Test/LiteTest.cs b/csharp/src/ProtocolBuffersLite.Test/LiteTest.cs
new file mode 100644
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+++ b/csharp/src/ProtocolBuffersLite.Test/LiteTest.cs
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+#region Copyright notice and license
+
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// http://github.com/jskeet/dotnet-protobufs/
+// Original C++/Java/Python code:
+// 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.
+
+#endregion
+
+using Google.ProtocolBuffers.TestProtos;
+using NUnit.Framework;
+
+namespace Google.ProtocolBuffers
+{
+    /// <summary>
+    /// Miscellaneous tests for message operations that apply to both
+    /// generated and dynamic messages.
+    /// </summary>
+    public class LiteTest
+    {
+        [Test]
+        public void TestLite()
+        {
+            // 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.CreateBuilder()
+                    .SetOptionalInt32(123)
+                    .AddRepeatedString("hello")
+                    .SetOptionalNestedMessage(
+                        TestAllTypesLite.Types.NestedMessage.CreateBuilder().SetBb(7))
+                    .Build();
+
+            ByteString data = message.ToByteString();
+
+            TestAllTypesLite message2 = TestAllTypesLite.ParseFrom(data);
+
+            Assert.AreEqual(123, message2.OptionalInt32);
+            Assert.AreEqual(1, message2.RepeatedStringCount);
+            Assert.AreEqual("hello", message2.RepeatedStringList[0]);
+            Assert.AreEqual(7, message2.OptionalNestedMessage.Bb);
+        }
+
+        [Test]
+        public void TestLiteExtensions()
+        {
+            // TODO(kenton):  Unlike other features of the lite library, extensions are
+            //   implemented completely differently from the regular library.  We
+            //   should probably test them more thoroughly.
+
+            TestAllExtensionsLite message =
+                TestAllExtensionsLite.CreateBuilder()
+                    .SetExtension(UnittestLite.OptionalInt32ExtensionLite, 123)
+                    .AddExtension(UnittestLite.RepeatedStringExtensionLite, "hello")
+                    .SetExtension(UnittestLite.OptionalNestedEnumExtensionLite,
+                                  TestAllTypesLite.Types.NestedEnum.BAZ)
+                    .SetExtension(UnittestLite.OptionalNestedMessageExtensionLite,
+                                  TestAllTypesLite.Types.NestedMessage.CreateBuilder().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();
+
+            Assert.AreEqual(123, (int) message2.GetExtension(
+                UnittestLite.OptionalInt32ExtensionLite));
+            Assert.AreEqual(1, message2.GetExtensionCount(
+                UnittestLite.RepeatedStringExtensionLite));
+            Assert.AreEqual(1, message2.GetExtension(
+                UnittestLite.RepeatedStringExtensionLite).Count);
+            Assert.AreEqual("hello", message2.GetExtension(
+                UnittestLite.RepeatedStringExtensionLite, 0));
+            Assert.AreEqual(TestAllTypesLite.Types.NestedEnum.BAZ, message2.GetExtension(
+                UnittestLite.OptionalNestedEnumExtensionLite));
+            Assert.AreEqual(7, message2.GetExtension(
+                UnittestLite.OptionalNestedMessageExtensionLite).Bb);
+        }
+    }
+}
+\ No newline at end of file