diff --git a/src/ProtocolBuffersLite.Test/ExtendableMessageLiteTest.cs b/src/ProtocolBuffersLite.Test/ExtendableMessageLiteTest.cs
index 05ad064..399e308 100644
--- a/src/ProtocolBuffersLite.Test/ExtendableMessageLiteTest.cs
+++ b/src/ProtocolBuffersLite.Test/ExtendableMessageLiteTest.cs
@@ -1,4 +1,5 @@
-﻿#region Copyright notice and license
+#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/
@@ -30,6 +31,7 @@
 // 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 System;
@@ -39,266 +41,292 @@
 using Google.ProtocolBuffers.TestProtos;
 using NUnit.Framework;
 
-namespace Google.ProtocolBuffers {
-  [TestFixture]
-  public class ExtendableMessageLiteTest {
+namespace Google.ProtocolBuffers
+{
+    [TestFixture]
+    public class ExtendableMessageLiteTest
+    {
+        [Test, Ignore("Not implemented, no assertion made"), ExpectedException(typeof (ArgumentException))]
+        public void ExtensionWriterInvalidExtension()
+        {
+            TestPackedExtensionsLite.CreateBuilder()[
+                UnitTestLiteProtoFile.OptionalForeignMessageExtensionLite.Descriptor] =
+                ForeignMessageLite.DefaultInstance;
+        }
 
-    [Test, Ignore("Not implemented, no assertion made"), ExpectedException(typeof(ArgumentException))]
-    public void ExtensionWriterInvalidExtension() {
-      TestPackedExtensionsLite.CreateBuilder()[UnitTestLiteProtoFile.OptionalForeignMessageExtensionLite.Descriptor] = 
-        ForeignMessageLite.DefaultInstance;
+        [Test]
+        public void ExtensionWriterTestMessages()
+        {
+            TestAllExtensionsLite.Builder b = TestAllExtensionsLite.CreateBuilder().SetExtension(
+                UnitTestLiteProtoFile.OptionalForeignMessageExtensionLite,
+                ForeignMessageLite.CreateBuilder().SetC(123).Build());
+            TestAllExtensionsLite copy, msg = b.Build();
+
+            ExtensionRegistry registry = ExtensionRegistry.CreateInstance();
+            UnitTestLiteProtoFile.RegisterAllExtensions(registry);
+
+            copy = TestAllExtensionsLite.ParseFrom(msg.ToByteArray(), registry);
+            Assert.AreEqual(msg.ToByteArray(), copy.ToByteArray());
+        }
+
+        [Test]
+        public void ExtensionWriterIsInitialized()
+        {
+            Assert.IsTrue(ForeignMessageLite.DefaultInstance.IsInitialized);
+            Assert.IsTrue(TestPackedExtensionsLite.CreateBuilder().IsInitialized);
+            Assert.IsTrue(TestAllExtensionsLite.CreateBuilder().SetExtension(
+                UnitTestLiteProtoFile.OptionalForeignMessageExtensionLite, ForeignMessageLite.DefaultInstance)
+                              .IsInitialized);
+        }
+
+        [Test]
+        public void ExtensionWriterTestSetExtensionLists()
+        {
+            TestAllExtensionsLite msg, copy;
+            TestAllExtensionsLite.Builder builder = TestAllExtensionsLite.CreateBuilder()
+                .SetExtension(UnitTestLiteProtoFile.RepeatedBoolExtensionLite, new[] {true, false})
+                .SetExtension(UnitTestLiteProtoFile.RepeatedCordExtensionLite, new[] {"123", "456"})
+                .SetExtension(UnitTestLiteProtoFile.RepeatedForeignEnumExtensionLite,
+                              new[] {ForeignEnumLite.FOREIGN_LITE_BAZ, ForeignEnumLite.FOREIGN_LITE_FOO})
+                ;
+
+            msg = builder.Build();
+            ExtensionRegistry registry = ExtensionRegistry.CreateInstance();
+            UnitTestLiteProtoFile.RegisterAllExtensions(registry);
+
+            copy = TestAllExtensionsLite.ParseFrom(msg.ToByteArray(), registry);
+            Assert.AreEqual(msg.ToByteArray(), copy.ToByteArray());
+
+            Assert.AreEqual(ForeignEnumLite.FOREIGN_LITE_FOO,
+                            copy.GetExtension(UnitTestLiteProtoFile.RepeatedForeignEnumExtensionLite, 1));
+        }
+
+        [Test]
+        public void ExtensionWriterTest()
+        {
+            TestAllExtensionsLite.Builder builder = TestAllExtensionsLite.CreateBuilder()
+                .SetExtension(UnitTestLiteProtoFile.DefaultBoolExtensionLite, true)
+                .SetExtension(UnitTestLiteProtoFile.DefaultBytesExtensionLite, ByteString.CopyFromUtf8("123"))
+                .SetExtension(UnitTestLiteProtoFile.DefaultCordExtensionLite, "123")
+                .SetExtension(UnitTestLiteProtoFile.DefaultDoubleExtensionLite, 123)
+                .SetExtension(UnitTestLiteProtoFile.DefaultFixed32ExtensionLite, 123u)
+                .SetExtension(UnitTestLiteProtoFile.DefaultFixed64ExtensionLite, 123u)
+                .SetExtension(UnitTestLiteProtoFile.DefaultFloatExtensionLite, 123)
+                .SetExtension(UnitTestLiteProtoFile.DefaultForeignEnumExtensionLite, ForeignEnumLite.FOREIGN_LITE_BAZ)
+                .SetExtension(UnitTestLiteProtoFile.DefaultImportEnumExtensionLite, ImportEnumLite.IMPORT_LITE_BAZ)
+                .SetExtension(UnitTestLiteProtoFile.DefaultInt32ExtensionLite, 123)
+                .SetExtension(UnitTestLiteProtoFile.DefaultInt64ExtensionLite, 123)
+                .SetExtension(UnitTestLiteProtoFile.DefaultNestedEnumExtensionLite,
+                              TestAllTypesLite.Types.NestedEnum.FOO)
+                .SetExtension(UnitTestLiteProtoFile.DefaultSfixed32ExtensionLite, 123)
+                .SetExtension(UnitTestLiteProtoFile.DefaultSfixed64ExtensionLite, 123)
+                .SetExtension(UnitTestLiteProtoFile.DefaultSint32ExtensionLite, 123)
+                .SetExtension(UnitTestLiteProtoFile.DefaultSint64ExtensionLite, 123)
+                .SetExtension(UnitTestLiteProtoFile.DefaultStringExtensionLite, "123")
+                .SetExtension(UnitTestLiteProtoFile.DefaultStringPieceExtensionLite, "123")
+                .SetExtension(UnitTestLiteProtoFile.DefaultUint32ExtensionLite, 123u)
+                .SetExtension(UnitTestLiteProtoFile.DefaultUint64ExtensionLite, 123u)
+                //Optional
+                .SetExtension(UnitTestLiteProtoFile.OptionalBoolExtensionLite, true)
+                .SetExtension(UnitTestLiteProtoFile.OptionalBytesExtensionLite, ByteString.CopyFromUtf8("123"))
+                .SetExtension(UnitTestLiteProtoFile.OptionalCordExtensionLite, "123")
+                .SetExtension(UnitTestLiteProtoFile.OptionalDoubleExtensionLite, 123)
+                .SetExtension(UnitTestLiteProtoFile.OptionalFixed32ExtensionLite, 123u)
+                .SetExtension(UnitTestLiteProtoFile.OptionalFixed64ExtensionLite, 123u)
+                .SetExtension(UnitTestLiteProtoFile.OptionalFloatExtensionLite, 123)
+                .SetExtension(UnitTestLiteProtoFile.OptionalForeignEnumExtensionLite, ForeignEnumLite.FOREIGN_LITE_BAZ)
+                .SetExtension(UnitTestLiteProtoFile.OptionalImportEnumExtensionLite, ImportEnumLite.IMPORT_LITE_BAZ)
+                .SetExtension(UnitTestLiteProtoFile.OptionalInt32ExtensionLite, 123)
+                .SetExtension(UnitTestLiteProtoFile.OptionalInt64ExtensionLite, 123)
+                .SetExtension(UnitTestLiteProtoFile.OptionalNestedEnumExtensionLite,
+                              TestAllTypesLite.Types.NestedEnum.FOO)
+                .SetExtension(UnitTestLiteProtoFile.OptionalSfixed32ExtensionLite, 123)
+                .SetExtension(UnitTestLiteProtoFile.OptionalSfixed64ExtensionLite, 123)
+                .SetExtension(UnitTestLiteProtoFile.OptionalSint32ExtensionLite, 123)
+                .SetExtension(UnitTestLiteProtoFile.OptionalSint64ExtensionLite, 123)
+                .SetExtension(UnitTestLiteProtoFile.OptionalStringExtensionLite, "123")
+                .SetExtension(UnitTestLiteProtoFile.OptionalStringPieceExtensionLite, "123")
+                .SetExtension(UnitTestLiteProtoFile.OptionalUint32ExtensionLite, 123u)
+                .SetExtension(UnitTestLiteProtoFile.OptionalUint64ExtensionLite, 123u)
+                //Repeated
+                .AddExtension(UnitTestLiteProtoFile.RepeatedBoolExtensionLite, true)
+                .AddExtension(UnitTestLiteProtoFile.RepeatedBytesExtensionLite, ByteString.CopyFromUtf8("123"))
+                .AddExtension(UnitTestLiteProtoFile.RepeatedCordExtensionLite, "123")
+                .AddExtension(UnitTestLiteProtoFile.RepeatedDoubleExtensionLite, 123)
+                .AddExtension(UnitTestLiteProtoFile.RepeatedFixed32ExtensionLite, 123u)
+                .AddExtension(UnitTestLiteProtoFile.RepeatedFixed64ExtensionLite, 123u)
+                .AddExtension(UnitTestLiteProtoFile.RepeatedFloatExtensionLite, 123)
+                .AddExtension(UnitTestLiteProtoFile.RepeatedForeignEnumExtensionLite, ForeignEnumLite.FOREIGN_LITE_BAZ)
+                .AddExtension(UnitTestLiteProtoFile.RepeatedImportEnumExtensionLite, ImportEnumLite.IMPORT_LITE_BAZ)
+                .AddExtension(UnitTestLiteProtoFile.RepeatedInt32ExtensionLite, 123)
+                .AddExtension(UnitTestLiteProtoFile.RepeatedInt64ExtensionLite, 123)
+                .AddExtension(UnitTestLiteProtoFile.RepeatedNestedEnumExtensionLite,
+                              TestAllTypesLite.Types.NestedEnum.FOO)
+                .AddExtension(UnitTestLiteProtoFile.RepeatedSfixed32ExtensionLite, 123)
+                .AddExtension(UnitTestLiteProtoFile.RepeatedSfixed64ExtensionLite, 123)
+                .AddExtension(UnitTestLiteProtoFile.RepeatedSint32ExtensionLite, 123)
+                .AddExtension(UnitTestLiteProtoFile.RepeatedSint64ExtensionLite, 123)
+                .AddExtension(UnitTestLiteProtoFile.RepeatedStringExtensionLite, "123")
+                .AddExtension(UnitTestLiteProtoFile.RepeatedStringPieceExtensionLite, "123")
+                .AddExtension(UnitTestLiteProtoFile.RepeatedUint32ExtensionLite, 123u)
+                .AddExtension(UnitTestLiteProtoFile.RepeatedUint64ExtensionLite, 123u)
+                ;
+            TestAllExtensionsLite msg = builder.Build();
+
+            ExtensionRegistry registry = ExtensionRegistry.CreateInstance();
+            UnitTestLiteProtoFile.RegisterAllExtensions(registry);
+
+            TestAllExtensionsLite.Builder copyBuilder =
+                TestAllExtensionsLite.CreateBuilder().MergeFrom(msg.ToByteArray(), registry);
+            TestAllExtensionsLite copy = copyBuilder.Build();
+
+            Assert.AreEqual(msg.ToByteArray(), copy.ToByteArray());
+
+            Assert.AreEqual(true, copy.GetExtension(UnitTestLiteProtoFile.DefaultBoolExtensionLite));
+            Assert.AreEqual(ByteString.CopyFromUtf8("123"),
+                            copy.GetExtension(UnitTestLiteProtoFile.DefaultBytesExtensionLite));
+            Assert.AreEqual("123", copy.GetExtension(UnitTestLiteProtoFile.DefaultCordExtensionLite));
+            Assert.AreEqual(123, copy.GetExtension(UnitTestLiteProtoFile.DefaultDoubleExtensionLite));
+            Assert.AreEqual(123u, copy.GetExtension(UnitTestLiteProtoFile.DefaultFixed32ExtensionLite));
+            Assert.AreEqual(123u, copy.GetExtension(UnitTestLiteProtoFile.DefaultFixed64ExtensionLite));
+            Assert.AreEqual(123, copy.GetExtension(UnitTestLiteProtoFile.DefaultFloatExtensionLite));
+            Assert.AreEqual(ForeignEnumLite.FOREIGN_LITE_BAZ,
+                            copy.GetExtension(UnitTestLiteProtoFile.DefaultForeignEnumExtensionLite));
+            Assert.AreEqual(ImportEnumLite.IMPORT_LITE_BAZ,
+                            copy.GetExtension(UnitTestLiteProtoFile.DefaultImportEnumExtensionLite));
+            Assert.AreEqual(123, copy.GetExtension(UnitTestLiteProtoFile.DefaultInt32ExtensionLite));
+            Assert.AreEqual(123, copy.GetExtension(UnitTestLiteProtoFile.DefaultInt64ExtensionLite));
+            Assert.AreEqual(TestAllTypesLite.Types.NestedEnum.FOO,
+                            copy.GetExtension(UnitTestLiteProtoFile.DefaultNestedEnumExtensionLite));
+            Assert.AreEqual(123, copy.GetExtension(UnitTestLiteProtoFile.DefaultSfixed32ExtensionLite));
+            Assert.AreEqual(123, copy.GetExtension(UnitTestLiteProtoFile.DefaultSfixed64ExtensionLite));
+            Assert.AreEqual(123, copy.GetExtension(UnitTestLiteProtoFile.DefaultSint32ExtensionLite));
+            Assert.AreEqual(123, copy.GetExtension(UnitTestLiteProtoFile.DefaultSint64ExtensionLite));
+            Assert.AreEqual("123", copy.GetExtension(UnitTestLiteProtoFile.DefaultStringExtensionLite));
+            Assert.AreEqual("123", copy.GetExtension(UnitTestLiteProtoFile.DefaultStringPieceExtensionLite));
+            Assert.AreEqual(123u, copy.GetExtension(UnitTestLiteProtoFile.DefaultUint32ExtensionLite));
+            Assert.AreEqual(123u, copy.GetExtension(UnitTestLiteProtoFile.DefaultUint64ExtensionLite));
+
+            Assert.AreEqual(true, copy.GetExtension(UnitTestLiteProtoFile.OptionalBoolExtensionLite));
+            Assert.AreEqual(ByteString.CopyFromUtf8("123"),
+                            copy.GetExtension(UnitTestLiteProtoFile.OptionalBytesExtensionLite));
+            Assert.AreEqual("123", copy.GetExtension(UnitTestLiteProtoFile.OptionalCordExtensionLite));
+            Assert.AreEqual(123, copy.GetExtension(UnitTestLiteProtoFile.OptionalDoubleExtensionLite));
+            Assert.AreEqual(123u, copy.GetExtension(UnitTestLiteProtoFile.OptionalFixed32ExtensionLite));
+            Assert.AreEqual(123u, copy.GetExtension(UnitTestLiteProtoFile.OptionalFixed64ExtensionLite));
+            Assert.AreEqual(123, copy.GetExtension(UnitTestLiteProtoFile.OptionalFloatExtensionLite));
+            Assert.AreEqual(ForeignEnumLite.FOREIGN_LITE_BAZ,
+                            copy.GetExtension(UnitTestLiteProtoFile.OptionalForeignEnumExtensionLite));
+            Assert.AreEqual(ImportEnumLite.IMPORT_LITE_BAZ,
+                            copy.GetExtension(UnitTestLiteProtoFile.OptionalImportEnumExtensionLite));
+            Assert.AreEqual(123, copy.GetExtension(UnitTestLiteProtoFile.OptionalInt32ExtensionLite));
+            Assert.AreEqual(123, copy.GetExtension(UnitTestLiteProtoFile.OptionalInt64ExtensionLite));
+            Assert.AreEqual(TestAllTypesLite.Types.NestedEnum.FOO,
+                            copy.GetExtension(UnitTestLiteProtoFile.OptionalNestedEnumExtensionLite));
+            Assert.AreEqual(123, copy.GetExtension(UnitTestLiteProtoFile.OptionalSfixed32ExtensionLite));
+            Assert.AreEqual(123, copy.GetExtension(UnitTestLiteProtoFile.OptionalSfixed64ExtensionLite));
+            Assert.AreEqual(123, copy.GetExtension(UnitTestLiteProtoFile.OptionalSint32ExtensionLite));
+            Assert.AreEqual(123, copy.GetExtension(UnitTestLiteProtoFile.OptionalSint64ExtensionLite));
+            Assert.AreEqual("123", copy.GetExtension(UnitTestLiteProtoFile.OptionalStringExtensionLite));
+            Assert.AreEqual("123", copy.GetExtension(UnitTestLiteProtoFile.OptionalStringPieceExtensionLite));
+            Assert.AreEqual(123u, copy.GetExtension(UnitTestLiteProtoFile.OptionalUint32ExtensionLite));
+            Assert.AreEqual(123u, copy.GetExtension(UnitTestLiteProtoFile.OptionalUint64ExtensionLite));
+
+            Assert.AreEqual(true, copy.GetExtension(UnitTestLiteProtoFile.RepeatedBoolExtensionLite, 0));
+            Assert.AreEqual(ByteString.CopyFromUtf8("123"),
+                            copy.GetExtension(UnitTestLiteProtoFile.RepeatedBytesExtensionLite, 0));
+            Assert.AreEqual("123", copy.GetExtension(UnitTestLiteProtoFile.RepeatedCordExtensionLite, 0));
+            Assert.AreEqual(123, copy.GetExtension(UnitTestLiteProtoFile.RepeatedDoubleExtensionLite, 0));
+            Assert.AreEqual(123u, copy.GetExtension(UnitTestLiteProtoFile.RepeatedFixed32ExtensionLite, 0));
+            Assert.AreEqual(123u, copy.GetExtension(UnitTestLiteProtoFile.RepeatedFixed64ExtensionLite, 0));
+            Assert.AreEqual(123, copy.GetExtension(UnitTestLiteProtoFile.RepeatedFloatExtensionLite, 0));
+            Assert.AreEqual(ForeignEnumLite.FOREIGN_LITE_BAZ,
+                            copy.GetExtension(UnitTestLiteProtoFile.RepeatedForeignEnumExtensionLite, 0));
+            Assert.AreEqual(ImportEnumLite.IMPORT_LITE_BAZ,
+                            copy.GetExtension(UnitTestLiteProtoFile.RepeatedImportEnumExtensionLite, 0));
+            Assert.AreEqual(123, copy.GetExtension(UnitTestLiteProtoFile.RepeatedInt32ExtensionLite, 0));
+            Assert.AreEqual(123, copy.GetExtension(UnitTestLiteProtoFile.RepeatedInt64ExtensionLite, 0));
+            Assert.AreEqual(TestAllTypesLite.Types.NestedEnum.FOO,
+                            copy.GetExtension(UnitTestLiteProtoFile.RepeatedNestedEnumExtensionLite, 0));
+            Assert.AreEqual(123, copy.GetExtension(UnitTestLiteProtoFile.RepeatedSfixed32ExtensionLite, 0));
+            Assert.AreEqual(123, copy.GetExtension(UnitTestLiteProtoFile.RepeatedSfixed64ExtensionLite, 0));
+            Assert.AreEqual(123, copy.GetExtension(UnitTestLiteProtoFile.RepeatedSint32ExtensionLite, 0));
+            Assert.AreEqual(123, copy.GetExtension(UnitTestLiteProtoFile.RepeatedSint64ExtensionLite, 0));
+            Assert.AreEqual("123", copy.GetExtension(UnitTestLiteProtoFile.RepeatedStringExtensionLite, 0));
+            Assert.AreEqual("123", copy.GetExtension(UnitTestLiteProtoFile.RepeatedStringPieceExtensionLite, 0));
+            Assert.AreEqual(123u, copy.GetExtension(UnitTestLiteProtoFile.RepeatedUint32ExtensionLite, 0));
+            Assert.AreEqual(123u, copy.GetExtension(UnitTestLiteProtoFile.RepeatedUint64ExtensionLite, 0));
+        }
+
+        [Test]
+        public void ExtensionWriterTestPacked()
+        {
+            TestPackedExtensionsLite.Builder builder = TestPackedExtensionsLite.CreateBuilder()
+                .AddExtension(UnitTestLiteProtoFile.PackedBoolExtensionLite, true)
+                .AddExtension(UnitTestLiteProtoFile.PackedDoubleExtensionLite, 123)
+                .AddExtension(UnitTestLiteProtoFile.PackedFixed32ExtensionLite, 123u)
+                .AddExtension(UnitTestLiteProtoFile.PackedFixed64ExtensionLite, 123u)
+                .AddExtension(UnitTestLiteProtoFile.PackedFloatExtensionLite, 123)
+                .AddExtension(UnitTestLiteProtoFile.PackedInt32ExtensionLite, 123)
+                .AddExtension(UnitTestLiteProtoFile.PackedInt64ExtensionLite, 123)
+                .AddExtension(UnitTestLiteProtoFile.PackedSfixed32ExtensionLite, 123)
+                .AddExtension(UnitTestLiteProtoFile.PackedSfixed64ExtensionLite, 123)
+                .AddExtension(UnitTestLiteProtoFile.PackedSint32ExtensionLite, 123)
+                .AddExtension(UnitTestLiteProtoFile.PackedSint64ExtensionLite, 123)
+                .AddExtension(UnitTestLiteProtoFile.PackedUint32ExtensionLite, 123u)
+                .AddExtension(UnitTestLiteProtoFile.PackedUint64ExtensionLite, 123u)
+                .AddExtension(UnitTestLiteProtoFile.PackedBoolExtensionLite, true)
+                .AddExtension(UnitTestLiteProtoFile.PackedDoubleExtensionLite, 123)
+                .AddExtension(UnitTestLiteProtoFile.PackedFixed32ExtensionLite, 123u)
+                .AddExtension(UnitTestLiteProtoFile.PackedFixed64ExtensionLite, 123u)
+                .AddExtension(UnitTestLiteProtoFile.PackedFloatExtensionLite, 123)
+                .AddExtension(UnitTestLiteProtoFile.PackedInt32ExtensionLite, 123)
+                .AddExtension(UnitTestLiteProtoFile.PackedInt64ExtensionLite, 123)
+                .AddExtension(UnitTestLiteProtoFile.PackedSfixed32ExtensionLite, 123)
+                .AddExtension(UnitTestLiteProtoFile.PackedSfixed64ExtensionLite, 123)
+                .AddExtension(UnitTestLiteProtoFile.PackedSint32ExtensionLite, 123)
+                .AddExtension(UnitTestLiteProtoFile.PackedSint64ExtensionLite, 123)
+                .AddExtension(UnitTestLiteProtoFile.PackedUint32ExtensionLite, 123u)
+                .AddExtension(UnitTestLiteProtoFile.PackedUint64ExtensionLite, 123u);
+
+            TestPackedExtensionsLite msg = builder.Build();
+
+            ExtensionRegistry registry = ExtensionRegistry.CreateInstance();
+            UnitTestLiteProtoFile.RegisterAllExtensions(registry);
+
+            TestPackedExtensionsLite.Builder copyBuilder =
+                TestPackedExtensionsLite.CreateBuilder().MergeFrom(msg.ToByteArray(), registry);
+            TestPackedExtensionsLite copy = copyBuilder.Build();
+
+            Assert.AreEqual(msg.ToByteArray(), copy.ToByteArray());
+
+            Assert.AreEqual(true, copy.GetExtension(UnitTestLiteProtoFile.PackedBoolExtensionLite, 0));
+            Assert.AreEqual(123, copy.GetExtension(UnitTestLiteProtoFile.PackedDoubleExtensionLite, 0));
+            Assert.AreEqual(123u, copy.GetExtension(UnitTestLiteProtoFile.PackedFixed32ExtensionLite, 0));
+            Assert.AreEqual(123u, copy.GetExtension(UnitTestLiteProtoFile.PackedFixed64ExtensionLite, 0));
+            Assert.AreEqual(123, copy.GetExtension(UnitTestLiteProtoFile.PackedFloatExtensionLite, 0));
+            Assert.AreEqual(123, copy.GetExtension(UnitTestLiteProtoFile.PackedInt32ExtensionLite, 0));
+            Assert.AreEqual(123, copy.GetExtension(UnitTestLiteProtoFile.PackedInt64ExtensionLite, 0));
+            Assert.AreEqual(123, copy.GetExtension(UnitTestLiteProtoFile.PackedSfixed32ExtensionLite, 0));
+            Assert.AreEqual(123, copy.GetExtension(UnitTestLiteProtoFile.PackedSfixed64ExtensionLite, 0));
+            Assert.AreEqual(123, copy.GetExtension(UnitTestLiteProtoFile.PackedSint32ExtensionLite, 0));
+            Assert.AreEqual(123, copy.GetExtension(UnitTestLiteProtoFile.PackedSint64ExtensionLite, 0));
+            Assert.AreEqual(123u, copy.GetExtension(UnitTestLiteProtoFile.PackedUint32ExtensionLite, 0));
+            Assert.AreEqual(123u, copy.GetExtension(UnitTestLiteProtoFile.PackedUint64ExtensionLite, 0));
+
+            Assert.AreEqual(true, copy.GetExtension(UnitTestLiteProtoFile.PackedBoolExtensionLite, 1));
+            Assert.AreEqual(123, copy.GetExtension(UnitTestLiteProtoFile.PackedDoubleExtensionLite, 1));
+            Assert.AreEqual(123u, copy.GetExtension(UnitTestLiteProtoFile.PackedFixed32ExtensionLite, 1));
+            Assert.AreEqual(123u, copy.GetExtension(UnitTestLiteProtoFile.PackedFixed64ExtensionLite, 1));
+            Assert.AreEqual(123, copy.GetExtension(UnitTestLiteProtoFile.PackedFloatExtensionLite, 1));
+            Assert.AreEqual(123, copy.GetExtension(UnitTestLiteProtoFile.PackedInt32ExtensionLite, 1));
+            Assert.AreEqual(123, copy.GetExtension(UnitTestLiteProtoFile.PackedInt64ExtensionLite, 1));
+            Assert.AreEqual(123, copy.GetExtension(UnitTestLiteProtoFile.PackedSfixed32ExtensionLite, 1));
+            Assert.AreEqual(123, copy.GetExtension(UnitTestLiteProtoFile.PackedSfixed64ExtensionLite, 1));
+            Assert.AreEqual(123, copy.GetExtension(UnitTestLiteProtoFile.PackedSint32ExtensionLite, 1));
+            Assert.AreEqual(123, copy.GetExtension(UnitTestLiteProtoFile.PackedSint64ExtensionLite, 1));
+            Assert.AreEqual(123u, copy.GetExtension(UnitTestLiteProtoFile.PackedUint32ExtensionLite, 1));
+            Assert.AreEqual(123u, copy.GetExtension(UnitTestLiteProtoFile.PackedUint64ExtensionLite, 1));
+        }
     }
-
-    [Test]
-    public void ExtensionWriterTestMessages() {
-      TestAllExtensionsLite.Builder b = TestAllExtensionsLite.CreateBuilder().SetExtension(
-        UnitTestLiteProtoFile.OptionalForeignMessageExtensionLite, ForeignMessageLite.CreateBuilder().SetC(123).Build());
-      TestAllExtensionsLite copy, msg = b.Build();
-
-      ExtensionRegistry registry = ExtensionRegistry.CreateInstance();
-      UnitTestLiteProtoFile.RegisterAllExtensions(registry);
-
-      copy = TestAllExtensionsLite.ParseFrom(msg.ToByteArray(), registry);
-      Assert.AreEqual(msg.ToByteArray(), copy.ToByteArray());
-    }
-
-    [Test]
-    public void ExtensionWriterIsInitialized() {
-      Assert.IsTrue(ForeignMessageLite.DefaultInstance.IsInitialized);
-      Assert.IsTrue(TestPackedExtensionsLite.CreateBuilder().IsInitialized);
-      Assert.IsTrue(TestAllExtensionsLite.CreateBuilder().SetExtension(
-        UnitTestLiteProtoFile.OptionalForeignMessageExtensionLite, ForeignMessageLite.DefaultInstance)
-        .IsInitialized);
-    }
-
-    [Test]
-    public void ExtensionWriterTestSetExtensionLists() {
-      TestAllExtensionsLite msg, copy;
-      TestAllExtensionsLite.Builder builder = TestAllExtensionsLite.CreateBuilder()
-        .SetExtension(UnitTestLiteProtoFile.RepeatedBoolExtensionLite, new[] { true, false })
-        .SetExtension(UnitTestLiteProtoFile.RepeatedCordExtensionLite, new[] { "123", "456" })
-        .SetExtension(UnitTestLiteProtoFile.RepeatedForeignEnumExtensionLite, new[] { ForeignEnumLite.FOREIGN_LITE_BAZ, ForeignEnumLite.FOREIGN_LITE_FOO })
-        ;
-
-      msg = builder.Build();
-      ExtensionRegistry registry = ExtensionRegistry.CreateInstance();
-      UnitTestLiteProtoFile.RegisterAllExtensions(registry);
-
-      copy = TestAllExtensionsLite.ParseFrom(msg.ToByteArray(), registry);
-      Assert.AreEqual(msg.ToByteArray(), copy.ToByteArray());
-
-      Assert.AreEqual(ForeignEnumLite.FOREIGN_LITE_FOO, copy.GetExtension(UnitTestLiteProtoFile.RepeatedForeignEnumExtensionLite, 1));
-    }
-
-    [Test]
-    public void ExtensionWriterTest() {
-      TestAllExtensionsLite.Builder builder = TestAllExtensionsLite.CreateBuilder()
-        .SetExtension(UnitTestLiteProtoFile.DefaultBoolExtensionLite, true)
-        .SetExtension(UnitTestLiteProtoFile.DefaultBytesExtensionLite, ByteString.CopyFromUtf8("123"))
-        .SetExtension(UnitTestLiteProtoFile.DefaultCordExtensionLite, "123")
-        .SetExtension(UnitTestLiteProtoFile.DefaultDoubleExtensionLite, 123)
-        .SetExtension(UnitTestLiteProtoFile.DefaultFixed32ExtensionLite, 123u)
-        .SetExtension(UnitTestLiteProtoFile.DefaultFixed64ExtensionLite, 123u)
-        .SetExtension(UnitTestLiteProtoFile.DefaultFloatExtensionLite, 123)
-        .SetExtension(UnitTestLiteProtoFile.DefaultForeignEnumExtensionLite, ForeignEnumLite.FOREIGN_LITE_BAZ)
-        .SetExtension(UnitTestLiteProtoFile.DefaultImportEnumExtensionLite, ImportEnumLite.IMPORT_LITE_BAZ)
-        .SetExtension(UnitTestLiteProtoFile.DefaultInt32ExtensionLite, 123)
-        .SetExtension(UnitTestLiteProtoFile.DefaultInt64ExtensionLite, 123)
-        .SetExtension(UnitTestLiteProtoFile.DefaultNestedEnumExtensionLite, TestAllTypesLite.Types.NestedEnum.FOO)
-        .SetExtension(UnitTestLiteProtoFile.DefaultSfixed32ExtensionLite, 123)
-        .SetExtension(UnitTestLiteProtoFile.DefaultSfixed64ExtensionLite, 123)
-        .SetExtension(UnitTestLiteProtoFile.DefaultSint32ExtensionLite, 123)
-        .SetExtension(UnitTestLiteProtoFile.DefaultSint64ExtensionLite, 123)
-        .SetExtension(UnitTestLiteProtoFile.DefaultStringExtensionLite, "123")
-        .SetExtension(UnitTestLiteProtoFile.DefaultStringPieceExtensionLite, "123")
-        .SetExtension(UnitTestLiteProtoFile.DefaultUint32ExtensionLite, 123u)
-        .SetExtension(UnitTestLiteProtoFile.DefaultUint64ExtensionLite, 123u)
-        //Optional
-        .SetExtension(UnitTestLiteProtoFile.OptionalBoolExtensionLite, true)
-        .SetExtension(UnitTestLiteProtoFile.OptionalBytesExtensionLite, ByteString.CopyFromUtf8("123"))
-        .SetExtension(UnitTestLiteProtoFile.OptionalCordExtensionLite, "123")
-        .SetExtension(UnitTestLiteProtoFile.OptionalDoubleExtensionLite, 123)
-        .SetExtension(UnitTestLiteProtoFile.OptionalFixed32ExtensionLite, 123u)
-        .SetExtension(UnitTestLiteProtoFile.OptionalFixed64ExtensionLite, 123u)
-        .SetExtension(UnitTestLiteProtoFile.OptionalFloatExtensionLite, 123)
-        .SetExtension(UnitTestLiteProtoFile.OptionalForeignEnumExtensionLite, ForeignEnumLite.FOREIGN_LITE_BAZ)
-        .SetExtension(UnitTestLiteProtoFile.OptionalImportEnumExtensionLite, ImportEnumLite.IMPORT_LITE_BAZ)
-        .SetExtension(UnitTestLiteProtoFile.OptionalInt32ExtensionLite, 123)
-        .SetExtension(UnitTestLiteProtoFile.OptionalInt64ExtensionLite, 123)
-        .SetExtension(UnitTestLiteProtoFile.OptionalNestedEnumExtensionLite, TestAllTypesLite.Types.NestedEnum.FOO)
-        .SetExtension(UnitTestLiteProtoFile.OptionalSfixed32ExtensionLite, 123)
-        .SetExtension(UnitTestLiteProtoFile.OptionalSfixed64ExtensionLite, 123)
-        .SetExtension(UnitTestLiteProtoFile.OptionalSint32ExtensionLite, 123)
-        .SetExtension(UnitTestLiteProtoFile.OptionalSint64ExtensionLite, 123)
-        .SetExtension(UnitTestLiteProtoFile.OptionalStringExtensionLite, "123")
-        .SetExtension(UnitTestLiteProtoFile.OptionalStringPieceExtensionLite, "123")
-        .SetExtension(UnitTestLiteProtoFile.OptionalUint32ExtensionLite, 123u)
-        .SetExtension(UnitTestLiteProtoFile.OptionalUint64ExtensionLite, 123u)
-        //Repeated
-        .AddExtension(UnitTestLiteProtoFile.RepeatedBoolExtensionLite, true)
-        .AddExtension(UnitTestLiteProtoFile.RepeatedBytesExtensionLite, ByteString.CopyFromUtf8("123"))
-        .AddExtension(UnitTestLiteProtoFile.RepeatedCordExtensionLite, "123")
-        .AddExtension(UnitTestLiteProtoFile.RepeatedDoubleExtensionLite, 123)
-        .AddExtension(UnitTestLiteProtoFile.RepeatedFixed32ExtensionLite, 123u)
-        .AddExtension(UnitTestLiteProtoFile.RepeatedFixed64ExtensionLite, 123u)
-        .AddExtension(UnitTestLiteProtoFile.RepeatedFloatExtensionLite, 123)
-        .AddExtension(UnitTestLiteProtoFile.RepeatedForeignEnumExtensionLite, ForeignEnumLite.FOREIGN_LITE_BAZ)
-        .AddExtension(UnitTestLiteProtoFile.RepeatedImportEnumExtensionLite, ImportEnumLite.IMPORT_LITE_BAZ)
-        .AddExtension(UnitTestLiteProtoFile.RepeatedInt32ExtensionLite, 123)
-        .AddExtension(UnitTestLiteProtoFile.RepeatedInt64ExtensionLite, 123)
-        .AddExtension(UnitTestLiteProtoFile.RepeatedNestedEnumExtensionLite, TestAllTypesLite.Types.NestedEnum.FOO)
-        .AddExtension(UnitTestLiteProtoFile.RepeatedSfixed32ExtensionLite, 123)
-        .AddExtension(UnitTestLiteProtoFile.RepeatedSfixed64ExtensionLite, 123)
-        .AddExtension(UnitTestLiteProtoFile.RepeatedSint32ExtensionLite, 123)
-        .AddExtension(UnitTestLiteProtoFile.RepeatedSint64ExtensionLite, 123)
-        .AddExtension(UnitTestLiteProtoFile.RepeatedStringExtensionLite, "123")
-        .AddExtension(UnitTestLiteProtoFile.RepeatedStringPieceExtensionLite, "123")
-        .AddExtension(UnitTestLiteProtoFile.RepeatedUint32ExtensionLite, 123u)
-        .AddExtension(UnitTestLiteProtoFile.RepeatedUint64ExtensionLite, 123u)
-        ;
-      TestAllExtensionsLite msg = builder.Build();
-
-      ExtensionRegistry registry = ExtensionRegistry.CreateInstance();
-      UnitTestLiteProtoFile.RegisterAllExtensions(registry);
-
-      TestAllExtensionsLite.Builder copyBuilder = TestAllExtensionsLite.CreateBuilder().MergeFrom(msg.ToByteArray(), registry);
-      TestAllExtensionsLite copy = copyBuilder.Build();
-
-      Assert.AreEqual(msg.ToByteArray(), copy.ToByteArray());
-
-      Assert.AreEqual(true, copy.GetExtension(UnitTestLiteProtoFile.DefaultBoolExtensionLite));
-      Assert.AreEqual(ByteString.CopyFromUtf8("123"), copy.GetExtension(UnitTestLiteProtoFile.DefaultBytesExtensionLite));
-      Assert.AreEqual("123", copy.GetExtension(UnitTestLiteProtoFile.DefaultCordExtensionLite));
-      Assert.AreEqual(123, copy.GetExtension(UnitTestLiteProtoFile.DefaultDoubleExtensionLite));
-      Assert.AreEqual(123u, copy.GetExtension(UnitTestLiteProtoFile.DefaultFixed32ExtensionLite));
-      Assert.AreEqual(123u, copy.GetExtension(UnitTestLiteProtoFile.DefaultFixed64ExtensionLite));
-      Assert.AreEqual(123, copy.GetExtension(UnitTestLiteProtoFile.DefaultFloatExtensionLite));
-      Assert.AreEqual(ForeignEnumLite.FOREIGN_LITE_BAZ, copy.GetExtension(UnitTestLiteProtoFile.DefaultForeignEnumExtensionLite));
-      Assert.AreEqual(ImportEnumLite.IMPORT_LITE_BAZ, copy.GetExtension(UnitTestLiteProtoFile.DefaultImportEnumExtensionLite));
-      Assert.AreEqual(123, copy.GetExtension(UnitTestLiteProtoFile.DefaultInt32ExtensionLite));
-      Assert.AreEqual(123, copy.GetExtension(UnitTestLiteProtoFile.DefaultInt64ExtensionLite));
-      Assert.AreEqual(TestAllTypesLite.Types.NestedEnum.FOO, copy.GetExtension(UnitTestLiteProtoFile.DefaultNestedEnumExtensionLite));
-      Assert.AreEqual(123, copy.GetExtension(UnitTestLiteProtoFile.DefaultSfixed32ExtensionLite));
-      Assert.AreEqual(123, copy.GetExtension(UnitTestLiteProtoFile.DefaultSfixed64ExtensionLite));
-      Assert.AreEqual(123, copy.GetExtension(UnitTestLiteProtoFile.DefaultSint32ExtensionLite));
-      Assert.AreEqual(123, copy.GetExtension(UnitTestLiteProtoFile.DefaultSint64ExtensionLite));
-      Assert.AreEqual("123", copy.GetExtension(UnitTestLiteProtoFile.DefaultStringExtensionLite));
-      Assert.AreEqual("123", copy.GetExtension(UnitTestLiteProtoFile.DefaultStringPieceExtensionLite));
-      Assert.AreEqual(123u, copy.GetExtension(UnitTestLiteProtoFile.DefaultUint32ExtensionLite));
-      Assert.AreEqual(123u, copy.GetExtension(UnitTestLiteProtoFile.DefaultUint64ExtensionLite));
-
-      Assert.AreEqual(true, copy.GetExtension(UnitTestLiteProtoFile.OptionalBoolExtensionLite));
-      Assert.AreEqual(ByteString.CopyFromUtf8("123"), copy.GetExtension(UnitTestLiteProtoFile.OptionalBytesExtensionLite));
-      Assert.AreEqual("123", copy.GetExtension(UnitTestLiteProtoFile.OptionalCordExtensionLite));
-      Assert.AreEqual(123, copy.GetExtension(UnitTestLiteProtoFile.OptionalDoubleExtensionLite));
-      Assert.AreEqual(123u, copy.GetExtension(UnitTestLiteProtoFile.OptionalFixed32ExtensionLite));
-      Assert.AreEqual(123u, copy.GetExtension(UnitTestLiteProtoFile.OptionalFixed64ExtensionLite));
-      Assert.AreEqual(123, copy.GetExtension(UnitTestLiteProtoFile.OptionalFloatExtensionLite));
-      Assert.AreEqual(ForeignEnumLite.FOREIGN_LITE_BAZ, copy.GetExtension(UnitTestLiteProtoFile.OptionalForeignEnumExtensionLite));
-      Assert.AreEqual(ImportEnumLite.IMPORT_LITE_BAZ, copy.GetExtension(UnitTestLiteProtoFile.OptionalImportEnumExtensionLite));
-      Assert.AreEqual(123, copy.GetExtension(UnitTestLiteProtoFile.OptionalInt32ExtensionLite));
-      Assert.AreEqual(123, copy.GetExtension(UnitTestLiteProtoFile.OptionalInt64ExtensionLite));
-      Assert.AreEqual(TestAllTypesLite.Types.NestedEnum.FOO, copy.GetExtension(UnitTestLiteProtoFile.OptionalNestedEnumExtensionLite));
-      Assert.AreEqual(123, copy.GetExtension(UnitTestLiteProtoFile.OptionalSfixed32ExtensionLite));
-      Assert.AreEqual(123, copy.GetExtension(UnitTestLiteProtoFile.OptionalSfixed64ExtensionLite));
-      Assert.AreEqual(123, copy.GetExtension(UnitTestLiteProtoFile.OptionalSint32ExtensionLite));
-      Assert.AreEqual(123, copy.GetExtension(UnitTestLiteProtoFile.OptionalSint64ExtensionLite));
-      Assert.AreEqual("123", copy.GetExtension(UnitTestLiteProtoFile.OptionalStringExtensionLite));
-      Assert.AreEqual("123", copy.GetExtension(UnitTestLiteProtoFile.OptionalStringPieceExtensionLite));
-      Assert.AreEqual(123u, copy.GetExtension(UnitTestLiteProtoFile.OptionalUint32ExtensionLite));
-      Assert.AreEqual(123u, copy.GetExtension(UnitTestLiteProtoFile.OptionalUint64ExtensionLite));
-
-      Assert.AreEqual(true, copy.GetExtension(UnitTestLiteProtoFile.RepeatedBoolExtensionLite, 0));
-      Assert.AreEqual(ByteString.CopyFromUtf8("123"), copy.GetExtension(UnitTestLiteProtoFile.RepeatedBytesExtensionLite, 0));
-      Assert.AreEqual("123", copy.GetExtension(UnitTestLiteProtoFile.RepeatedCordExtensionLite, 0));
-      Assert.AreEqual(123, copy.GetExtension(UnitTestLiteProtoFile.RepeatedDoubleExtensionLite, 0));
-      Assert.AreEqual(123u, copy.GetExtension(UnitTestLiteProtoFile.RepeatedFixed32ExtensionLite, 0));
-      Assert.AreEqual(123u, copy.GetExtension(UnitTestLiteProtoFile.RepeatedFixed64ExtensionLite, 0));
-      Assert.AreEqual(123, copy.GetExtension(UnitTestLiteProtoFile.RepeatedFloatExtensionLite, 0));
-      Assert.AreEqual(ForeignEnumLite.FOREIGN_LITE_BAZ, copy.GetExtension(UnitTestLiteProtoFile.RepeatedForeignEnumExtensionLite, 0));
-      Assert.AreEqual(ImportEnumLite.IMPORT_LITE_BAZ, copy.GetExtension(UnitTestLiteProtoFile.RepeatedImportEnumExtensionLite, 0));
-      Assert.AreEqual(123, copy.GetExtension(UnitTestLiteProtoFile.RepeatedInt32ExtensionLite, 0));
-      Assert.AreEqual(123, copy.GetExtension(UnitTestLiteProtoFile.RepeatedInt64ExtensionLite, 0));
-      Assert.AreEqual(TestAllTypesLite.Types.NestedEnum.FOO, copy.GetExtension(UnitTestLiteProtoFile.RepeatedNestedEnumExtensionLite, 0));
-      Assert.AreEqual(123, copy.GetExtension(UnitTestLiteProtoFile.RepeatedSfixed32ExtensionLite, 0));
-      Assert.AreEqual(123, copy.GetExtension(UnitTestLiteProtoFile.RepeatedSfixed64ExtensionLite, 0));
-      Assert.AreEqual(123, copy.GetExtension(UnitTestLiteProtoFile.RepeatedSint32ExtensionLite, 0));
-      Assert.AreEqual(123, copy.GetExtension(UnitTestLiteProtoFile.RepeatedSint64ExtensionLite, 0));
-      Assert.AreEqual("123", copy.GetExtension(UnitTestLiteProtoFile.RepeatedStringExtensionLite, 0));
-      Assert.AreEqual("123", copy.GetExtension(UnitTestLiteProtoFile.RepeatedStringPieceExtensionLite, 0));
-      Assert.AreEqual(123u, copy.GetExtension(UnitTestLiteProtoFile.RepeatedUint32ExtensionLite, 0));
-      Assert.AreEqual(123u, copy.GetExtension(UnitTestLiteProtoFile.RepeatedUint64ExtensionLite, 0));
-    }
-
-    [Test]
-    public void ExtensionWriterTestPacked() {
-
-      TestPackedExtensionsLite.Builder builder = TestPackedExtensionsLite.CreateBuilder()
-        .AddExtension(UnitTestLiteProtoFile.PackedBoolExtensionLite, true)
-        .AddExtension(UnitTestLiteProtoFile.PackedDoubleExtensionLite, 123)
-        .AddExtension(UnitTestLiteProtoFile.PackedFixed32ExtensionLite, 123u)
-        .AddExtension(UnitTestLiteProtoFile.PackedFixed64ExtensionLite, 123u)
-        .AddExtension(UnitTestLiteProtoFile.PackedFloatExtensionLite, 123)
-        .AddExtension(UnitTestLiteProtoFile.PackedInt32ExtensionLite, 123)
-        .AddExtension(UnitTestLiteProtoFile.PackedInt64ExtensionLite, 123)
-        .AddExtension(UnitTestLiteProtoFile.PackedSfixed32ExtensionLite, 123)
-        .AddExtension(UnitTestLiteProtoFile.PackedSfixed64ExtensionLite, 123)
-        .AddExtension(UnitTestLiteProtoFile.PackedSint32ExtensionLite, 123)
-        .AddExtension(UnitTestLiteProtoFile.PackedSint64ExtensionLite, 123)
-        .AddExtension(UnitTestLiteProtoFile.PackedUint32ExtensionLite, 123u)
-        .AddExtension(UnitTestLiteProtoFile.PackedUint64ExtensionLite, 123u)
-        .AddExtension(UnitTestLiteProtoFile.PackedBoolExtensionLite, true)
-        .AddExtension(UnitTestLiteProtoFile.PackedDoubleExtensionLite, 123)
-        .AddExtension(UnitTestLiteProtoFile.PackedFixed32ExtensionLite, 123u)
-        .AddExtension(UnitTestLiteProtoFile.PackedFixed64ExtensionLite, 123u)
-        .AddExtension(UnitTestLiteProtoFile.PackedFloatExtensionLite, 123)
-        .AddExtension(UnitTestLiteProtoFile.PackedInt32ExtensionLite, 123)
-        .AddExtension(UnitTestLiteProtoFile.PackedInt64ExtensionLite, 123)
-        .AddExtension(UnitTestLiteProtoFile.PackedSfixed32ExtensionLite, 123)
-        .AddExtension(UnitTestLiteProtoFile.PackedSfixed64ExtensionLite, 123)
-        .AddExtension(UnitTestLiteProtoFile.PackedSint32ExtensionLite, 123)
-        .AddExtension(UnitTestLiteProtoFile.PackedSint64ExtensionLite, 123)
-        .AddExtension(UnitTestLiteProtoFile.PackedUint32ExtensionLite, 123u)
-        .AddExtension(UnitTestLiteProtoFile.PackedUint64ExtensionLite, 123u);
-
-      TestPackedExtensionsLite msg = builder.Build();
-
-      ExtensionRegistry registry = ExtensionRegistry.CreateInstance();
-      UnitTestLiteProtoFile.RegisterAllExtensions(registry);
-
-      TestPackedExtensionsLite.Builder copyBuilder = TestPackedExtensionsLite.CreateBuilder().MergeFrom(msg.ToByteArray(), registry);
-      TestPackedExtensionsLite copy = copyBuilder.Build();
-
-      Assert.AreEqual(msg.ToByteArray(), copy.ToByteArray());
-
-      Assert.AreEqual(true, copy.GetExtension(UnitTestLiteProtoFile.PackedBoolExtensionLite, 0));
-      Assert.AreEqual(123, copy.GetExtension(UnitTestLiteProtoFile.PackedDoubleExtensionLite, 0));
-      Assert.AreEqual(123u, copy.GetExtension(UnitTestLiteProtoFile.PackedFixed32ExtensionLite, 0));
-      Assert.AreEqual(123u, copy.GetExtension(UnitTestLiteProtoFile.PackedFixed64ExtensionLite, 0));
-      Assert.AreEqual(123, copy.GetExtension(UnitTestLiteProtoFile.PackedFloatExtensionLite, 0));
-      Assert.AreEqual(123, copy.GetExtension(UnitTestLiteProtoFile.PackedInt32ExtensionLite, 0));
-      Assert.AreEqual(123, copy.GetExtension(UnitTestLiteProtoFile.PackedInt64ExtensionLite, 0));
-      Assert.AreEqual(123, copy.GetExtension(UnitTestLiteProtoFile.PackedSfixed32ExtensionLite, 0));
-      Assert.AreEqual(123, copy.GetExtension(UnitTestLiteProtoFile.PackedSfixed64ExtensionLite, 0));
-      Assert.AreEqual(123, copy.GetExtension(UnitTestLiteProtoFile.PackedSint32ExtensionLite, 0));
-      Assert.AreEqual(123, copy.GetExtension(UnitTestLiteProtoFile.PackedSint64ExtensionLite, 0));
-      Assert.AreEqual(123u, copy.GetExtension(UnitTestLiteProtoFile.PackedUint32ExtensionLite, 0));
-      Assert.AreEqual(123u, copy.GetExtension(UnitTestLiteProtoFile.PackedUint64ExtensionLite, 0));
-
-      Assert.AreEqual(true, copy.GetExtension(UnitTestLiteProtoFile.PackedBoolExtensionLite, 1));
-      Assert.AreEqual(123, copy.GetExtension(UnitTestLiteProtoFile.PackedDoubleExtensionLite, 1));
-      Assert.AreEqual(123u, copy.GetExtension(UnitTestLiteProtoFile.PackedFixed32ExtensionLite, 1));
-      Assert.AreEqual(123u, copy.GetExtension(UnitTestLiteProtoFile.PackedFixed64ExtensionLite, 1));
-      Assert.AreEqual(123, copy.GetExtension(UnitTestLiteProtoFile.PackedFloatExtensionLite, 1));
-      Assert.AreEqual(123, copy.GetExtension(UnitTestLiteProtoFile.PackedInt32ExtensionLite, 1));
-      Assert.AreEqual(123, copy.GetExtension(UnitTestLiteProtoFile.PackedInt64ExtensionLite, 1));
-      Assert.AreEqual(123, copy.GetExtension(UnitTestLiteProtoFile.PackedSfixed32ExtensionLite, 1));
-      Assert.AreEqual(123, copy.GetExtension(UnitTestLiteProtoFile.PackedSfixed64ExtensionLite, 1));
-      Assert.AreEqual(123, copy.GetExtension(UnitTestLiteProtoFile.PackedSint32ExtensionLite, 1));
-      Assert.AreEqual(123, copy.GetExtension(UnitTestLiteProtoFile.PackedSint64ExtensionLite, 1));
-      Assert.AreEqual(123u, copy.GetExtension(UnitTestLiteProtoFile.PackedUint32ExtensionLite, 1));
-      Assert.AreEqual(123u, copy.GetExtension(UnitTestLiteProtoFile.PackedUint64ExtensionLite, 1));
-
-    }
-  }
-}
+}
\ No newline at end of file