Testing and related fixes
diff --git a/src/ProtocolBuffersLite.Test/ExtendableMessageLiteTest.cs b/src/ProtocolBuffersLite.Test/ExtendableMessageLiteTest.cs
new file mode 100644
index 0000000..0b12d25
--- /dev/null
+++ b/src/ProtocolBuffersLite.Test/ExtendableMessageLiteTest.cs
@@ -0,0 +1,304 @@
+#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 System;
+using System.Collections.Generic;
+using System.Text;
+using Google.ProtocolBuffers;
+using Google.ProtocolBuffers.TestProtos;
+using NUnit.Framework;
+
+namespace Google.ProtocolBuffers {
+  [TestFixture]
+  public class ExtendableMessageLiteTest {
+
+
+    [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 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_FOO)
+          .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_FOO)
+          .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_FOO)
+          .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)
+        ;
+      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_FOO)
+          .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)
+        ;
+
+      TestAllExtensionsLite msg = builder.Build();
+      byte[] data = msg.ToByteArray();
+      TestAllExtensionsLite.Builder copyBuilder = TestAllExtensionsLite.CreateBuilder().MergeFrom(data);
+      TestAllExtensionsLite copy = copyBuilder.Build();
+
+      Assert.AreEqual(msg.ToByteArray(), copy.ToByteArray());
+    }
+     * 
+          //Packed
+          .SetExtension(UnitTestLiteProtoFile.PackedBoolExtensionLite, true)
+          .SetExtension(UnitTestLiteProtoFile.PackedDoubleExtensionLite, 123)
+          .SetExtension(UnitTestLiteProtoFile.PackedFixed32ExtensionLite, 123u)
+          .SetExtension(UnitTestLiteProtoFile.PackedFixed64ExtensionLite, 123u)
+          .SetExtension(UnitTestLiteProtoFile.PackedFloatExtensionLite, 123)
+          .SetExtension(UnitTestLiteProtoFile.PackedInt32ExtensionLite, 123)
+          .SetExtension(UnitTestLiteProtoFile.PackedInt64ExtensionLite, 123)
+          .SetExtension(UnitTestLiteProtoFile.PackedSfixed32ExtensionLite, 123)
+          .SetExtension(UnitTestLiteProtoFile.PackedSfixed64ExtensionLite, 123)
+          .SetExtension(UnitTestLiteProtoFile.PackedSint32ExtensionLite, 123)
+          .SetExtension(UnitTestLiteProtoFile.PackedSint64ExtensionLite, 123)
+          .SetExtension(UnitTestLiteProtoFile.PackedUint32ExtensionLite, 123u)
+          .SetExtension(UnitTestLiteProtoFile.PackedUint64ExtensionLite, 123u)
+     */
+  }
+}