1 files changed, 1812 insertions, 0 deletions
diff --git a/csharp/src/ProtocolBuffers.Test/TestUtil.cs b/csharp/src/ProtocolBuffers.Test/TestUtil.cs
new file mode 100644
index 00000000..19c0df34
--- /dev/null
+++ b/csharp/src/ProtocolBuffers.Test/TestUtil.cs
@@ -0,0 +1,1812 @@
+#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.Globalization;
+using System.IO;
+using System.Text;
+using System.Threading;
+using Google.ProtocolBuffers.TestProtos;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+
+namespace Google.ProtocolBuffers
+{
+    internal static class TestUtil
+    {
+        private static ByteString goldenMessage = null;
+
+        internal static ByteString GoldenMessage
+        {
+            get
+            {
+                if (goldenMessage == null)
+                {
+                    goldenMessage = ByteString.CopyFrom(TestResources.golden_message);
+                }
+                return goldenMessage;
+            }
+        }
+
+        private static ByteString goldenPackedFieldsMessage = null;
+
+        /// <summary>
+        /// Get the bytes of the "golden packed fields message".  This is a serialized
+        /// TestPackedTypes with all fields set as they would be by SetPackedFields,
+        /// but it is loaded from a file on disk rather than generated dynamically.
+        /// The file is actually generated by C++ code, so testing against it verifies compatibility
+        /// with C++.
+        /// </summary>
+        public static ByteString GetGoldenPackedFieldsMessage()
+        {
+            if (goldenPackedFieldsMessage == null)
+            {
+                goldenPackedFieldsMessage = ByteString.CopyFrom(TestResources.golden_packed_fields_message);
+            }
+            return goldenPackedFieldsMessage;
+        }
+
+        /// <summary>
+        /// Creates an unmodifiable ExtensionRegistry containing all the extensions
+        /// of TestAllExtensions.
+        /// </summary>
+        /// <returns></returns>
+        internal static ExtensionRegistry CreateExtensionRegistry()
+        {
+            ExtensionRegistry registry = ExtensionRegistry.CreateInstance();
+            RegisterAllExtensions(registry);
+            return registry.AsReadOnly();
+        }
+
+        /// <summary>
+        /// Registers all of the extensions in TestAllExtensions with the given
+        /// ExtensionRegistry.
+        /// </summary>
+        internal static void RegisterAllExtensions(ExtensionRegistry registry)
+        {
+            registry.Add(UnitTestProtoFile.OptionalInt32Extension);
+            registry.Add(UnitTestProtoFile.OptionalInt64Extension);
+            registry.Add(UnitTestProtoFile.OptionalUint32Extension);
+            registry.Add(UnitTestProtoFile.OptionalUint64Extension);
+            registry.Add(UnitTestProtoFile.OptionalSint32Extension);
+            registry.Add(UnitTestProtoFile.OptionalSint64Extension);
+            registry.Add(UnitTestProtoFile.OptionalFixed32Extension);
+            registry.Add(UnitTestProtoFile.OptionalFixed64Extension);
+            registry.Add(UnitTestProtoFile.OptionalSfixed32Extension);
+            registry.Add(UnitTestProtoFile.OptionalSfixed64Extension);
+            registry.Add(UnitTestProtoFile.OptionalFloatExtension);
+            registry.Add(UnitTestProtoFile.OptionalDoubleExtension);
+            registry.Add(UnitTestProtoFile.OptionalBoolExtension);
+            registry.Add(UnitTestProtoFile.OptionalStringExtension);
+            registry.Add(UnitTestProtoFile.OptionalBytesExtension);
+            registry.Add(UnitTestProtoFile.OptionalGroupExtension);
+            registry.Add(UnitTestProtoFile.OptionalNestedMessageExtension);
+            registry.Add(UnitTestProtoFile.OptionalForeignMessageExtension);
+            registry.Add(UnitTestProtoFile.OptionalImportMessageExtension);
+            registry.Add(UnitTestProtoFile.OptionalNestedEnumExtension);
+            registry.Add(UnitTestProtoFile.OptionalForeignEnumExtension);
+            registry.Add(UnitTestProtoFile.OptionalImportEnumExtension);
+            registry.Add(UnitTestProtoFile.OptionalStringPieceExtension);
+            registry.Add(UnitTestProtoFile.OptionalCordExtension);
+
+            registry.Add(UnitTestProtoFile.RepeatedInt32Extension);
+            registry.Add(UnitTestProtoFile.RepeatedInt64Extension);
+            registry.Add(UnitTestProtoFile.RepeatedUint32Extension);
+            registry.Add(UnitTestProtoFile.RepeatedUint64Extension);
+            registry.Add(UnitTestProtoFile.RepeatedSint32Extension);
+            registry.Add(UnitTestProtoFile.RepeatedSint64Extension);
+            registry.Add(UnitTestProtoFile.RepeatedFixed32Extension);
+            registry.Add(UnitTestProtoFile.RepeatedFixed64Extension);
+            registry.Add(UnitTestProtoFile.RepeatedSfixed32Extension);
+            registry.Add(UnitTestProtoFile.RepeatedSfixed64Extension);
+            registry.Add(UnitTestProtoFile.RepeatedFloatExtension);
+            registry.Add(UnitTestProtoFile.RepeatedDoubleExtension);
+            registry.Add(UnitTestProtoFile.RepeatedBoolExtension);
+            registry.Add(UnitTestProtoFile.RepeatedStringExtension);
+            registry.Add(UnitTestProtoFile.RepeatedBytesExtension);
+            registry.Add(UnitTestProtoFile.RepeatedGroupExtension);
+            registry.Add(UnitTestProtoFile.RepeatedNestedMessageExtension);
+            registry.Add(UnitTestProtoFile.RepeatedForeignMessageExtension);
+            registry.Add(UnitTestProtoFile.RepeatedImportMessageExtension);
+            registry.Add(UnitTestProtoFile.RepeatedNestedEnumExtension);
+            registry.Add(UnitTestProtoFile.RepeatedForeignEnumExtension);
+            registry.Add(UnitTestProtoFile.RepeatedImportEnumExtension);
+            registry.Add(UnitTestProtoFile.RepeatedStringPieceExtension);
+            registry.Add(UnitTestProtoFile.RepeatedCordExtension);
+
+            registry.Add(UnitTestProtoFile.DefaultInt32Extension);
+            registry.Add(UnitTestProtoFile.DefaultInt64Extension);
+            registry.Add(UnitTestProtoFile.DefaultUint32Extension);
+            registry.Add(UnitTestProtoFile.DefaultUint64Extension);
+            registry.Add(UnitTestProtoFile.DefaultSint32Extension);
+            registry.Add(UnitTestProtoFile.DefaultSint64Extension);
+            registry.Add(UnitTestProtoFile.DefaultFixed32Extension);
+            registry.Add(UnitTestProtoFile.DefaultFixed64Extension);
+            registry.Add(UnitTestProtoFile.DefaultSfixed32Extension);
+            registry.Add(UnitTestProtoFile.DefaultSfixed64Extension);
+            registry.Add(UnitTestProtoFile.DefaultFloatExtension);
+            registry.Add(UnitTestProtoFile.DefaultDoubleExtension);
+            registry.Add(UnitTestProtoFile.DefaultBoolExtension);
+            registry.Add(UnitTestProtoFile.DefaultStringExtension);
+            registry.Add(UnitTestProtoFile.DefaultBytesExtension);
+            registry.Add(UnitTestProtoFile.DefaultNestedEnumExtension);
+            registry.Add(UnitTestProtoFile.DefaultForeignEnumExtension);
+            registry.Add(UnitTestProtoFile.DefaultImportEnumExtension);
+            registry.Add(UnitTestProtoFile.DefaultStringPieceExtension);
+            registry.Add(UnitTestProtoFile.DefaultCordExtension);
+
+            registry.Add(UnitTestProtoFile.PackedInt32Extension);
+            registry.Add(UnitTestProtoFile.PackedInt64Extension);
+            registry.Add(UnitTestProtoFile.PackedUint32Extension);
+            registry.Add(UnitTestProtoFile.PackedUint64Extension);
+            registry.Add(UnitTestProtoFile.PackedSint32Extension);
+            registry.Add(UnitTestProtoFile.PackedSint64Extension);
+            registry.Add(UnitTestProtoFile.PackedFixed32Extension);
+            registry.Add(UnitTestProtoFile.PackedFixed64Extension);
+            registry.Add(UnitTestProtoFile.PackedSfixed32Extension);
+            registry.Add(UnitTestProtoFile.PackedSfixed64Extension);
+            registry.Add(UnitTestProtoFile.PackedFloatExtension);
+            registry.Add(UnitTestProtoFile.PackedDoubleExtension);
+            registry.Add(UnitTestProtoFile.PackedBoolExtension);
+            registry.Add(UnitTestProtoFile.PackedEnumExtension);
+        }
+
+        /// <summary>
+        /// Helper to convert a String to ByteString.
+        /// </summary>
+        internal static ByteString ToBytes(String str)
+        {
+            return ByteString.CopyFrom(Encoding.UTF8.GetBytes(str));
+        }
+
+        internal static TestAllTypes GetAllSet()
+        {
+            TestAllTypes.Builder builder = TestAllTypes.CreateBuilder();
+            SetAllFields(builder);
+            return builder.Build();
+        }
+
+        /// <summary>
+        /// Sets every field of the specified message to the values expected by
+        /// AssertAllFieldsSet.
+        /// </summary>
+        internal static void SetAllFields(TestAllTypes.Builder message)
+        {
+            message.SetOptionalInt32(101);
+            message.SetOptionalInt64(102);
+            message.SetOptionalUint32(103);
+            message.SetOptionalUint64(104);
+            message.SetOptionalSint32(105);
+            message.SetOptionalSint64(106);
+            message.SetOptionalFixed32(107);
+            message.SetOptionalFixed64(108);
+            message.SetOptionalSfixed32(109);
+            message.SetOptionalSfixed64(110);
+            message.SetOptionalFloat(111);
+            message.SetOptionalDouble(112);
+            message.SetOptionalBool(true);
+            message.SetOptionalString("115");
+            message.SetOptionalBytes(ToBytes("116"));
+
+            message.SetOptionalGroup(TestAllTypes.Types.OptionalGroup.CreateBuilder().SetA(117).Build());
+            message.SetOptionalNestedMessage(TestAllTypes.Types.NestedMessage.CreateBuilder().SetBb(118).Build());
+            message.SetOptionalForeignMessage(ForeignMessage.CreateBuilder().SetC(119).Build());
+            message.SetOptionalImportMessage(ImportMessage.CreateBuilder().SetD(120).Build());
+
+            message.SetOptionalNestedEnum(TestAllTypes.Types.NestedEnum.BAZ);
+            message.SetOptionalForeignEnum(ForeignEnum.FOREIGN_BAZ);
+            message.SetOptionalImportEnum(ImportEnum.IMPORT_BAZ);
+
+            message.SetOptionalStringPiece("124");
+            message.SetOptionalCord("125");
+
+            // -----------------------------------------------------------------
+
+            message.AddRepeatedInt32(201);
+            message.AddRepeatedInt64(202);
+            message.AddRepeatedUint32(203);
+            message.AddRepeatedUint64(204);
+            message.AddRepeatedSint32(205);
+            message.AddRepeatedSint64(206);
+            message.AddRepeatedFixed32(207);
+            message.AddRepeatedFixed64(208);
+            message.AddRepeatedSfixed32(209);
+            message.AddRepeatedSfixed64(210);
+            message.AddRepeatedFloat(211);
+            message.AddRepeatedDouble(212);
+            message.AddRepeatedBool(true);
+            message.AddRepeatedString("215");
+            message.AddRepeatedBytes(ToBytes("216"));
+
+            message.AddRepeatedGroup(TestAllTypes.Types.RepeatedGroup.CreateBuilder().SetA(217).Build());
+            message.AddRepeatedNestedMessage(TestAllTypes.Types.NestedMessage.CreateBuilder().SetBb(218).Build());
+            message.AddRepeatedForeignMessage(ForeignMessage.CreateBuilder().SetC(219).Build());
+            message.AddRepeatedImportMessage(ImportMessage.CreateBuilder().SetD(220).Build());
+
+            message.AddRepeatedNestedEnum(TestAllTypes.Types.NestedEnum.BAR);
+            message.AddRepeatedForeignEnum(ForeignEnum.FOREIGN_BAR);
+            message.AddRepeatedImportEnum(ImportEnum.IMPORT_BAR);
+
+            message.AddRepeatedStringPiece("224");
+            message.AddRepeatedCord("225");
+
+            // Add a second one of each field.
+            message.AddRepeatedInt32(301);
+            message.AddRepeatedInt64(302);
+            message.AddRepeatedUint32(303);
+            message.AddRepeatedUint64(304);
+            message.AddRepeatedSint32(305);
+            message.AddRepeatedSint64(306);
+            message.AddRepeatedFixed32(307);
+            message.AddRepeatedFixed64(308);
+            message.AddRepeatedSfixed32(309);
+            message.AddRepeatedSfixed64(310);
+            message.AddRepeatedFloat(311);
+            message.AddRepeatedDouble(312);
+            message.AddRepeatedBool(false);
+            message.AddRepeatedString("315");
+            message.AddRepeatedBytes(ToBytes("316"));
+
+            message.AddRepeatedGroup(TestAllTypes.Types.RepeatedGroup.CreateBuilder().SetA(317).Build());
+            message.AddRepeatedNestedMessage(TestAllTypes.Types.NestedMessage.CreateBuilder().SetBb(318).Build());
+            message.AddRepeatedForeignMessage(ForeignMessage.CreateBuilder().SetC(319).Build());
+            message.AddRepeatedImportMessage(ImportMessage.CreateBuilder().SetD(320).Build());
+
+            message.AddRepeatedNestedEnum(TestAllTypes.Types.NestedEnum.BAZ);
+            message.AddRepeatedForeignEnum(ForeignEnum.FOREIGN_BAZ);
+            message.AddRepeatedImportEnum(ImportEnum.IMPORT_BAZ);
+
+            message.AddRepeatedStringPiece("324");
+            message.AddRepeatedCord("325");
+
+            // -----------------------------------------------------------------
+
+            message.SetDefaultInt32(401);
+            message.SetDefaultInt64(402);
+            message.SetDefaultUint32(403);
+            message.SetDefaultUint64(404);
+            message.SetDefaultSint32(405);
+            message.SetDefaultSint64(406);
+            message.SetDefaultFixed32(407);
+            message.SetDefaultFixed64(408);
+            message.SetDefaultSfixed32(409);
+            message.SetDefaultSfixed64(410);
+            message.SetDefaultFloat(411);
+            message.SetDefaultDouble(412);
+            message.SetDefaultBool(false);
+            message.SetDefaultString("415");
+            message.SetDefaultBytes(ToBytes("416"));
+
+            message.SetDefaultNestedEnum(TestAllTypes.Types.NestedEnum.FOO);
+            message.SetDefaultForeignEnum(ForeignEnum.FOREIGN_FOO);
+            message.SetDefaultImportEnum(ImportEnum.IMPORT_FOO);
+
+            message.SetDefaultStringPiece("424");
+            message.SetDefaultCord("425");
+        }
+
+        /// <summary>
+        /// Asserts that all fields of the specified message are set to the values
+        /// assigned by SetAllFields.
+        /// </summary>
+        internal static void AssertAllFieldsSet(TestAllTypes message)
+        {
+            Assert.IsTrue(message.HasOptionalInt32);
+            Assert.IsTrue(message.HasOptionalInt64);
+            Assert.IsTrue(message.HasOptionalUint32);
+            Assert.IsTrue(message.HasOptionalUint64);
+            Assert.IsTrue(message.HasOptionalSint32);
+            Assert.IsTrue(message.HasOptionalSint64);
+            Assert.IsTrue(message.HasOptionalFixed32);
+            Assert.IsTrue(message.HasOptionalFixed64);
+            Assert.IsTrue(message.HasOptionalSfixed32);
+            Assert.IsTrue(message.HasOptionalSfixed64);
+            Assert.IsTrue(message.HasOptionalFloat);
+            Assert.IsTrue(message.HasOptionalDouble);
+            Assert.IsTrue(message.HasOptionalBool);
+            Assert.IsTrue(message.HasOptionalString);
+            Assert.IsTrue(message.HasOptionalBytes);
+
+            Assert.IsTrue(message.HasOptionalGroup);
+            Assert.IsTrue(message.HasOptionalNestedMessage);
+            Assert.IsTrue(message.HasOptionalForeignMessage);
+            Assert.IsTrue(message.HasOptionalImportMessage);
+
+            Assert.IsTrue(message.OptionalGroup.HasA);
+            Assert.IsTrue(message.OptionalNestedMessage.HasBb);
+            Assert.IsTrue(message.OptionalForeignMessage.HasC);
+            Assert.IsTrue(message.OptionalImportMessage.HasD);
+
+            Assert.IsTrue(message.HasOptionalNestedEnum);
+            Assert.IsTrue(message.HasOptionalForeignEnum);
+            Assert.IsTrue(message.HasOptionalImportEnum);
+
+            Assert.IsTrue(message.HasOptionalStringPiece);
+            Assert.IsTrue(message.HasOptionalCord);
+
+            Assert.AreEqual(101, message.OptionalInt32);
+            Assert.AreEqual(102, message.OptionalInt64);
+            Assert.AreEqual(103u, message.OptionalUint32);
+            Assert.AreEqual(104u, message.OptionalUint64);
+            Assert.AreEqual(105, message.OptionalSint32);
+            Assert.AreEqual(106, message.OptionalSint64);
+            Assert.AreEqual(107u, message.OptionalFixed32);
+            Assert.AreEqual(108u, message.OptionalFixed64);
+            Assert.AreEqual(109, message.OptionalSfixed32);
+            Assert.AreEqual(110, message.OptionalSfixed64);
+            Assert.AreEqual(111, message.OptionalFloat);
+            Assert.AreEqual(112, message.OptionalDouble);
+            Assert.AreEqual(true, message.OptionalBool);
+            Assert.AreEqual("115", message.OptionalString);
+            Assert.AreEqual(ToBytes("116"), message.OptionalBytes);
+
+            Assert.AreEqual(117, message.OptionalGroup.A);
+            Assert.AreEqual(118, message.OptionalNestedMessage.Bb);
+            Assert.AreEqual(119, message.OptionalForeignMessage.C);
+            Assert.AreEqual(120, message.OptionalImportMessage.D);
+
+            Assert.AreEqual(TestAllTypes.Types.NestedEnum.BAZ, message.OptionalNestedEnum);
+            Assert.AreEqual(ForeignEnum.FOREIGN_BAZ, message.OptionalForeignEnum);
+            Assert.AreEqual(ImportEnum.IMPORT_BAZ, message.OptionalImportEnum);
+
+            Assert.AreEqual("124", message.OptionalStringPiece);
+            Assert.AreEqual("125", message.OptionalCord);
+
+            // -----------------------------------------------------------------
+
+            Assert.AreEqual(2, message.RepeatedInt32Count);
+            Assert.AreEqual(2, message.RepeatedInt64Count);
+            Assert.AreEqual(2, message.RepeatedUint32Count);
+            Assert.AreEqual(2, message.RepeatedUint64Count);
+            Assert.AreEqual(2, message.RepeatedSint32Count);
+            Assert.AreEqual(2, message.RepeatedSint64Count);
+            Assert.AreEqual(2, message.RepeatedFixed32Count);
+            Assert.AreEqual(2, message.RepeatedFixed64Count);
+            Assert.AreEqual(2, message.RepeatedSfixed32Count);
+            Assert.AreEqual(2, message.RepeatedSfixed64Count);
+            Assert.AreEqual(2, message.RepeatedFloatCount);
+            Assert.AreEqual(2, message.RepeatedDoubleCount);
+            Assert.AreEqual(2, message.RepeatedBoolCount);
+            Assert.AreEqual(2, message.RepeatedStringCount);
+            Assert.AreEqual(2, message.RepeatedBytesCount);
+
+            Assert.AreEqual(2, message.RepeatedGroupCount);
+            Assert.AreEqual(2, message.RepeatedNestedMessageCount);
+            Assert.AreEqual(2, message.RepeatedForeignMessageCount);
+            Assert.AreEqual(2, message.RepeatedImportMessageCount);
+            Assert.AreEqual(2, message.RepeatedNestedEnumCount);
+            Assert.AreEqual(2, message.RepeatedForeignEnumCount);
+            Assert.AreEqual(2, message.RepeatedImportEnumCount);
+
+            Assert.AreEqual(2, message.RepeatedStringPieceCount);
+            Assert.AreEqual(2, message.RepeatedCordCount);
+
+            Assert.AreEqual(201, message.GetRepeatedInt32(0));
+            Assert.AreEqual(202, message.GetRepeatedInt64(0));
+            Assert.AreEqual(203u, message.GetRepeatedUint32(0));
+            Assert.AreEqual(204u, message.GetRepeatedUint64(0));
+            Assert.AreEqual(205, message.GetRepeatedSint32(0));
+            Assert.AreEqual(206, message.GetRepeatedSint64(0));
+            Assert.AreEqual(207u, message.GetRepeatedFixed32(0));
+            Assert.AreEqual(208u, message.GetRepeatedFixed64(0));
+            Assert.AreEqual(209, message.GetRepeatedSfixed32(0));
+            Assert.AreEqual(210, message.GetRepeatedSfixed64(0));
+            Assert.AreEqual(211, message.GetRepeatedFloat(0));
+            Assert.AreEqual(212, message.GetRepeatedDouble(0));
+            Assert.AreEqual(true, message.GetRepeatedBool(0));
+            Assert.AreEqual("215", message.GetRepeatedString(0));
+            Assert.AreEqual(ToBytes("216"), message.GetRepeatedBytes(0));
+
+            Assert.AreEqual(217, message.GetRepeatedGroup(0).A);
+            Assert.AreEqual(218, message.GetRepeatedNestedMessage(0).Bb);
+            Assert.AreEqual(219, message.GetRepeatedForeignMessage(0).C);
+            Assert.AreEqual(220, message.GetRepeatedImportMessage(0).D);
+
+            Assert.AreEqual(TestAllTypes.Types.NestedEnum.BAR, message.GetRepeatedNestedEnum(0));
+            Assert.AreEqual(ForeignEnum.FOREIGN_BAR, message.GetRepeatedForeignEnum(0));
+            Assert.AreEqual(ImportEnum.IMPORT_BAR, message.GetRepeatedImportEnum(0));
+
+            Assert.AreEqual("224", message.GetRepeatedStringPiece(0));
+            Assert.AreEqual("225", message.GetRepeatedCord(0));
+
+            Assert.AreEqual(301, message.GetRepeatedInt32(1));
+            Assert.AreEqual(302, message.GetRepeatedInt64(1));
+            Assert.AreEqual(303u, message.GetRepeatedUint32(1));
+            Assert.AreEqual(304u, message.GetRepeatedUint64(1));
+            Assert.AreEqual(305, message.GetRepeatedSint32(1));
+            Assert.AreEqual(306, message.GetRepeatedSint64(1));
+            Assert.AreEqual(307u, message.GetRepeatedFixed32(1));
+            Assert.AreEqual(308u, message.GetRepeatedFixed64(1));
+            Assert.AreEqual(309, message.GetRepeatedSfixed32(1));
+            Assert.AreEqual(310, message.GetRepeatedSfixed64(1));
+            Assert.AreEqual(311, message.GetRepeatedFloat(1), 0.0);
+            Assert.AreEqual(312, message.GetRepeatedDouble(1), 0.0);
+            Assert.AreEqual(false, message.GetRepeatedBool(1));
+            Assert.AreEqual("315", message.GetRepeatedString(1));
+            Assert.AreEqual(ToBytes("316"), message.GetRepeatedBytes(1));
+
+            Assert.AreEqual(317, message.GetRepeatedGroup(1).A);
+            Assert.AreEqual(318, message.GetRepeatedNestedMessage(1).Bb);
+            Assert.AreEqual(319, message.GetRepeatedForeignMessage(1).C);
+            Assert.AreEqual(320, message.GetRepeatedImportMessage(1).D);
+
+            Assert.AreEqual(TestAllTypes.Types.NestedEnum.BAZ, message.GetRepeatedNestedEnum(1));
+            Assert.AreEqual(ForeignEnum.FOREIGN_BAZ, message.GetRepeatedForeignEnum(1));
+            Assert.AreEqual(ImportEnum.IMPORT_BAZ, message.GetRepeatedImportEnum(1));
+
+            Assert.AreEqual("324", message.GetRepeatedStringPiece(1));
+            Assert.AreEqual("325", message.GetRepeatedCord(1));
+
+            // -----------------------------------------------------------------
+
+            Assert.IsTrue(message.HasDefaultInt32);
+            Assert.IsTrue(message.HasDefaultInt64);
+            Assert.IsTrue(message.HasDefaultUint32);
+            Assert.IsTrue(message.HasDefaultUint64);
+            Assert.IsTrue(message.HasDefaultSint32);
+            Assert.IsTrue(message.HasDefaultSint64);
+            Assert.IsTrue(message.HasDefaultFixed32);
+            Assert.IsTrue(message.HasDefaultFixed64);
+            Assert.IsTrue(message.HasDefaultSfixed32);
+            Assert.IsTrue(message.HasDefaultSfixed64);
+            Assert.IsTrue(message.HasDefaultFloat);
+            Assert.IsTrue(message.HasDefaultDouble);
+            Assert.IsTrue(message.HasDefaultBool);
+            Assert.IsTrue(message.HasDefaultString);
+            Assert.IsTrue(message.HasDefaultBytes);
+
+            Assert.IsTrue(message.HasDefaultNestedEnum);
+            Assert.IsTrue(message.HasDefaultForeignEnum);
+            Assert.IsTrue(message.HasDefaultImportEnum);
+
+            Assert.IsTrue(message.HasDefaultStringPiece);
+            Assert.IsTrue(message.HasDefaultCord);
+
+            Assert.AreEqual(401, message.DefaultInt32);
+            Assert.AreEqual(402, message.DefaultInt64);
+            Assert.AreEqual(403u, message.DefaultUint32);
+            Assert.AreEqual(404u, message.DefaultUint64);
+            Assert.AreEqual(405, message.DefaultSint32);
+            Assert.AreEqual(406, message.DefaultSint64);
+            Assert.AreEqual(407u, message.DefaultFixed32);
+            Assert.AreEqual(408u, message.DefaultFixed64);
+            Assert.AreEqual(409, message.DefaultSfixed32);
+            Assert.AreEqual(410, message.DefaultSfixed64);
+            Assert.AreEqual(411, message.DefaultFloat);
+            Assert.AreEqual(412, message.DefaultDouble);
+            Assert.AreEqual(false, message.DefaultBool);
+            Assert.AreEqual("415", message.DefaultString);
+            Assert.AreEqual(ToBytes("416"), message.DefaultBytes);
+
+            Assert.AreEqual(TestAllTypes.Types.NestedEnum.FOO, message.DefaultNestedEnum);
+            Assert.AreEqual(ForeignEnum.FOREIGN_FOO, message.DefaultForeignEnum);
+            Assert.AreEqual(ImportEnum.IMPORT_FOO, message.DefaultImportEnum);
+
+            Assert.AreEqual("424", message.DefaultStringPiece);
+            Assert.AreEqual("425", message.DefaultCord);
+        }
+
+        internal static void AssertClear(TestAllTypes message)
+        {
+            // HasBlah() should initially be false for all optional fields.
+            Assert.IsFalse(message.HasOptionalInt32);
+            Assert.IsFalse(message.HasOptionalInt64);
+            Assert.IsFalse(message.HasOptionalUint32);
+            Assert.IsFalse(message.HasOptionalUint64);
+            Assert.IsFalse(message.HasOptionalSint32);
+            Assert.IsFalse(message.HasOptionalSint64);
+            Assert.IsFalse(message.HasOptionalFixed32);
+            Assert.IsFalse(message.HasOptionalFixed64);
+            Assert.IsFalse(message.HasOptionalSfixed32);
+            Assert.IsFalse(message.HasOptionalSfixed64);
+            Assert.IsFalse(message.HasOptionalFloat);
+            Assert.IsFalse(message.HasOptionalDouble);
+            Assert.IsFalse(message.HasOptionalBool);
+            Assert.IsFalse(message.HasOptionalString);
+            Assert.IsFalse(message.HasOptionalBytes);
+
+            Assert.IsFalse(message.HasOptionalGroup);
+            Assert.IsFalse(message.HasOptionalNestedMessage);
+            Assert.IsFalse(message.HasOptionalForeignMessage);
+            Assert.IsFalse(message.HasOptionalImportMessage);
+
+            Assert.IsFalse(message.HasOptionalNestedEnum);
+            Assert.IsFalse(message.HasOptionalForeignEnum);
+            Assert.IsFalse(message.HasOptionalImportEnum);
+
+            Assert.IsFalse(message.HasOptionalStringPiece);
+            Assert.IsFalse(message.HasOptionalCord);
+
+            // Optional fields without defaults are set to zero or something like it.
+            Assert.AreEqual(0, message.OptionalInt32);
+            Assert.AreEqual(0, message.OptionalInt64);
+            Assert.AreEqual(0u, message.OptionalUint32);
+            Assert.AreEqual(0u, message.OptionalUint64);
+            Assert.AreEqual(0, message.OptionalSint32);
+            Assert.AreEqual(0, message.OptionalSint64);
+            Assert.AreEqual(0u, message.OptionalFixed32);
+            Assert.AreEqual(0u, message.OptionalFixed64);
+            Assert.AreEqual(0, message.OptionalSfixed32);
+            Assert.AreEqual(0, message.OptionalSfixed64);
+            Assert.AreEqual(0, message.OptionalFloat);
+            Assert.AreEqual(0, message.OptionalDouble);
+            Assert.AreEqual(false, message.OptionalBool);
+            Assert.AreEqual("", message.OptionalString);
+            Assert.AreEqual(ByteString.Empty, message.OptionalBytes);
+
+            // Embedded messages should also be clear.
+            Assert.IsFalse(message.OptionalGroup.HasA);
+            Assert.IsFalse(message.OptionalNestedMessage.HasBb);
+            Assert.IsFalse(message.OptionalForeignMessage.HasC);
+            Assert.IsFalse(message.OptionalImportMessage.HasD);
+
+            Assert.AreEqual(0, message.OptionalGroup.A);
+            Assert.AreEqual(0, message.OptionalNestedMessage.Bb);
+            Assert.AreEqual(0, message.OptionalForeignMessage.C);
+            Assert.AreEqual(0, message.OptionalImportMessage.D);
+
+            // Enums without defaults are set to the first value in the enum.
+            Assert.AreEqual(TestAllTypes.Types.NestedEnum.FOO, message.OptionalNestedEnum);
+            Assert.AreEqual(ForeignEnum.FOREIGN_FOO, message.OptionalForeignEnum);
+            Assert.AreEqual(ImportEnum.IMPORT_FOO, message.OptionalImportEnum);
+
+            Assert.AreEqual("", message.OptionalStringPiece);
+            Assert.AreEqual("", message.OptionalCord);
+
+            // Repeated fields are empty.
+            Assert.AreEqual(0, message.RepeatedInt32Count);
+            Assert.AreEqual(0, message.RepeatedInt64Count);
+            Assert.AreEqual(0, message.RepeatedUint32Count);
+            Assert.AreEqual(0, message.RepeatedUint64Count);
+            Assert.AreEqual(0, message.RepeatedSint32Count);
+            Assert.AreEqual(0, message.RepeatedSint64Count);
+            Assert.AreEqual(0, message.RepeatedFixed32Count);
+            Assert.AreEqual(0, message.RepeatedFixed64Count);
+            Assert.AreEqual(0, message.RepeatedSfixed32Count);
+            Assert.AreEqual(0, message.RepeatedSfixed64Count);
+            Assert.AreEqual(0, message.RepeatedFloatCount);
+            Assert.AreEqual(0, message.RepeatedDoubleCount);
+            Assert.AreEqual(0, message.RepeatedBoolCount);
+            Assert.AreEqual(0, message.RepeatedStringCount);
+            Assert.AreEqual(0, message.RepeatedBytesCount);
+
+            Assert.AreEqual(0, message.RepeatedGroupCount);
+            Assert.AreEqual(0, message.RepeatedNestedMessageCount);
+            Assert.AreEqual(0, message.RepeatedForeignMessageCount);
+            Assert.AreEqual(0, message.RepeatedImportMessageCount);
+            Assert.AreEqual(0, message.RepeatedNestedEnumCount);
+            Assert.AreEqual(0, message.RepeatedForeignEnumCount);
+            Assert.AreEqual(0, message.RepeatedImportEnumCount);
+
+            Assert.AreEqual(0, message.RepeatedStringPieceCount);
+            Assert.AreEqual(0, message.RepeatedCordCount);
+
+            // HasBlah() should also be false for all default fields.
+            Assert.IsFalse(message.HasDefaultInt32);
+            Assert.IsFalse(message.HasDefaultInt64);
+            Assert.IsFalse(message.HasDefaultUint32);
+            Assert.IsFalse(message.HasDefaultUint64);
+            Assert.IsFalse(message.HasDefaultSint32);
+            Assert.IsFalse(message.HasDefaultSint64);
+            Assert.IsFalse(message.HasDefaultFixed32);
+            Assert.IsFalse(message.HasDefaultFixed64);
+            Assert.IsFalse(message.HasDefaultSfixed32);
+            Assert.IsFalse(message.HasDefaultSfixed64);
+            Assert.IsFalse(message.HasDefaultFloat);
+            Assert.IsFalse(message.HasDefaultDouble);
+            Assert.IsFalse(message.HasDefaultBool);
+            Assert.IsFalse(message.HasDefaultString);
+            Assert.IsFalse(message.HasDefaultBytes);
+
+            Assert.IsFalse(message.HasDefaultNestedEnum);
+            Assert.IsFalse(message.HasDefaultForeignEnum);
+            Assert.IsFalse(message.HasDefaultImportEnum);
+
+            Assert.IsFalse(message.HasDefaultStringPiece);
+            Assert.IsFalse(message.HasDefaultCord);
+
+            // Fields with defaults have their default values (duh).
+            Assert.AreEqual(41, message.DefaultInt32);
+            Assert.AreEqual(42, message.DefaultInt64);
+            Assert.AreEqual(43u, message.DefaultUint32);
+            Assert.AreEqual(44u, message.DefaultUint64);
+            Assert.AreEqual(-45, message.DefaultSint32);
+            Assert.AreEqual(46, message.DefaultSint64);
+            Assert.AreEqual(47u, message.DefaultFixed32);
+            Assert.AreEqual(48u, message.DefaultFixed64);
+            Assert.AreEqual(49, message.DefaultSfixed32);
+            Assert.AreEqual(-50, message.DefaultSfixed64);
+            Assert.AreEqual(51.5, message.DefaultFloat, 0.0);
+            Assert.AreEqual(52e3, message.DefaultDouble, 0.0);
+            Assert.AreEqual(true, message.DefaultBool);
+            Assert.AreEqual("hello", message.DefaultString);
+            Assert.AreEqual(ToBytes("world"), message.DefaultBytes);
+
+            Assert.AreEqual(TestAllTypes.Types.NestedEnum.BAR, message.DefaultNestedEnum);
+            Assert.AreEqual(ForeignEnum.FOREIGN_BAR, message.DefaultForeignEnum);
+            Assert.AreEqual(ImportEnum.IMPORT_BAR, message.DefaultImportEnum);
+
+            Assert.AreEqual("abc", message.DefaultStringPiece);
+            Assert.AreEqual("123", message.DefaultCord);
+        }
+
+        /// <summary>
+        /// Get a TestAllExtensions with all fields set as they would be by
+        /// SetAllExtensions(TestAllExtensions.Builder).
+        /// </summary>
+        internal static TestAllExtensions GetAllExtensionsSet()
+        {
+            TestAllExtensions.Builder builder = TestAllExtensions.CreateBuilder();
+            SetAllExtensions(builder);
+            return builder.Build();
+        }
+
+        public static TestPackedTypes GetPackedSet()
+        {
+            TestPackedTypes.Builder builder = TestPackedTypes.CreateBuilder();
+            SetPackedFields(builder);
+            return builder.Build();
+        }
+
+        public static TestPackedExtensions GetPackedExtensionsSet()
+        {
+            TestPackedExtensions.Builder builder = TestPackedExtensions.CreateBuilder();
+            SetPackedExtensions(builder);
+            return builder.Build();
+        }
+
+        /// <summary>
+        /// Sets every field of the specified builder to the values expected by
+        /// AssertAllExtensionsSet.
+        /// </summary>
+        internal static void SetAllExtensions(TestAllExtensions.Builder message)
+        {
+            message.SetExtension(UnitTestProtoFile.OptionalInt32Extension, 101);
+            message.SetExtension(UnitTestProtoFile.OptionalInt64Extension, 102L);
+            message.SetExtension(UnitTestProtoFile.OptionalUint32Extension, 103U);
+            message.SetExtension(UnitTestProtoFile.OptionalUint64Extension, 104UL);
+            message.SetExtension(UnitTestProtoFile.OptionalSint32Extension, 105);
+            message.SetExtension(UnitTestProtoFile.OptionalSint64Extension, 106L);
+            message.SetExtension(UnitTestProtoFile.OptionalFixed32Extension, 107U);
+            message.SetExtension(UnitTestProtoFile.OptionalFixed64Extension, 108UL);
+            message.SetExtension(UnitTestProtoFile.OptionalSfixed32Extension, 109);
+            message.SetExtension(UnitTestProtoFile.OptionalSfixed64Extension, 110L);
+            message.SetExtension(UnitTestProtoFile.OptionalFloatExtension, 111F);
+            message.SetExtension(UnitTestProtoFile.OptionalDoubleExtension, 112D);
+            message.SetExtension(UnitTestProtoFile.OptionalBoolExtension, true);
+            message.SetExtension(UnitTestProtoFile.OptionalStringExtension, "115");
+            message.SetExtension(UnitTestProtoFile.OptionalBytesExtension, ToBytes("116"));
+
+            message.SetExtension(UnitTestProtoFile.OptionalGroupExtension,
+                                 OptionalGroup_extension.CreateBuilder().SetA(117).Build());
+            message.SetExtension(UnitTestProtoFile.OptionalNestedMessageExtension,
+                                 TestAllTypes.Types.NestedMessage.CreateBuilder().SetBb(118).Build());
+            message.SetExtension(UnitTestProtoFile.OptionalForeignMessageExtension,
+                                 ForeignMessage.CreateBuilder().SetC(119).Build());
+            message.SetExtension(UnitTestProtoFile.OptionalImportMessageExtension,
+                                 ImportMessage.CreateBuilder().SetD(120).Build());
+
+            message.SetExtension(UnitTestProtoFile.OptionalNestedEnumExtension, TestAllTypes.Types.NestedEnum.BAZ);
+            message.SetExtension(UnitTestProtoFile.OptionalForeignEnumExtension, ForeignEnum.FOREIGN_BAZ);
+            message.SetExtension(UnitTestProtoFile.OptionalImportEnumExtension, ImportEnum.IMPORT_BAZ);
+
+            message.SetExtension(UnitTestProtoFile.OptionalStringPieceExtension, "124");
+            message.SetExtension(UnitTestProtoFile.OptionalCordExtension, "125");
+
+            // -----------------------------------------------------------------
+
+            message.AddExtension(UnitTestProtoFile.RepeatedInt32Extension, 201);
+            message.AddExtension(UnitTestProtoFile.RepeatedInt64Extension, 202L);
+            message.AddExtension(UnitTestProtoFile.RepeatedUint32Extension, 203U);
+            message.AddExtension(UnitTestProtoFile.RepeatedUint64Extension, 204UL);
+            message.AddExtension(UnitTestProtoFile.RepeatedSint32Extension, 205);
+            message.AddExtension(UnitTestProtoFile.RepeatedSint64Extension, 206L);
+            message.AddExtension(UnitTestProtoFile.RepeatedFixed32Extension, 207U);
+            message.AddExtension(UnitTestProtoFile.RepeatedFixed64Extension, 208UL);
+            message.AddExtension(UnitTestProtoFile.RepeatedSfixed32Extension, 209);
+            message.AddExtension(UnitTestProtoFile.RepeatedSfixed64Extension, 210L);
+            message.AddExtension(UnitTestProtoFile.RepeatedFloatExtension, 211F);
+            message.AddExtension(UnitTestProtoFile.RepeatedDoubleExtension, 212D);
+            message.AddExtension(UnitTestProtoFile.RepeatedBoolExtension, true);
+            message.AddExtension(UnitTestProtoFile.RepeatedStringExtension, "215");
+            message.AddExtension(UnitTestProtoFile.RepeatedBytesExtension, ToBytes("216"));
+
+            message.AddExtension(UnitTestProtoFile.RepeatedGroupExtension,
+                                 RepeatedGroup_extension.CreateBuilder().SetA(217).Build());
+            message.AddExtension(UnitTestProtoFile.RepeatedNestedMessageExtension,
+                                 TestAllTypes.Types.NestedMessage.CreateBuilder().SetBb(218).Build());
+            message.AddExtension(UnitTestProtoFile.RepeatedForeignMessageExtension,
+                                 ForeignMessage.CreateBuilder().SetC(219).Build());
+            message.AddExtension(UnitTestProtoFile.RepeatedImportMessageExtension,
+                                 ImportMessage.CreateBuilder().SetD(220).Build());
+
+            message.AddExtension(UnitTestProtoFile.RepeatedNestedEnumExtension, TestAllTypes.Types.NestedEnum.BAR);
+            message.AddExtension(UnitTestProtoFile.RepeatedForeignEnumExtension, ForeignEnum.FOREIGN_BAR);
+            message.AddExtension(UnitTestProtoFile.RepeatedImportEnumExtension, ImportEnum.IMPORT_BAR);
+
+            message.AddExtension(UnitTestProtoFile.RepeatedStringPieceExtension, "224");
+            message.AddExtension(UnitTestProtoFile.RepeatedCordExtension, "225");
+
+            // Add a second one of each field.
+            message.AddExtension(UnitTestProtoFile.RepeatedInt32Extension, 301);
+            message.AddExtension(UnitTestProtoFile.RepeatedInt64Extension, 302L);
+            message.AddExtension(UnitTestProtoFile.RepeatedUint32Extension, 303U);
+            message.AddExtension(UnitTestProtoFile.RepeatedUint64Extension, 304UL);
+            message.AddExtension(UnitTestProtoFile.RepeatedSint32Extension, 305);
+            message.AddExtension(UnitTestProtoFile.RepeatedSint64Extension, 306L);
+            message.AddExtension(UnitTestProtoFile.RepeatedFixed32Extension, 307U);
+            message.AddExtension(UnitTestProtoFile.RepeatedFixed64Extension, 308UL);
+            message.AddExtension(UnitTestProtoFile.RepeatedSfixed32Extension, 309);
+            message.AddExtension(UnitTestProtoFile.RepeatedSfixed64Extension, 310L);
+            message.AddExtension(UnitTestProtoFile.RepeatedFloatExtension, 311F);
+            message.AddExtension(UnitTestProtoFile.RepeatedDoubleExtension, 312D);
+            message.AddExtension(UnitTestProtoFile.RepeatedBoolExtension, false);
+            message.AddExtension(UnitTestProtoFile.RepeatedStringExtension, "315");
+            message.AddExtension(UnitTestProtoFile.RepeatedBytesExtension, ToBytes("316"));
+
+            message.AddExtension(UnitTestProtoFile.RepeatedGroupExtension,
+                                 RepeatedGroup_extension.CreateBuilder().SetA(317).Build());
+            message.AddExtension(UnitTestProtoFile.RepeatedNestedMessageExtension,
+                                 TestAllTypes.Types.NestedMessage.CreateBuilder().SetBb(318).Build());
+            message.AddExtension(UnitTestProtoFile.RepeatedForeignMessageExtension,
+                                 ForeignMessage.CreateBuilder().SetC(319).Build());
+            message.AddExtension(UnitTestProtoFile.RepeatedImportMessageExtension,
+                                 ImportMessage.CreateBuilder().SetD(320).Build());
+
+            message.AddExtension(UnitTestProtoFile.RepeatedNestedEnumExtension, TestAllTypes.Types.NestedEnum.BAZ);
+            message.AddExtension(UnitTestProtoFile.RepeatedForeignEnumExtension, ForeignEnum.FOREIGN_BAZ);
+            message.AddExtension(UnitTestProtoFile.RepeatedImportEnumExtension, ImportEnum.IMPORT_BAZ);
+
+            message.AddExtension(UnitTestProtoFile.RepeatedStringPieceExtension, "324");
+            message.AddExtension(UnitTestProtoFile.RepeatedCordExtension, "325");
+
+            // -----------------------------------------------------------------
+
+            message.SetExtension(UnitTestProtoFile.DefaultInt32Extension, 401);
+            message.SetExtension(UnitTestProtoFile.DefaultInt64Extension, 402L);
+            message.SetExtension(UnitTestProtoFile.DefaultUint32Extension, 403U);
+            message.SetExtension(UnitTestProtoFile.DefaultUint64Extension, 404UL);
+            message.SetExtension(UnitTestProtoFile.DefaultSint32Extension, 405);
+            message.SetExtension(UnitTestProtoFile.DefaultSint64Extension, 406L);
+            message.SetExtension(UnitTestProtoFile.DefaultFixed32Extension, 407U);
+            message.SetExtension(UnitTestProtoFile.DefaultFixed64Extension, 408UL);
+            message.SetExtension(UnitTestProtoFile.DefaultSfixed32Extension, 409);
+            message.SetExtension(UnitTestProtoFile.DefaultSfixed64Extension, 410L);
+            message.SetExtension(UnitTestProtoFile.DefaultFloatExtension, 411F);
+            message.SetExtension(UnitTestProtoFile.DefaultDoubleExtension, 412D);
+            message.SetExtension(UnitTestProtoFile.DefaultBoolExtension, false);
+            message.SetExtension(UnitTestProtoFile.DefaultStringExtension, "415");
+            message.SetExtension(UnitTestProtoFile.DefaultBytesExtension, ToBytes("416"));
+
+            message.SetExtension(UnitTestProtoFile.DefaultNestedEnumExtension, TestAllTypes.Types.NestedEnum.FOO);
+            message.SetExtension(UnitTestProtoFile.DefaultForeignEnumExtension, ForeignEnum.FOREIGN_FOO);
+            message.SetExtension(UnitTestProtoFile.DefaultImportEnumExtension, ImportEnum.IMPORT_FOO);
+
+            message.SetExtension(UnitTestProtoFile.DefaultStringPieceExtension, "424");
+            message.SetExtension(UnitTestProtoFile.DefaultCordExtension, "425");
+        }
+
+        internal static void ModifyRepeatedFields(TestAllTypes.Builder message)
+        {
+            message.SetRepeatedInt32(1, 501);
+            message.SetRepeatedInt64(1, 502);
+            message.SetRepeatedUint32(1, 503);
+            message.SetRepeatedUint64(1, 504);
+            message.SetRepeatedSint32(1, 505);
+            message.SetRepeatedSint64(1, 506);
+            message.SetRepeatedFixed32(1, 507);
+            message.SetRepeatedFixed64(1, 508);
+            message.SetRepeatedSfixed32(1, 509);
+            message.SetRepeatedSfixed64(1, 510);
+            message.SetRepeatedFloat(1, 511);
+            message.SetRepeatedDouble(1, 512);
+            message.SetRepeatedBool(1, true);
+            message.SetRepeatedString(1, "515");
+            message.SetRepeatedBytes(1, ToBytes("516"));
+
+            message.SetRepeatedGroup(1, TestAllTypes.Types.RepeatedGroup.CreateBuilder().SetA(517).Build());
+            message.SetRepeatedNestedMessage(1, TestAllTypes.Types.NestedMessage.CreateBuilder().SetBb(518).Build());
+            message.SetRepeatedForeignMessage(1, ForeignMessage.CreateBuilder().SetC(519).Build());
+            message.SetRepeatedImportMessage(1, ImportMessage.CreateBuilder().SetD(520).Build());
+
+            message.SetRepeatedNestedEnum(1, TestAllTypes.Types.NestedEnum.FOO);
+            message.SetRepeatedForeignEnum(1, ForeignEnum.FOREIGN_FOO);
+            message.SetRepeatedImportEnum(1, ImportEnum.IMPORT_FOO);
+
+            message.SetRepeatedStringPiece(1, "524");
+            message.SetRepeatedCord(1, "525");
+        }
+
+        internal static void AssertRepeatedFieldsModified(TestAllTypes message)
+        {
+            // ModifyRepeatedFields only sets the second repeated element of each
+            // field.  In addition to verifying this, we also verify that the first
+            // element and size were *not* modified.
+            Assert.AreEqual(2, message.RepeatedInt32Count);
+            Assert.AreEqual(2, message.RepeatedInt64Count);
+            Assert.AreEqual(2, message.RepeatedUint32Count);
+            Assert.AreEqual(2, message.RepeatedUint64Count);
+            Assert.AreEqual(2, message.RepeatedSint32Count);
+            Assert.AreEqual(2, message.RepeatedSint64Count);
+            Assert.AreEqual(2, message.RepeatedFixed32Count);
+            Assert.AreEqual(2, message.RepeatedFixed64Count);
+            Assert.AreEqual(2, message.RepeatedSfixed32Count);
+            Assert.AreEqual(2, message.RepeatedSfixed64Count);
+            Assert.AreEqual(2, message.RepeatedFloatCount);
+            Assert.AreEqual(2, message.RepeatedDoubleCount);
+            Assert.AreEqual(2, message.RepeatedBoolCount);
+            Assert.AreEqual(2, message.RepeatedStringCount);
+            Assert.AreEqual(2, message.RepeatedBytesCount);
+
+            Assert.AreEqual(2, message.RepeatedGroupCount);
+            Assert.AreEqual(2, message.RepeatedNestedMessageCount);
+            Assert.AreEqual(2, message.RepeatedForeignMessageCount);
+            Assert.AreEqual(2, message.RepeatedImportMessageCount);
+            Assert.AreEqual(2, message.RepeatedNestedEnumCount);
+            Assert.AreEqual(2, message.RepeatedForeignEnumCount);
+            Assert.AreEqual(2, message.RepeatedImportEnumCount);
+
+            Assert.AreEqual(2, message.RepeatedStringPieceCount);
+            Assert.AreEqual(2, message.RepeatedCordCount);
+
+            Assert.AreEqual(201, message.GetRepeatedInt32(0));
+            Assert.AreEqual(202L, message.GetRepeatedInt64(0));
+            Assert.AreEqual(203U, message.GetRepeatedUint32(0));
+            Assert.AreEqual(204UL, message.GetRepeatedUint64(0));
+            Assert.AreEqual(205, message.GetRepeatedSint32(0));
+            Assert.AreEqual(206L, message.GetRepeatedSint64(0));
+            Assert.AreEqual(207U, message.GetRepeatedFixed32(0));
+            Assert.AreEqual(208UL, message.GetRepeatedFixed64(0));
+            Assert.AreEqual(209, message.GetRepeatedSfixed32(0));
+            Assert.AreEqual(210L, message.GetRepeatedSfixed64(0));
+            Assert.AreEqual(211F, message.GetRepeatedFloat(0));
+            Assert.AreEqual(212D, message.GetRepeatedDouble(0));
+            Assert.AreEqual(true, message.GetRepeatedBool(0));
+            Assert.AreEqual("215", message.GetRepeatedString(0));
+            Assert.AreEqual(ToBytes("216"), message.GetRepeatedBytes(0));
+
+            Assert.AreEqual(217, message.GetRepeatedGroup(0).A);
+            Assert.AreEqual(218, message.GetRepeatedNestedMessage(0).Bb);
+            Assert.AreEqual(219, message.GetRepeatedForeignMessage(0).C);
+            Assert.AreEqual(220, message.GetRepeatedImportMessage(0).D);
+
+            Assert.AreEqual(TestAllTypes.Types.NestedEnum.BAR, message.GetRepeatedNestedEnum(0));
+            Assert.AreEqual(ForeignEnum.FOREIGN_BAR, message.GetRepeatedForeignEnum(0));
+            Assert.AreEqual(ImportEnum.IMPORT_BAR, message.GetRepeatedImportEnum(0));
+
+            Assert.AreEqual("224", message.GetRepeatedStringPiece(0));
+            Assert.AreEqual("225", message.GetRepeatedCord(0));
+
+            // Actually verify the second (modified) elements now.
+            Assert.AreEqual(501, message.GetRepeatedInt32(1));
+            Assert.AreEqual(502L, message.GetRepeatedInt64(1));
+            Assert.AreEqual(503U, message.GetRepeatedUint32(1));
+            Assert.AreEqual(504UL, message.GetRepeatedUint64(1));
+            Assert.AreEqual(505, message.GetRepeatedSint32(1));
+            Assert.AreEqual(506L, message.GetRepeatedSint64(1));
+            Assert.AreEqual(507U, message.GetRepeatedFixed32(1));
+            Assert.AreEqual(508UL, message.GetRepeatedFixed64(1));
+            Assert.AreEqual(509, message.GetRepeatedSfixed32(1));
+            Assert.AreEqual(510L, message.GetRepeatedSfixed64(1));
+            Assert.AreEqual(511F, message.GetRepeatedFloat(1));
+            Assert.AreEqual(512D, message.GetRepeatedDouble(1));
+            Assert.AreEqual(true, message.GetRepeatedBool(1));
+            Assert.AreEqual("515", message.GetRepeatedString(1));
+            Assert.AreEqual(ToBytes("516"), message.GetRepeatedBytes(1));
+
+            Assert.AreEqual(517, message.GetRepeatedGroup(1).A);
+            Assert.AreEqual(518, message.GetRepeatedNestedMessage(1).Bb);
+            Assert.AreEqual(519, message.GetRepeatedForeignMessage(1).C);
+            Assert.AreEqual(520, message.GetRepeatedImportMessage(1).D);
+
+            Assert.AreEqual(TestAllTypes.Types.NestedEnum.FOO, message.GetRepeatedNestedEnum(1));
+            Assert.AreEqual(ForeignEnum.FOREIGN_FOO, message.GetRepeatedForeignEnum(1));
+            Assert.AreEqual(ImportEnum.IMPORT_FOO, message.GetRepeatedImportEnum(1));
+
+            Assert.AreEqual("524", message.GetRepeatedStringPiece(1));
+            Assert.AreEqual("525", message.GetRepeatedCord(1));
+        }
+
+        /// <summary>
+        /// Helper to assert that sequences are equal.
+        /// </summary>
+        internal static void AssertEqual<T>(IEnumerable<T> first, IEnumerable<T> second)
+        {
+            using (IEnumerator<T> firstEnumerator = first.GetEnumerator())
+            {
+                foreach (T secondElement in second)
+                {
+                    Assert.IsTrue(firstEnumerator.MoveNext(), "First enumerator ran out of elements too early.");
+                    Assert.AreEqual(firstEnumerator.Current, secondElement);
+                }
+                Assert.IsFalse(firstEnumerator.MoveNext(), "Second enumerator ran out of elements too early.");
+            }
+        }
+
+        internal static void AssertEqualBytes(byte[] expected, byte[] actual)
+        {
+            Assert.AreEqual(ByteString.CopyFrom(expected), ByteString.CopyFrom(actual));
+        }
+
+        internal static void AssertAllExtensionsSet(TestAllExtensions message)
+        {
+            Assert.IsTrue(message.HasExtension(UnitTestProtoFile.OptionalInt32Extension));
+            Assert.IsTrue(message.HasExtension(UnitTestProtoFile.OptionalInt64Extension));
+            Assert.IsTrue(message.HasExtension(UnitTestProtoFile.OptionalUint32Extension));
+            Assert.IsTrue(message.HasExtension(UnitTestProtoFile.OptionalUint64Extension));
+            Assert.IsTrue(message.HasExtension(UnitTestProtoFile.OptionalSint32Extension));
+            Assert.IsTrue(message.HasExtension(UnitTestProtoFile.OptionalSint64Extension));
+            Assert.IsTrue(message.HasExtension(UnitTestProtoFile.OptionalFixed32Extension));
+            Assert.IsTrue(message.HasExtension(UnitTestProtoFile.OptionalFixed64Extension));
+            Assert.IsTrue(message.HasExtension(UnitTestProtoFile.OptionalSfixed32Extension));
+            Assert.IsTrue(message.HasExtension(UnitTestProtoFile.OptionalSfixed64Extension));
+            Assert.IsTrue(message.HasExtension(UnitTestProtoFile.OptionalFloatExtension));
+            Assert.IsTrue(message.HasExtension(UnitTestProtoFile.OptionalDoubleExtension));
+            Assert.IsTrue(message.HasExtension(UnitTestProtoFile.OptionalBoolExtension));
+            Assert.IsTrue(message.HasExtension(UnitTestProtoFile.OptionalStringExtension));
+            Assert.IsTrue(message.HasExtension(UnitTestProtoFile.OptionalBytesExtension));
+
+            Assert.IsTrue(message.HasExtension(UnitTestProtoFile.OptionalGroupExtension));
+            Assert.IsTrue(message.HasExtension(UnitTestProtoFile.OptionalNestedMessageExtension));
+            Assert.IsTrue(message.HasExtension(UnitTestProtoFile.OptionalForeignMessageExtension));
+            Assert.IsTrue(message.HasExtension(UnitTestProtoFile.OptionalImportMessageExtension));
+
+            Assert.IsTrue(message.GetExtension(UnitTestProtoFile.OptionalGroupExtension).HasA);
+            Assert.IsTrue(message.GetExtension(UnitTestProtoFile.OptionalNestedMessageExtension).HasBb);
+            Assert.IsTrue(message.GetExtension(UnitTestProtoFile.OptionalForeignMessageExtension).HasC);
+            Assert.IsTrue(message.GetExtension(UnitTestProtoFile.OptionalImportMessageExtension).HasD);
+
+            Assert.IsTrue(message.HasExtension(UnitTestProtoFile.OptionalNestedEnumExtension));
+            Assert.IsTrue(message.HasExtension(UnitTestProtoFile.OptionalForeignEnumExtension));
+            Assert.IsTrue(message.HasExtension(UnitTestProtoFile.OptionalImportEnumExtension));
+
+            Assert.IsTrue(message.HasExtension(UnitTestProtoFile.OptionalStringPieceExtension));
+            Assert.IsTrue(message.HasExtension(UnitTestProtoFile.OptionalCordExtension));
+
+            Assert.AreEqual(101, message.GetExtension(UnitTestProtoFile.OptionalInt32Extension));
+            Assert.AreEqual(102L, message.GetExtension(UnitTestProtoFile.OptionalInt64Extension));
+            Assert.AreEqual(103U, message.GetExtension(UnitTestProtoFile.OptionalUint32Extension));
+            Assert.AreEqual(104UL, message.GetExtension(UnitTestProtoFile.OptionalUint64Extension));
+            Assert.AreEqual(105, message.GetExtension(UnitTestProtoFile.OptionalSint32Extension));
+            Assert.AreEqual(106L, message.GetExtension(UnitTestProtoFile.OptionalSint64Extension));
+            Assert.AreEqual(107U, message.GetExtension(UnitTestProtoFile.OptionalFixed32Extension));
+            Assert.AreEqual(108UL, message.GetExtension(UnitTestProtoFile.OptionalFixed64Extension));
+            Assert.AreEqual(109, message.GetExtension(UnitTestProtoFile.OptionalSfixed32Extension));
+            Assert.AreEqual(110L, message.GetExtension(UnitTestProtoFile.OptionalSfixed64Extension));
+            Assert.AreEqual(111F, message.GetExtension(UnitTestProtoFile.OptionalFloatExtension));
+            Assert.AreEqual(112D, message.GetExtension(UnitTestProtoFile.OptionalDoubleExtension));
+            Assert.AreEqual(true, message.GetExtension(UnitTestProtoFile.OptionalBoolExtension));
+            Assert.AreEqual("115", message.GetExtension(UnitTestProtoFile.OptionalStringExtension));
+            Assert.AreEqual(ToBytes("116"), message.GetExtension(UnitTestProtoFile.OptionalBytesExtension));
+
+            Assert.AreEqual(117, message.GetExtension(UnitTestProtoFile.OptionalGroupExtension).A);
+            Assert.AreEqual(118, message.GetExtension(UnitTestProtoFile.OptionalNestedMessageExtension).Bb);
+            Assert.AreEqual(119, message.GetExtension(UnitTestProtoFile.OptionalForeignMessageExtension).C);
+            Assert.AreEqual(120, message.GetExtension(UnitTestProtoFile.OptionalImportMessageExtension).D);
+
+            Assert.AreEqual(TestAllTypes.Types.NestedEnum.BAZ,
+                            message.GetExtension(UnitTestProtoFile.OptionalNestedEnumExtension));
+            Assert.AreEqual(ForeignEnum.FOREIGN_BAZ,
+                            message.GetExtension(UnitTestProtoFile.OptionalForeignEnumExtension));
+            Assert.AreEqual(ImportEnum.IMPORT_BAZ, message.GetExtension(UnitTestProtoFile.OptionalImportEnumExtension));
+
+            Assert.AreEqual("124", message.GetExtension(UnitTestProtoFile.OptionalStringPieceExtension));
+            Assert.AreEqual("125", message.GetExtension(UnitTestProtoFile.OptionalCordExtension));
+
+            // -----------------------------------------------------------------
+
+            Assert.AreEqual(2, message.GetExtensionCount(UnitTestProtoFile.RepeatedInt32Extension));
+            Assert.AreEqual(2, message.GetExtensionCount(UnitTestProtoFile.RepeatedInt64Extension));
+            Assert.AreEqual(2, message.GetExtensionCount(UnitTestProtoFile.RepeatedUint32Extension));
+            Assert.AreEqual(2, message.GetExtensionCount(UnitTestProtoFile.RepeatedUint64Extension));
+            Assert.AreEqual(2, message.GetExtensionCount(UnitTestProtoFile.RepeatedSint32Extension));
+            Assert.AreEqual(2, message.GetExtensionCount(UnitTestProtoFile.RepeatedSint64Extension));
+            Assert.AreEqual(2, message.GetExtensionCount(UnitTestProtoFile.RepeatedFixed32Extension));
+            Assert.AreEqual(2, message.GetExtensionCount(UnitTestProtoFile.RepeatedFixed64Extension));
+            Assert.AreEqual(2, message.GetExtensionCount(UnitTestProtoFile.RepeatedSfixed32Extension));
+            Assert.AreEqual(2, message.GetExtensionCount(UnitTestProtoFile.RepeatedSfixed64Extension));
+            Assert.AreEqual(2, message.GetExtensionCount(UnitTestProtoFile.RepeatedFloatExtension));
+            Assert.AreEqual(2, message.GetExtensionCount(UnitTestProtoFile.RepeatedDoubleExtension));
+            Assert.AreEqual(2, message.GetExtensionCount(UnitTestProtoFile.RepeatedBoolExtension));
+            Assert.AreEqual(2, message.GetExtensionCount(UnitTestProtoFile.RepeatedStringExtension));
+            Assert.AreEqual(2, message.GetExtensionCount(UnitTestProtoFile.RepeatedBytesExtension));
+
+            Assert.AreEqual(2, message.GetExtensionCount(UnitTestProtoFile.RepeatedGroupExtension));
+            Assert.AreEqual(2, message.GetExtensionCount(UnitTestProtoFile.RepeatedNestedMessageExtension));
+            Assert.AreEqual(2, message.GetExtensionCount(UnitTestProtoFile.RepeatedForeignMessageExtension));
+            Assert.AreEqual(2, message.GetExtensionCount(UnitTestProtoFile.RepeatedImportMessageExtension));
+            Assert.AreEqual(2, message.GetExtensionCount(UnitTestProtoFile.RepeatedNestedEnumExtension));
+            Assert.AreEqual(2, message.GetExtensionCount(UnitTestProtoFile.RepeatedForeignEnumExtension));
+            Assert.AreEqual(2, message.GetExtensionCount(UnitTestProtoFile.RepeatedImportEnumExtension));
+
+            Assert.AreEqual(2, message.GetExtensionCount(UnitTestProtoFile.RepeatedStringPieceExtension));
+            Assert.AreEqual(2, message.GetExtensionCount(UnitTestProtoFile.RepeatedCordExtension));
+
+            Assert.AreEqual(201, message.GetExtension(UnitTestProtoFile.RepeatedInt32Extension, 0));
+            Assert.AreEqual(202L, message.GetExtension(UnitTestProtoFile.RepeatedInt64Extension, 0));
+            Assert.AreEqual(203U, message.GetExtension(UnitTestProtoFile.RepeatedUint32Extension, 0));
+            Assert.AreEqual(204UL, message.GetExtension(UnitTestProtoFile.RepeatedUint64Extension, 0));
+            Assert.AreEqual(205, message.GetExtension(UnitTestProtoFile.RepeatedSint32Extension, 0));
+            Assert.AreEqual(206L, message.GetExtension(UnitTestProtoFile.RepeatedSint64Extension, 0));
+            Assert.AreEqual(207U, message.GetExtension(UnitTestProtoFile.RepeatedFixed32Extension, 0));
+            Assert.AreEqual(208UL, message.GetExtension(UnitTestProtoFile.RepeatedFixed64Extension, 0));
+            Assert.AreEqual(209, message.GetExtension(UnitTestProtoFile.RepeatedSfixed32Extension, 0));
+            Assert.AreEqual(210L, message.GetExtension(UnitTestProtoFile.RepeatedSfixed64Extension, 0));
+            Assert.AreEqual(211F, message.GetExtension(UnitTestProtoFile.RepeatedFloatExtension, 0));
+            Assert.AreEqual(212D, message.GetExtension(UnitTestProtoFile.RepeatedDoubleExtension, 0));
+            Assert.AreEqual(true, message.GetExtension(UnitTestProtoFile.RepeatedBoolExtension, 0));
+            Assert.AreEqual("215", message.GetExtension(UnitTestProtoFile.RepeatedStringExtension, 0));
+            Assert.AreEqual(ToBytes("216"), message.GetExtension(UnitTestProtoFile.RepeatedBytesExtension, 0));
+
+            Assert.AreEqual(217, message.GetExtension(UnitTestProtoFile.RepeatedGroupExtension, 0).A);
+            Assert.AreEqual(218, message.GetExtension(UnitTestProtoFile.RepeatedNestedMessageExtension, 0).Bb);
+            Assert.AreEqual(219, message.GetExtension(UnitTestProtoFile.RepeatedForeignMessageExtension, 0).C);
+            Assert.AreEqual(220, message.GetExtension(UnitTestProtoFile.RepeatedImportMessageExtension, 0).D);
+
+            Assert.AreEqual(TestAllTypes.Types.NestedEnum.BAR,
+                            message.GetExtension(UnitTestProtoFile.RepeatedNestedEnumExtension, 0));
+            Assert.AreEqual(ForeignEnum.FOREIGN_BAR,
+                            message.GetExtension(UnitTestProtoFile.RepeatedForeignEnumExtension, 0));
+            Assert.AreEqual(ImportEnum.IMPORT_BAR,
+                            message.GetExtension(UnitTestProtoFile.RepeatedImportEnumExtension, 0));
+
+            Assert.AreEqual("224", message.GetExtension(UnitTestProtoFile.RepeatedStringPieceExtension, 0));
+            Assert.AreEqual("225", message.GetExtension(UnitTestProtoFile.RepeatedCordExtension, 0));
+
+            Assert.AreEqual(301, message.GetExtension(UnitTestProtoFile.RepeatedInt32Extension, 1));
+            Assert.AreEqual(302L, message.GetExtension(UnitTestProtoFile.RepeatedInt64Extension, 1));
+            Assert.AreEqual(303U, message.GetExtension(UnitTestProtoFile.RepeatedUint32Extension, 1));
+            Assert.AreEqual(304UL, message.GetExtension(UnitTestProtoFile.RepeatedUint64Extension, 1));
+            Assert.AreEqual(305, message.GetExtension(UnitTestProtoFile.RepeatedSint32Extension, 1));
+            Assert.AreEqual(306L, message.GetExtension(UnitTestProtoFile.RepeatedSint64Extension, 1));
+            Assert.AreEqual(307U, message.GetExtension(UnitTestProtoFile.RepeatedFixed32Extension, 1));
+            Assert.AreEqual(308UL, message.GetExtension(UnitTestProtoFile.RepeatedFixed64Extension, 1));
+            Assert.AreEqual(309, message.GetExtension(UnitTestProtoFile.RepeatedSfixed32Extension, 1));
+            Assert.AreEqual(310L, message.GetExtension(UnitTestProtoFile.RepeatedSfixed64Extension, 1));
+            Assert.AreEqual(311F, message.GetExtension(UnitTestProtoFile.RepeatedFloatExtension, 1));
+            Assert.AreEqual(312D, message.GetExtension(UnitTestProtoFile.RepeatedDoubleExtension, 1));
+            Assert.AreEqual(false, message.GetExtension(UnitTestProtoFile.RepeatedBoolExtension, 1));
+            Assert.AreEqual("315", message.GetExtension(UnitTestProtoFile.RepeatedStringExtension, 1));
+            Assert.AreEqual(ToBytes("316"), message.GetExtension(UnitTestProtoFile.RepeatedBytesExtension, 1));
+
+            Assert.AreEqual(317, message.GetExtension(UnitTestProtoFile.RepeatedGroupExtension, 1).A);
+            Assert.AreEqual(318, message.GetExtension(UnitTestProtoFile.RepeatedNestedMessageExtension, 1).Bb);
+            Assert.AreEqual(319, message.GetExtension(UnitTestProtoFile.RepeatedForeignMessageExtension, 1).C);
+            Assert.AreEqual(320, message.GetExtension(UnitTestProtoFile.RepeatedImportMessageExtension, 1).D);
+
+            Assert.AreEqual(TestAllTypes.Types.NestedEnum.BAZ,
+                            message.GetExtension(UnitTestProtoFile.RepeatedNestedEnumExtension, 1));
+            Assert.AreEqual(ForeignEnum.FOREIGN_BAZ,
+                            message.GetExtension(UnitTestProtoFile.RepeatedForeignEnumExtension, 1));
+            Assert.AreEqual(ImportEnum.IMPORT_BAZ,
+                            message.GetExtension(UnitTestProtoFile.RepeatedImportEnumExtension, 1));
+
+            Assert.AreEqual("324", message.GetExtension(UnitTestProtoFile.RepeatedStringPieceExtension, 1));
+            Assert.AreEqual("325", message.GetExtension(UnitTestProtoFile.RepeatedCordExtension, 1));
+
+            // -----------------------------------------------------------------
+
+            Assert.IsTrue(message.HasExtension(UnitTestProtoFile.DefaultInt32Extension));
+            Assert.IsTrue(message.HasExtension(UnitTestProtoFile.DefaultInt64Extension));
+            Assert.IsTrue(message.HasExtension(UnitTestProtoFile.DefaultUint32Extension));
+            Assert.IsTrue(message.HasExtension(UnitTestProtoFile.DefaultUint64Extension));
+            Assert.IsTrue(message.HasExtension(UnitTestProtoFile.DefaultSint32Extension));
+            Assert.IsTrue(message.HasExtension(UnitTestProtoFile.DefaultSint64Extension));
+            Assert.IsTrue(message.HasExtension(UnitTestProtoFile.DefaultFixed32Extension));
+            Assert.IsTrue(message.HasExtension(UnitTestProtoFile.DefaultFixed64Extension));
+            Assert.IsTrue(message.HasExtension(UnitTestProtoFile.DefaultSfixed32Extension));
+            Assert.IsTrue(message.HasExtension(UnitTestProtoFile.DefaultSfixed64Extension));
+            Assert.IsTrue(message.HasExtension(UnitTestProtoFile.DefaultFloatExtension));
+            Assert.IsTrue(message.HasExtension(UnitTestProtoFile.DefaultDoubleExtension));
+            Assert.IsTrue(message.HasExtension(UnitTestProtoFile.DefaultBoolExtension));
+            Assert.IsTrue(message.HasExtension(UnitTestProtoFile.DefaultStringExtension));
+            Assert.IsTrue(message.HasExtension(UnitTestProtoFile.DefaultBytesExtension));
+
+            Assert.IsTrue(message.HasExtension(UnitTestProtoFile.DefaultNestedEnumExtension));
+            Assert.IsTrue(message.HasExtension(UnitTestProtoFile.DefaultForeignEnumExtension));
+            Assert.IsTrue(message.HasExtension(UnitTestProtoFile.DefaultImportEnumExtension));
+
+            Assert.IsTrue(message.HasExtension(UnitTestProtoFile.DefaultStringPieceExtension));
+            Assert.IsTrue(message.HasExtension(UnitTestProtoFile.DefaultCordExtension));
+
+            Assert.AreEqual(401, message.GetExtension(UnitTestProtoFile.DefaultInt32Extension));
+            Assert.AreEqual(402L, message.GetExtension(UnitTestProtoFile.DefaultInt64Extension));
+            Assert.AreEqual(403U, message.GetExtension(UnitTestProtoFile.DefaultUint32Extension));
+            Assert.AreEqual(404UL, message.GetExtension(UnitTestProtoFile.DefaultUint64Extension));
+            Assert.AreEqual(405, message.GetExtension(UnitTestProtoFile.DefaultSint32Extension));
+            Assert.AreEqual(406L, message.GetExtension(UnitTestProtoFile.DefaultSint64Extension));
+            Assert.AreEqual(407U, message.GetExtension(UnitTestProtoFile.DefaultFixed32Extension));
+            Assert.AreEqual(408UL, message.GetExtension(UnitTestProtoFile.DefaultFixed64Extension));
+            Assert.AreEqual(409, message.GetExtension(UnitTestProtoFile.DefaultSfixed32Extension));
+            Assert.AreEqual(410L, message.GetExtension(UnitTestProtoFile.DefaultSfixed64Extension));
+            Assert.AreEqual(411F, message.GetExtension(UnitTestProtoFile.DefaultFloatExtension));
+            Assert.AreEqual(412D, message.GetExtension(UnitTestProtoFile.DefaultDoubleExtension));
+            Assert.AreEqual(false, message.GetExtension(UnitTestProtoFile.DefaultBoolExtension));
+            Assert.AreEqual("415", message.GetExtension(UnitTestProtoFile.DefaultStringExtension));
+            Assert.AreEqual(ToBytes("416"), message.GetExtension(UnitTestProtoFile.DefaultBytesExtension));
+
+            Assert.AreEqual(TestAllTypes.Types.NestedEnum.FOO,
+                            message.GetExtension(UnitTestProtoFile.DefaultNestedEnumExtension));
+            Assert.AreEqual(ForeignEnum.FOREIGN_FOO, message.GetExtension(UnitTestProtoFile.DefaultForeignEnumExtension));
+            Assert.AreEqual(ImportEnum.IMPORT_FOO, message.GetExtension(UnitTestProtoFile.DefaultImportEnumExtension));
+
+            Assert.AreEqual("424", message.GetExtension(UnitTestProtoFile.DefaultStringPieceExtension));
+            Assert.AreEqual("425", message.GetExtension(UnitTestProtoFile.DefaultCordExtension));
+        }
+
+        /// <summary>
+        /// Modifies the repeated extensions of the given message to contain the values
+        /// expected by AssertRepeatedExtensionsModified.
+        /// </summary>
+        internal static void ModifyRepeatedExtensions(TestAllExtensions.Builder message)
+        {
+            message.SetExtension(UnitTestProtoFile.RepeatedInt32Extension, 1, 501);
+            message.SetExtension(UnitTestProtoFile.RepeatedInt64Extension, 1, 502L);
+            message.SetExtension(UnitTestProtoFile.RepeatedUint32Extension, 1, 503U);
+            message.SetExtension(UnitTestProtoFile.RepeatedUint64Extension, 1, 504UL);
+            message.SetExtension(UnitTestProtoFile.RepeatedSint32Extension, 1, 505);
+            message.SetExtension(UnitTestProtoFile.RepeatedSint64Extension, 1, 506L);
+            message.SetExtension(UnitTestProtoFile.RepeatedFixed32Extension, 1, 507U);
+            message.SetExtension(UnitTestProtoFile.RepeatedFixed64Extension, 1, 508UL);
+            message.SetExtension(UnitTestProtoFile.RepeatedSfixed32Extension, 1, 509);
+            message.SetExtension(UnitTestProtoFile.RepeatedSfixed64Extension, 1, 510L);
+            message.SetExtension(UnitTestProtoFile.RepeatedFloatExtension, 1, 511F);
+            message.SetExtension(UnitTestProtoFile.RepeatedDoubleExtension, 1, 512D);
+            message.SetExtension(UnitTestProtoFile.RepeatedBoolExtension, 1, true);
+            message.SetExtension(UnitTestProtoFile.RepeatedStringExtension, 1, "515");
+            message.SetExtension(UnitTestProtoFile.RepeatedBytesExtension, 1, ToBytes("516"));
+
+            message.SetExtension(UnitTestProtoFile.RepeatedGroupExtension, 1,
+                                 RepeatedGroup_extension.CreateBuilder().SetA(517).Build());
+            message.SetExtension(UnitTestProtoFile.RepeatedNestedMessageExtension, 1,
+                                 TestAllTypes.Types.NestedMessage.CreateBuilder().SetBb(518).Build());
+            message.SetExtension(UnitTestProtoFile.RepeatedForeignMessageExtension, 1,
+                                 ForeignMessage.CreateBuilder().SetC(519).Build());
+            message.SetExtension(UnitTestProtoFile.RepeatedImportMessageExtension, 1,
+                                 ImportMessage.CreateBuilder().SetD(520).Build());
+
+            message.SetExtension(UnitTestProtoFile.RepeatedNestedEnumExtension, 1, TestAllTypes.Types.NestedEnum.FOO);
+            message.SetExtension(UnitTestProtoFile.RepeatedForeignEnumExtension, 1, ForeignEnum.FOREIGN_FOO);
+            message.SetExtension(UnitTestProtoFile.RepeatedImportEnumExtension, 1, ImportEnum.IMPORT_FOO);
+
+            message.SetExtension(UnitTestProtoFile.RepeatedStringPieceExtension, 1, "524");
+            message.SetExtension(UnitTestProtoFile.RepeatedCordExtension, 1, "525");
+        }
+
+        /// <summary>
+        /// Asserts that all repeated extensions are set to the values assigned by
+        /// SetAllExtensions follwed by ModifyRepeatedExtensions.
+        /// </summary>
+        internal static void AssertRepeatedExtensionsModified(TestAllExtensions message)
+        {
+            // ModifyRepeatedFields only sets the second repeated element of each
+            // field.  In addition to verifying this, we also verify that the first
+            // element and size were *not* modified.
+            Assert.AreEqual(2, message.GetExtensionCount(UnitTestProtoFile.RepeatedInt32Extension));
+            Assert.AreEqual(2, message.GetExtensionCount(UnitTestProtoFile.RepeatedInt64Extension));
+            Assert.AreEqual(2, message.GetExtensionCount(UnitTestProtoFile.RepeatedUint32Extension));
+            Assert.AreEqual(2, message.GetExtensionCount(UnitTestProtoFile.RepeatedUint64Extension));
+            Assert.AreEqual(2, message.GetExtensionCount(UnitTestProtoFile.RepeatedSint32Extension));
+            Assert.AreEqual(2, message.GetExtensionCount(UnitTestProtoFile.RepeatedSint64Extension));
+            Assert.AreEqual(2, message.GetExtensionCount(UnitTestProtoFile.RepeatedFixed32Extension));
+            Assert.AreEqual(2, message.GetExtensionCount(UnitTestProtoFile.RepeatedFixed64Extension));
+            Assert.AreEqual(2, message.GetExtensionCount(UnitTestProtoFile.RepeatedSfixed32Extension));
+            Assert.AreEqual(2, message.GetExtensionCount(UnitTestProtoFile.RepeatedSfixed64Extension));
+            Assert.AreEqual(2, message.GetExtensionCount(UnitTestProtoFile.RepeatedFloatExtension));
+            Assert.AreEqual(2, message.GetExtensionCount(UnitTestProtoFile.RepeatedDoubleExtension));
+            Assert.AreEqual(2, message.GetExtensionCount(UnitTestProtoFile.RepeatedBoolExtension));
+            Assert.AreEqual(2, message.GetExtensionCount(UnitTestProtoFile.RepeatedStringExtension));
+            Assert.AreEqual(2, message.GetExtensionCount(UnitTestProtoFile.RepeatedBytesExtension));
+
+            Assert.AreEqual(2, message.GetExtensionCount(UnitTestProtoFile.RepeatedGroupExtension));
+            Assert.AreEqual(2, message.GetExtensionCount(UnitTestProtoFile.RepeatedNestedMessageExtension));
+            Assert.AreEqual(2, message.GetExtensionCount(UnitTestProtoFile.RepeatedForeignMessageExtension));
+            Assert.AreEqual(2, message.GetExtensionCount(UnitTestProtoFile.RepeatedImportMessageExtension));
+            Assert.AreEqual(2, message.GetExtensionCount(UnitTestProtoFile.RepeatedNestedEnumExtension));
+            Assert.AreEqual(2, message.GetExtensionCount(UnitTestProtoFile.RepeatedForeignEnumExtension));
+            Assert.AreEqual(2, message.GetExtensionCount(UnitTestProtoFile.RepeatedImportEnumExtension));
+
+            Assert.AreEqual(2, message.GetExtensionCount(UnitTestProtoFile.RepeatedStringPieceExtension));
+            Assert.AreEqual(2, message.GetExtensionCount(UnitTestProtoFile.RepeatedCordExtension));
+
+            Assert.AreEqual(201, message.GetExtension(UnitTestProtoFile.RepeatedInt32Extension, 0));
+            Assert.AreEqual(202L, message.GetExtension(UnitTestProtoFile.RepeatedInt64Extension, 0));
+            Assert.AreEqual(203U, message.GetExtension(UnitTestProtoFile.RepeatedUint32Extension, 0));
+            Assert.AreEqual(204UL, message.GetExtension(UnitTestProtoFile.RepeatedUint64Extension, 0));
+            Assert.AreEqual(205, message.GetExtension(UnitTestProtoFile.RepeatedSint32Extension, 0));
+            Assert.AreEqual(206L, message.GetExtension(UnitTestProtoFile.RepeatedSint64Extension, 0));
+            Assert.AreEqual(207U, message.GetExtension(UnitTestProtoFile.RepeatedFixed32Extension, 0));
+            Assert.AreEqual(208UL, message.GetExtension(UnitTestProtoFile.RepeatedFixed64Extension, 0));
+            Assert.AreEqual(209, message.GetExtension(UnitTestProtoFile.RepeatedSfixed32Extension, 0));
+            Assert.AreEqual(210L, message.GetExtension(UnitTestProtoFile.RepeatedSfixed64Extension, 0));
+            Assert.AreEqual(211F, message.GetExtension(UnitTestProtoFile.RepeatedFloatExtension, 0));
+            Assert.AreEqual(212D, message.GetExtension(UnitTestProtoFile.RepeatedDoubleExtension, 0));
+            Assert.AreEqual(true, message.GetExtension(UnitTestProtoFile.RepeatedBoolExtension, 0));
+            Assert.AreEqual("215", message.GetExtension(UnitTestProtoFile.RepeatedStringExtension, 0));
+            Assert.AreEqual(ToBytes("216"), message.GetExtension(UnitTestProtoFile.RepeatedBytesExtension, 0));
+
+            Assert.AreEqual(217, message.GetExtension(UnitTestProtoFile.RepeatedGroupExtension, 0).A);
+            Assert.AreEqual(218, message.GetExtension(UnitTestProtoFile.RepeatedNestedMessageExtension, 0).Bb);
+            Assert.AreEqual(219, message.GetExtension(UnitTestProtoFile.RepeatedForeignMessageExtension, 0).C);
+            Assert.AreEqual(220, message.GetExtension(UnitTestProtoFile.RepeatedImportMessageExtension, 0).D);
+
+            Assert.AreEqual(TestAllTypes.Types.NestedEnum.BAR,
+                            message.GetExtension(UnitTestProtoFile.RepeatedNestedEnumExtension, 0));
+            Assert.AreEqual(ForeignEnum.FOREIGN_BAR,
+                            message.GetExtension(UnitTestProtoFile.RepeatedForeignEnumExtension, 0));
+            Assert.AreEqual(ImportEnum.IMPORT_BAR,
+                            message.GetExtension(UnitTestProtoFile.RepeatedImportEnumExtension, 0));
+
+            Assert.AreEqual("224", message.GetExtension(UnitTestProtoFile.RepeatedStringPieceExtension, 0));
+            Assert.AreEqual("225", message.GetExtension(UnitTestProtoFile.RepeatedCordExtension, 0));
+
+            // Actually verify the second (modified) elements now.
+            Assert.AreEqual(501, message.GetExtension(UnitTestProtoFile.RepeatedInt32Extension, 1));
+            Assert.AreEqual(502L, message.GetExtension(UnitTestProtoFile.RepeatedInt64Extension, 1));
+            Assert.AreEqual(503U, message.GetExtension(UnitTestProtoFile.RepeatedUint32Extension, 1));
+            Assert.AreEqual(504UL, message.GetExtension(UnitTestProtoFile.RepeatedUint64Extension, 1));
+            Assert.AreEqual(505, message.GetExtension(UnitTestProtoFile.RepeatedSint32Extension, 1));
+            Assert.AreEqual(506L, message.GetExtension(UnitTestProtoFile.RepeatedSint64Extension, 1));
+            Assert.AreEqual(507U, message.GetExtension(UnitTestProtoFile.RepeatedFixed32Extension, 1));
+            Assert.AreEqual(508UL, message.GetExtension(UnitTestProtoFile.RepeatedFixed64Extension, 1));
+            Assert.AreEqual(509, message.GetExtension(UnitTestProtoFile.RepeatedSfixed32Extension, 1));
+            Assert.AreEqual(510L, message.GetExtension(UnitTestProtoFile.RepeatedSfixed64Extension, 1));
+            Assert.AreEqual(511F, message.GetExtension(UnitTestProtoFile.RepeatedFloatExtension, 1));
+            Assert.AreEqual(512D, message.GetExtension(UnitTestProtoFile.RepeatedDoubleExtension, 1));
+            Assert.AreEqual(true, message.GetExtension(UnitTestProtoFile.RepeatedBoolExtension, 1));
+            Assert.AreEqual("515", message.GetExtension(UnitTestProtoFile.RepeatedStringExtension, 1));
+            Assert.AreEqual(ToBytes("516"), message.GetExtension(UnitTestProtoFile.RepeatedBytesExtension, 1));
+
+            Assert.AreEqual(517, message.GetExtension(UnitTestProtoFile.RepeatedGroupExtension, 1).A);
+            Assert.AreEqual(518, message.GetExtension(UnitTestProtoFile.RepeatedNestedMessageExtension, 1).Bb);
+            Assert.AreEqual(519, message.GetExtension(UnitTestProtoFile.RepeatedForeignMessageExtension, 1).C);
+            Assert.AreEqual(520, message.GetExtension(UnitTestProtoFile.RepeatedImportMessageExtension, 1).D);
+
+            Assert.AreEqual(TestAllTypes.Types.NestedEnum.FOO,
+                            message.GetExtension(UnitTestProtoFile.RepeatedNestedEnumExtension, 1));
+            Assert.AreEqual(ForeignEnum.FOREIGN_FOO,
+                            message.GetExtension(UnitTestProtoFile.RepeatedForeignEnumExtension, 1));
+            Assert.AreEqual(ImportEnum.IMPORT_FOO,
+                            message.GetExtension(UnitTestProtoFile.RepeatedImportEnumExtension, 1));
+
+            Assert.AreEqual("524", message.GetExtension(UnitTestProtoFile.RepeatedStringPieceExtension, 1));
+            Assert.AreEqual("525", message.GetExtension(UnitTestProtoFile.RepeatedCordExtension, 1));
+        }
+
+        internal static void AssertExtensionsClear(TestAllExtensions message)
+        {
+            // HasBlah() should initially be false for all optional fields.
+            Assert.IsFalse(message.HasExtension(UnitTestProtoFile.OptionalInt32Extension));
+            Assert.IsFalse(message.HasExtension(UnitTestProtoFile.OptionalInt64Extension));
+            Assert.IsFalse(message.HasExtension(UnitTestProtoFile.OptionalUint32Extension));
+            Assert.IsFalse(message.HasExtension(UnitTestProtoFile.OptionalUint64Extension));
+            Assert.IsFalse(message.HasExtension(UnitTestProtoFile.OptionalSint32Extension));
+            Assert.IsFalse(message.HasExtension(UnitTestProtoFile.OptionalSint64Extension));
+            Assert.IsFalse(message.HasExtension(UnitTestProtoFile.OptionalFixed32Extension));
+            Assert.IsFalse(message.HasExtension(UnitTestProtoFile.OptionalFixed64Extension));
+            Assert.IsFalse(message.HasExtension(UnitTestProtoFile.OptionalSfixed32Extension));
+            Assert.IsFalse(message.HasExtension(UnitTestProtoFile.OptionalSfixed64Extension));
+            Assert.IsFalse(message.HasExtension(UnitTestProtoFile.OptionalFloatExtension));
+            Assert.IsFalse(message.HasExtension(UnitTestProtoFile.OptionalDoubleExtension));
+            Assert.IsFalse(message.HasExtension(UnitTestProtoFile.OptionalBoolExtension));
+            Assert.IsFalse(message.HasExtension(UnitTestProtoFile.OptionalStringExtension));
+            Assert.IsFalse(message.HasExtension(UnitTestProtoFile.OptionalBytesExtension));
+
+            Assert.IsFalse(message.HasExtension(UnitTestProtoFile.OptionalGroupExtension));
+            Assert.IsFalse(message.HasExtension(UnitTestProtoFile.OptionalNestedMessageExtension));
+            Assert.IsFalse(message.HasExtension(UnitTestProtoFile.OptionalForeignMessageExtension));
+            Assert.IsFalse(message.HasExtension(UnitTestProtoFile.OptionalImportMessageExtension));
+
+            Assert.IsFalse(message.HasExtension(UnitTestProtoFile.OptionalNestedEnumExtension));
+            Assert.IsFalse(message.HasExtension(UnitTestProtoFile.OptionalForeignEnumExtension));
+            Assert.IsFalse(message.HasExtension(UnitTestProtoFile.OptionalImportEnumExtension));
+
+            Assert.IsFalse(message.HasExtension(UnitTestProtoFile.OptionalStringPieceExtension));
+            Assert.IsFalse(message.HasExtension(UnitTestProtoFile.OptionalCordExtension));
+
+            // Optional fields without defaults are set to zero or something like it.
+            Assert.AreEqual(0, message.GetExtension(UnitTestProtoFile.OptionalInt32Extension));
+            Assert.AreEqual(0L, message.GetExtension(UnitTestProtoFile.OptionalInt64Extension));
+            Assert.AreEqual(0U, message.GetExtension(UnitTestProtoFile.OptionalUint32Extension));
+            Assert.AreEqual(0UL, message.GetExtension(UnitTestProtoFile.OptionalUint64Extension));
+            Assert.AreEqual(0, message.GetExtension(UnitTestProtoFile.OptionalSint32Extension));
+            Assert.AreEqual(0L, message.GetExtension(UnitTestProtoFile.OptionalSint64Extension));
+            Assert.AreEqual(0U, message.GetExtension(UnitTestProtoFile.OptionalFixed32Extension));
+            Assert.AreEqual(0UL, message.GetExtension(UnitTestProtoFile.OptionalFixed64Extension));
+            Assert.AreEqual(0, message.GetExtension(UnitTestProtoFile.OptionalSfixed32Extension));
+            Assert.AreEqual(0L, message.GetExtension(UnitTestProtoFile.OptionalSfixed64Extension));
+            Assert.AreEqual(0F, message.GetExtension(UnitTestProtoFile.OptionalFloatExtension));
+            Assert.AreEqual(0D, message.GetExtension(UnitTestProtoFile.OptionalDoubleExtension));
+            Assert.AreEqual(false, message.GetExtension(UnitTestProtoFile.OptionalBoolExtension));
+            Assert.AreEqual("", message.GetExtension(UnitTestProtoFile.OptionalStringExtension));
+            Assert.AreEqual(ByteString.Empty, message.GetExtension(UnitTestProtoFile.OptionalBytesExtension));
+
+            // Embedded messages should also be clear.
+            Assert.IsFalse(message.GetExtension(UnitTestProtoFile.OptionalGroupExtension).HasA);
+            Assert.IsFalse(message.GetExtension(UnitTestProtoFile.OptionalNestedMessageExtension).HasBb);
+            Assert.IsFalse(message.GetExtension(UnitTestProtoFile.OptionalForeignMessageExtension).HasC);
+            Assert.IsFalse(message.GetExtension(UnitTestProtoFile.OptionalImportMessageExtension).HasD);
+
+            Assert.AreEqual(0, message.GetExtension(UnitTestProtoFile.OptionalGroupExtension).A);
+            Assert.AreEqual(0, message.GetExtension(UnitTestProtoFile.OptionalNestedMessageExtension).Bb);
+            Assert.AreEqual(0, message.GetExtension(UnitTestProtoFile.OptionalForeignMessageExtension).C);
+            Assert.AreEqual(0, message.GetExtension(UnitTestProtoFile.OptionalImportMessageExtension).D);
+
+            // Enums without defaults are set to the first value in the enum.
+            Assert.AreEqual(TestAllTypes.Types.NestedEnum.FOO,
+                            message.GetExtension(UnitTestProtoFile.OptionalNestedEnumExtension));
+            Assert.AreEqual(ForeignEnum.FOREIGN_FOO,
+                            message.GetExtension(UnitTestProtoFile.OptionalForeignEnumExtension));
+            Assert.AreEqual(ImportEnum.IMPORT_FOO, message.GetExtension(UnitTestProtoFile.OptionalImportEnumExtension));
+
+            Assert.AreEqual("", message.GetExtension(UnitTestProtoFile.OptionalStringPieceExtension));
+            Assert.AreEqual("", message.GetExtension(UnitTestProtoFile.OptionalCordExtension));
+
+            // Repeated fields are empty.
+            Assert.AreEqual(0, message.GetExtensionCount(UnitTestProtoFile.RepeatedInt32Extension));
+            Assert.AreEqual(0, message.GetExtensionCount(UnitTestProtoFile.RepeatedInt64Extension));
+            Assert.AreEqual(0, message.GetExtensionCount(UnitTestProtoFile.RepeatedUint32Extension));
+            Assert.AreEqual(0, message.GetExtensionCount(UnitTestProtoFile.RepeatedUint64Extension));
+            Assert.AreEqual(0, message.GetExtensionCount(UnitTestProtoFile.RepeatedSint32Extension));
+            Assert.AreEqual(0, message.GetExtensionCount(UnitTestProtoFile.RepeatedSint64Extension));
+            Assert.AreEqual(0, message.GetExtensionCount(UnitTestProtoFile.RepeatedFixed32Extension));
+            Assert.AreEqual(0, message.GetExtensionCount(UnitTestProtoFile.RepeatedFixed64Extension));
+            Assert.AreEqual(0, message.GetExtensionCount(UnitTestProtoFile.RepeatedSfixed32Extension));
+            Assert.AreEqual(0, message.GetExtensionCount(UnitTestProtoFile.RepeatedSfixed64Extension));
+            Assert.AreEqual(0, message.GetExtensionCount(UnitTestProtoFile.RepeatedFloatExtension));
+            Assert.AreEqual(0, message.GetExtensionCount(UnitTestProtoFile.RepeatedDoubleExtension));
+            Assert.AreEqual(0, message.GetExtensionCount(UnitTestProtoFile.RepeatedBoolExtension));
+            Assert.AreEqual(0, message.GetExtensionCount(UnitTestProtoFile.RepeatedStringExtension));
+            Assert.AreEqual(0, message.GetExtensionCount(UnitTestProtoFile.RepeatedBytesExtension));
+
+            Assert.AreEqual(0, message.GetExtensionCount(UnitTestProtoFile.RepeatedGroupExtension));
+            Assert.AreEqual(0, message.GetExtensionCount(UnitTestProtoFile.RepeatedNestedMessageExtension));
+            Assert.AreEqual(0, message.GetExtensionCount(UnitTestProtoFile.RepeatedForeignMessageExtension));
+            Assert.AreEqual(0, message.GetExtensionCount(UnitTestProtoFile.RepeatedImportMessageExtension));
+            Assert.AreEqual(0, message.GetExtensionCount(UnitTestProtoFile.RepeatedNestedEnumExtension));
+            Assert.AreEqual(0, message.GetExtensionCount(UnitTestProtoFile.RepeatedForeignEnumExtension));
+            Assert.AreEqual(0, message.GetExtensionCount(UnitTestProtoFile.RepeatedImportEnumExtension));
+
+            Assert.AreEqual(0, message.GetExtensionCount(UnitTestProtoFile.RepeatedStringPieceExtension));
+            Assert.AreEqual(0, message.GetExtensionCount(UnitTestProtoFile.RepeatedCordExtension));
+
+            // HasBlah() should also be false for all default fields.
+            Assert.IsFalse(message.HasExtension(UnitTestProtoFile.DefaultInt32Extension));
+            Assert.IsFalse(message.HasExtension(UnitTestProtoFile.DefaultInt64Extension));
+            Assert.IsFalse(message.HasExtension(UnitTestProtoFile.DefaultUint32Extension));
+            Assert.IsFalse(message.HasExtension(UnitTestProtoFile.DefaultUint64Extension));
+            Assert.IsFalse(message.HasExtension(UnitTestProtoFile.DefaultSint32Extension));
+            Assert.IsFalse(message.HasExtension(UnitTestProtoFile.DefaultSint64Extension));
+            Assert.IsFalse(message.HasExtension(UnitTestProtoFile.DefaultFixed32Extension));
+            Assert.IsFalse(message.HasExtension(UnitTestProtoFile.DefaultFixed64Extension));
+            Assert.IsFalse(message.HasExtension(UnitTestProtoFile.DefaultSfixed32Extension));
+            Assert.IsFalse(message.HasExtension(UnitTestProtoFile.DefaultSfixed64Extension));
+            Assert.IsFalse(message.HasExtension(UnitTestProtoFile.DefaultFloatExtension));
+            Assert.IsFalse(message.HasExtension(UnitTestProtoFile.DefaultDoubleExtension));
+            Assert.IsFalse(message.HasExtension(UnitTestProtoFile.DefaultBoolExtension));
+            Assert.IsFalse(message.HasExtension(UnitTestProtoFile.DefaultStringExtension));
+            Assert.IsFalse(message.HasExtension(UnitTestProtoFile.DefaultBytesExtension));
+
+            Assert.IsFalse(message.HasExtension(UnitTestProtoFile.DefaultNestedEnumExtension));
+            Assert.IsFalse(message.HasExtension(UnitTestProtoFile.DefaultForeignEnumExtension));
+            Assert.IsFalse(message.HasExtension(UnitTestProtoFile.DefaultImportEnumExtension));
+
+            Assert.IsFalse(message.HasExtension(UnitTestProtoFile.DefaultStringPieceExtension));
+            Assert.IsFalse(message.HasExtension(UnitTestProtoFile.DefaultCordExtension));
+
+            // Fields with defaults have their default values (duh).
+            Assert.AreEqual(41, message.GetExtension(UnitTestProtoFile.DefaultInt32Extension));
+            Assert.AreEqual(42L, message.GetExtension(UnitTestProtoFile.DefaultInt64Extension));
+            Assert.AreEqual(43U, message.GetExtension(UnitTestProtoFile.DefaultUint32Extension));
+            Assert.AreEqual(44UL, message.GetExtension(UnitTestProtoFile.DefaultUint64Extension));
+            Assert.AreEqual(-45, message.GetExtension(UnitTestProtoFile.DefaultSint32Extension));
+            Assert.AreEqual(46L, message.GetExtension(UnitTestProtoFile.DefaultSint64Extension));
+            Assert.AreEqual(47U, message.GetExtension(UnitTestProtoFile.DefaultFixed32Extension));
+            Assert.AreEqual(48UL, message.GetExtension(UnitTestProtoFile.DefaultFixed64Extension));
+            Assert.AreEqual(49, message.GetExtension(UnitTestProtoFile.DefaultSfixed32Extension));
+            Assert.AreEqual(-50L, message.GetExtension(UnitTestProtoFile.DefaultSfixed64Extension));
+            Assert.AreEqual(51.5F, message.GetExtension(UnitTestProtoFile.DefaultFloatExtension));
+            Assert.AreEqual(52e3D, message.GetExtension(UnitTestProtoFile.DefaultDoubleExtension));
+            Assert.AreEqual(true, message.GetExtension(UnitTestProtoFile.DefaultBoolExtension));
+            Assert.AreEqual("hello", message.GetExtension(UnitTestProtoFile.DefaultStringExtension));
+            Assert.AreEqual(ToBytes("world"), message.GetExtension(UnitTestProtoFile.DefaultBytesExtension));
+
+            Assert.AreEqual(TestAllTypes.Types.NestedEnum.BAR,
+                            message.GetExtension(UnitTestProtoFile.DefaultNestedEnumExtension));
+            Assert.AreEqual(ForeignEnum.FOREIGN_BAR, message.GetExtension(UnitTestProtoFile.DefaultForeignEnumExtension));
+            Assert.AreEqual(ImportEnum.IMPORT_BAR, message.GetExtension(UnitTestProtoFile.DefaultImportEnumExtension));
+
+            Assert.AreEqual("abc", message.GetExtension(UnitTestProtoFile.DefaultStringPieceExtension));
+            Assert.AreEqual("123", message.GetExtension(UnitTestProtoFile.DefaultCordExtension));
+        }
+
+        /// <summary>
+        /// Set every field of the specified message to a unique value.
+        /// </summary>
+        public static void SetPackedFields(TestPackedTypes.Builder message)
+        {
+            message.AddPackedInt32(601);
+            message.AddPackedInt64(602);
+            message.AddPackedUint32(603);
+            message.AddPackedUint64(604);
+            message.AddPackedSint32(605);
+            message.AddPackedSint64(606);
+            message.AddPackedFixed32(607);
+            message.AddPackedFixed64(608);
+            message.AddPackedSfixed32(609);
+            message.AddPackedSfixed64(610);
+            message.AddPackedFloat(611);
+            message.AddPackedDouble(612);
+            message.AddPackedBool(true);
+            message.AddPackedEnum(ForeignEnum.FOREIGN_BAR);
+            // Add a second one of each field.
+            message.AddPackedInt32(701);
+            message.AddPackedInt64(702);
+            message.AddPackedUint32(703);
+            message.AddPackedUint64(704);
+            message.AddPackedSint32(705);
+            message.AddPackedSint64(706);
+            message.AddPackedFixed32(707);
+            message.AddPackedFixed64(708);
+            message.AddPackedSfixed32(709);
+            message.AddPackedSfixed64(710);
+            message.AddPackedFloat(711);
+            message.AddPackedDouble(712);
+            message.AddPackedBool(false);
+            message.AddPackedEnum(ForeignEnum.FOREIGN_BAZ);
+        }
+
+        /// <summary>
+        /// Asserts that all the fields of the specified message are set to the values assigned
+        /// in SetPackedFields.
+        /// </summary>
+        public static void AssertPackedFieldsSet(TestPackedTypes message)
+        {
+            Assert.AreEqual(2, message.PackedInt32Count);
+            Assert.AreEqual(2, message.PackedInt64Count);
+            Assert.AreEqual(2, message.PackedUint32Count);
+            Assert.AreEqual(2, message.PackedUint64Count);
+            Assert.AreEqual(2, message.PackedSint32Count);
+            Assert.AreEqual(2, message.PackedSint64Count);
+            Assert.AreEqual(2, message.PackedFixed32Count);
+            Assert.AreEqual(2, message.PackedFixed64Count);
+            Assert.AreEqual(2, message.PackedSfixed32Count);
+            Assert.AreEqual(2, message.PackedSfixed64Count);
+            Assert.AreEqual(2, message.PackedFloatCount);
+            Assert.AreEqual(2, message.PackedDoubleCount);
+            Assert.AreEqual(2, message.PackedBoolCount);
+            Assert.AreEqual(2, message.PackedEnumCount);
+            Assert.AreEqual(601, message.GetPackedInt32(0));
+            Assert.AreEqual(602, message.GetPackedInt64(0));
+            Assert.AreEqual(603u, message.GetPackedUint32(0));
+            Assert.AreEqual(604u, message.GetPackedUint64(0));
+            Assert.AreEqual(605, message.GetPackedSint32(0));
+            Assert.AreEqual(606, message.GetPackedSint64(0));
+            Assert.AreEqual(607u, message.GetPackedFixed32(0));
+            Assert.AreEqual(608u, message.GetPackedFixed64(0));
+            Assert.AreEqual(609, message.GetPackedSfixed32(0));
+            Assert.AreEqual(610, message.GetPackedSfixed64(0));
+            Assert.AreEqual(611, message.GetPackedFloat(0), 0.0);
+            Assert.AreEqual(612, message.GetPackedDouble(0), 0.0);
+            Assert.AreEqual(true, message.GetPackedBool(0));
+            Assert.AreEqual(ForeignEnum.FOREIGN_BAR, message.GetPackedEnum(0));
+            Assert.AreEqual(701, message.GetPackedInt32(1));
+            Assert.AreEqual(702, message.GetPackedInt64(1));
+            Assert.AreEqual(703u, message.GetPackedUint32(1));
+            Assert.AreEqual(704u, message.GetPackedUint64(1));
+            Assert.AreEqual(705, message.GetPackedSint32(1));
+            Assert.AreEqual(706, message.GetPackedSint64(1));
+            Assert.AreEqual(707u, message.GetPackedFixed32(1));
+            Assert.AreEqual(708u, message.GetPackedFixed64(1));
+            Assert.AreEqual(709, message.GetPackedSfixed32(1));
+            Assert.AreEqual(710, message.GetPackedSfixed64(1));
+            Assert.AreEqual(711, message.GetPackedFloat(1), 0.0);
+            Assert.AreEqual(712, message.GetPackedDouble(1), 0.0);
+            Assert.AreEqual(false, message.GetPackedBool(1));
+            Assert.AreEqual(ForeignEnum.FOREIGN_BAZ, message.GetPackedEnum(1));
+        }
+        /// <summary>
+        /// Asserts that all the fields of the specified message are set to the values assigned
+        /// in SetPackedFields.
+        /// </summary>
+        public static void AssertUnpackedFieldsSet(TestUnpackedTypes message)
+        {
+            Assert.AreEqual(2, message.UnpackedInt32Count);
+            Assert.AreEqual(2, message.UnpackedInt64Count);
+            Assert.AreEqual(2, message.UnpackedUint32Count);
+            Assert.AreEqual(2, message.UnpackedUint64Count);
+            Assert.AreEqual(2, message.UnpackedSint32Count);
+            Assert.AreEqual(2, message.UnpackedSint64Count);
+            Assert.AreEqual(2, message.UnpackedFixed32Count);
+            Assert.AreEqual(2, message.UnpackedFixed64Count);
+            Assert.AreEqual(2, message.UnpackedSfixed32Count);
+            Assert.AreEqual(2, message.UnpackedSfixed64Count);
+            Assert.AreEqual(2, message.UnpackedFloatCount);
+            Assert.AreEqual(2, message.UnpackedDoubleCount);
+            Assert.AreEqual(2, message.UnpackedBoolCount);
+            Assert.AreEqual(2, message.UnpackedEnumCount);
+            Assert.AreEqual(601, message.GetUnpackedInt32(0));
+            Assert.AreEqual(602, message.GetUnpackedInt64(0));
+            Assert.AreEqual(603u, message.GetUnpackedUint32(0));
+            Assert.AreEqual(604u, message.GetUnpackedUint64(0));
+            Assert.AreEqual(605, message.GetUnpackedSint32(0));
+            Assert.AreEqual(606, message.GetUnpackedSint64(0));
+            Assert.AreEqual(607u, message.GetUnpackedFixed32(0));
+            Assert.AreEqual(608u, message.GetUnpackedFixed64(0));
+            Assert.AreEqual(609, message.GetUnpackedSfixed32(0));
+            Assert.AreEqual(610, message.GetUnpackedSfixed64(0));
+            Assert.AreEqual(611, message.GetUnpackedFloat(0), 0.0);
+            Assert.AreEqual(612, message.GetUnpackedDouble(0), 0.0);
+            Assert.AreEqual(true, message.GetUnpackedBool(0));
+            Assert.AreEqual(ForeignEnum.FOREIGN_BAR, message.GetUnpackedEnum(0));
+            Assert.AreEqual(701, message.GetUnpackedInt32(1));
+            Assert.AreEqual(702, message.GetUnpackedInt64(1));
+            Assert.AreEqual(703u, message.GetUnpackedUint32(1));
+            Assert.AreEqual(704u, message.GetUnpackedUint64(1));
+            Assert.AreEqual(705, message.GetUnpackedSint32(1));
+            Assert.AreEqual(706, message.GetUnpackedSint64(1));
+            Assert.AreEqual(707u, message.GetUnpackedFixed32(1));
+            Assert.AreEqual(708u, message.GetUnpackedFixed64(1));
+            Assert.AreEqual(709, message.GetUnpackedSfixed32(1));
+            Assert.AreEqual(710, message.GetUnpackedSfixed64(1));
+            Assert.AreEqual(711, message.GetUnpackedFloat(1), 0.0);
+            Assert.AreEqual(712, message.GetUnpackedDouble(1), 0.0);
+            Assert.AreEqual(false, message.GetUnpackedBool(1));
+            Assert.AreEqual(ForeignEnum.FOREIGN_BAZ, message.GetUnpackedEnum(1));
+        }
+
+        public static void SetPackedExtensions(TestPackedExtensions.Builder message)
+        {
+            message.AddExtension(UnitTestProtoFile.PackedInt32Extension, 601);
+            message.AddExtension(UnitTestProtoFile.PackedInt64Extension, 602L);
+            message.AddExtension(UnitTestProtoFile.PackedUint32Extension, 603U);
+            message.AddExtension(UnitTestProtoFile.PackedUint64Extension, 604UL);
+            message.AddExtension(UnitTestProtoFile.PackedSint32Extension, 605);
+            message.AddExtension(UnitTestProtoFile.PackedSint64Extension, 606L);
+            message.AddExtension(UnitTestProtoFile.PackedFixed32Extension, 607U);
+            message.AddExtension(UnitTestProtoFile.PackedFixed64Extension, 608UL);
+            message.AddExtension(UnitTestProtoFile.PackedSfixed32Extension, 609);
+            message.AddExtension(UnitTestProtoFile.PackedSfixed64Extension, 610L);
+            message.AddExtension(UnitTestProtoFile.PackedFloatExtension, 611F);
+            message.AddExtension(UnitTestProtoFile.PackedDoubleExtension, 612D);
+            message.AddExtension(UnitTestProtoFile.PackedBoolExtension, true);
+            message.AddExtension(UnitTestProtoFile.PackedEnumExtension, ForeignEnum.FOREIGN_BAR);
+            // Add a second one of each field.
+            message.AddExtension(UnitTestProtoFile.PackedInt32Extension, 701);
+            message.AddExtension(UnitTestProtoFile.PackedInt64Extension, 702L);
+            message.AddExtension(UnitTestProtoFile.PackedUint32Extension, 703U);
+            message.AddExtension(UnitTestProtoFile.PackedUint64Extension, 704UL);
+            message.AddExtension(UnitTestProtoFile.PackedSint32Extension, 705);
+            message.AddExtension(UnitTestProtoFile.PackedSint64Extension, 706L);
+            message.AddExtension(UnitTestProtoFile.PackedFixed32Extension, 707U);
+            message.AddExtension(UnitTestProtoFile.PackedFixed64Extension, 708UL);
+            message.AddExtension(UnitTestProtoFile.PackedSfixed32Extension, 709);
+            message.AddExtension(UnitTestProtoFile.PackedSfixed64Extension, 710L);
+            message.AddExtension(UnitTestProtoFile.PackedFloatExtension, 711F);
+            message.AddExtension(UnitTestProtoFile.PackedDoubleExtension, 712D);
+            message.AddExtension(UnitTestProtoFile.PackedBoolExtension, false);
+            message.AddExtension(UnitTestProtoFile.PackedEnumExtension, ForeignEnum.FOREIGN_BAZ);
+        }
+
+        public static void AssertPackedExtensionsSet(TestPackedExtensions message)
+        {
+            Assert.AreEqual(2, message.GetExtensionCount(UnitTestProtoFile.PackedInt32Extension));
+            Assert.AreEqual(2, message.GetExtensionCount(UnitTestProtoFile.PackedInt64Extension));
+            Assert.AreEqual(2, message.GetExtensionCount(UnitTestProtoFile.PackedUint32Extension));
+            Assert.AreEqual(2, message.GetExtensionCount(UnitTestProtoFile.PackedUint64Extension));
+            Assert.AreEqual(2, message.GetExtensionCount(UnitTestProtoFile.PackedSint32Extension));
+            Assert.AreEqual(2, message.GetExtensionCount(UnitTestProtoFile.PackedSint64Extension));
+            Assert.AreEqual(2, message.GetExtensionCount(UnitTestProtoFile.PackedFixed32Extension));
+            Assert.AreEqual(2, message.GetExtensionCount(UnitTestProtoFile.PackedFixed64Extension));
+            Assert.AreEqual(2, message.GetExtensionCount(UnitTestProtoFile.PackedSfixed32Extension));
+            Assert.AreEqual(2, message.GetExtensionCount(UnitTestProtoFile.PackedSfixed64Extension));
+            Assert.AreEqual(2, message.GetExtensionCount(UnitTestProtoFile.PackedFloatExtension));
+            Assert.AreEqual(2, message.GetExtensionCount(UnitTestProtoFile.PackedDoubleExtension));
+            Assert.AreEqual(2, message.GetExtensionCount(UnitTestProtoFile.PackedBoolExtension));
+            Assert.AreEqual(2, message.GetExtensionCount(UnitTestProtoFile.PackedEnumExtension));
+            Assert.AreEqual(601, message.GetExtension(UnitTestProtoFile.PackedInt32Extension, 0));
+            Assert.AreEqual(602L, message.GetExtension(UnitTestProtoFile.PackedInt64Extension, 0));
+            Assert.AreEqual(603u, message.GetExtension(UnitTestProtoFile.PackedUint32Extension, 0));
+            Assert.AreEqual(604uL, message.GetExtension(UnitTestProtoFile.PackedUint64Extension, 0));
+            Assert.AreEqual(605, message.GetExtension(UnitTestProtoFile.PackedSint32Extension, 0));
+            Assert.AreEqual(606L, message.GetExtension(UnitTestProtoFile.PackedSint64Extension, 0));
+            Assert.AreEqual(607u, message.GetExtension(UnitTestProtoFile.PackedFixed32Extension, 0));
+            Assert.AreEqual(608uL, message.GetExtension(UnitTestProtoFile.PackedFixed64Extension, 0));
+            Assert.AreEqual(609, message.GetExtension(UnitTestProtoFile.PackedSfixed32Extension, 0));
+            Assert.AreEqual(610L, message.GetExtension(UnitTestProtoFile.PackedSfixed64Extension, 0));
+            Assert.AreEqual(611F, message.GetExtension(UnitTestProtoFile.PackedFloatExtension, 0));
+            Assert.AreEqual(612D, message.GetExtension(UnitTestProtoFile.PackedDoubleExtension, 0));
+            Assert.AreEqual(true, message.GetExtension(UnitTestProtoFile.PackedBoolExtension, 0));
+            Assert.AreEqual(ForeignEnum.FOREIGN_BAR,
+                            message.GetExtension(UnitTestProtoFile.PackedEnumExtension, 0));
+            Assert.AreEqual(701, message.GetExtension(UnitTestProtoFile.PackedInt32Extension, 1));
+            Assert.AreEqual(702L, message.GetExtension(UnitTestProtoFile.PackedInt64Extension, 1));
+            Assert.AreEqual(703u, message.GetExtension(UnitTestProtoFile.PackedUint32Extension, 1));
+            Assert.AreEqual(704uL, message.GetExtension(UnitTestProtoFile.PackedUint64Extension, 1));
+            Assert.AreEqual(705, message.GetExtension(UnitTestProtoFile.PackedSint32Extension, 1));
+            Assert.AreEqual(706L, message.GetExtension(UnitTestProtoFile.PackedSint64Extension, 1));
+            Assert.AreEqual(707u, message.GetExtension(UnitTestProtoFile.PackedFixed32Extension, 1));
+            Assert.AreEqual(708uL, message.GetExtension(UnitTestProtoFile.PackedFixed64Extension, 1));
+            Assert.AreEqual(709, message.GetExtension(UnitTestProtoFile.PackedSfixed32Extension, 1));
+            Assert.AreEqual(710L, message.GetExtension(UnitTestProtoFile.PackedSfixed64Extension, 1));
+            Assert.AreEqual(711F, message.GetExtension(UnitTestProtoFile.PackedFloatExtension, 1));
+            Assert.AreEqual(712D, message.GetExtension(UnitTestProtoFile.PackedDoubleExtension, 1));
+            Assert.AreEqual(false, message.GetExtension(UnitTestProtoFile.PackedBoolExtension, 1));
+            Assert.AreEqual(ForeignEnum.FOREIGN_BAZ, message.GetExtension(UnitTestProtoFile.PackedEnumExtension, 1));
+        }
+
+        public static void AssertUnpackedExtensionsSet(TestUnpackedExtensions message)
+        {
+            Assert.AreEqual(2, message.GetExtensionCount(UnitTestExtrasProtoFile.UnpackedInt32Extension));
+            Assert.AreEqual(2, message.GetExtensionCount(UnitTestExtrasProtoFile.UnpackedInt64Extension));
+            Assert.AreEqual(2, message.GetExtensionCount(UnitTestExtrasProtoFile.UnpackedUint32Extension));
+            Assert.AreEqual(2, message.GetExtensionCount(UnitTestExtrasProtoFile.UnpackedUint64Extension));
+            Assert.AreEqual(2, message.GetExtensionCount(UnitTestExtrasProtoFile.UnpackedSint32Extension));
+            Assert.AreEqual(2, message.GetExtensionCount(UnitTestExtrasProtoFile.UnpackedSint64Extension));
+            Assert.AreEqual(2, message.GetExtensionCount(UnitTestExtrasProtoFile.UnpackedFixed32Extension));
+            Assert.AreEqual(2, message.GetExtensionCount(UnitTestExtrasProtoFile.UnpackedFixed64Extension));
+            Assert.AreEqual(2, message.GetExtensionCount(UnitTestExtrasProtoFile.UnpackedSfixed32Extension));
+            Assert.AreEqual(2, message.GetExtensionCount(UnitTestExtrasProtoFile.UnpackedSfixed64Extension));
+            Assert.AreEqual(2, message.GetExtensionCount(UnitTestExtrasProtoFile.UnpackedFloatExtension));
+            Assert.AreEqual(2, message.GetExtensionCount(UnitTestExtrasProtoFile.UnpackedDoubleExtension));
+            Assert.AreEqual(2, message.GetExtensionCount(UnitTestExtrasProtoFile.UnpackedBoolExtension));
+            Assert.AreEqual(2, message.GetExtensionCount(UnitTestExtrasProtoFile.UnpackedEnumExtension));
+            Assert.AreEqual(601, message.GetExtension(UnitTestExtrasProtoFile.UnpackedInt32Extension, 0));
+            Assert.AreEqual(602L, message.GetExtension(UnitTestExtrasProtoFile.UnpackedInt64Extension, 0));
+            Assert.AreEqual(603u, message.GetExtension(UnitTestExtrasProtoFile.UnpackedUint32Extension, 0));
+            Assert.AreEqual(604uL, message.GetExtension(UnitTestExtrasProtoFile.UnpackedUint64Extension, 0));
+            Assert.AreEqual(605, message.GetExtension(UnitTestExtrasProtoFile.UnpackedSint32Extension, 0));
+            Assert.AreEqual(606L, message.GetExtension(UnitTestExtrasProtoFile.UnpackedSint64Extension, 0));
+            Assert.AreEqual(607u, message.GetExtension(UnitTestExtrasProtoFile.UnpackedFixed32Extension, 0));
+            Assert.AreEqual(608uL, message.GetExtension(UnitTestExtrasProtoFile.UnpackedFixed64Extension, 0));
+            Assert.AreEqual(609, message.GetExtension(UnitTestExtrasProtoFile.UnpackedSfixed32Extension, 0));
+            Assert.AreEqual(610L, message.GetExtension(UnitTestExtrasProtoFile.UnpackedSfixed64Extension, 0));
+            Assert.AreEqual(611F, message.GetExtension(UnitTestExtrasProtoFile.UnpackedFloatExtension, 0));
+            Assert.AreEqual(612D, message.GetExtension(UnitTestExtrasProtoFile.UnpackedDoubleExtension, 0));
+            Assert.AreEqual(true, message.GetExtension(UnitTestExtrasProtoFile.UnpackedBoolExtension, 0));
+            Assert.AreEqual(UnpackedExtensionsForeignEnum.FOREIGN_BAR,
+                            message.GetExtension(UnitTestExtrasProtoFile.UnpackedEnumExtension, 0));
+            Assert.AreEqual(701, message.GetExtension(UnitTestExtrasProtoFile.UnpackedInt32Extension, 1));
+            Assert.AreEqual(702L, message.GetExtension(UnitTestExtrasProtoFile.UnpackedInt64Extension, 1));
+            Assert.AreEqual(703u, message.GetExtension(UnitTestExtrasProtoFile.UnpackedUint32Extension, 1));
+            Assert.AreEqual(704uL, message.GetExtension(UnitTestExtrasProtoFile.UnpackedUint64Extension, 1));
+            Assert.AreEqual(705, message.GetExtension(UnitTestExtrasProtoFile.UnpackedSint32Extension, 1));
+            Assert.AreEqual(706L, message.GetExtension(UnitTestExtrasProtoFile.UnpackedSint64Extension, 1));
+            Assert.AreEqual(707u, message.GetExtension(UnitTestExtrasProtoFile.UnpackedFixed32Extension, 1));
+            Assert.AreEqual(708uL, message.GetExtension(UnitTestExtrasProtoFile.UnpackedFixed64Extension, 1));
+            Assert.AreEqual(709, message.GetExtension(UnitTestExtrasProtoFile.UnpackedSfixed32Extension, 1));
+            Assert.AreEqual(710L, message.GetExtension(UnitTestExtrasProtoFile.UnpackedSfixed64Extension, 1));
+            Assert.AreEqual(711F, message.GetExtension(UnitTestExtrasProtoFile.UnpackedFloatExtension, 1));
+            Assert.AreEqual(712D, message.GetExtension(UnitTestExtrasProtoFile.UnpackedDoubleExtension, 1));
+            Assert.AreEqual(false, message.GetExtension(UnitTestExtrasProtoFile.UnpackedBoolExtension, 1));
+            Assert.AreEqual(UnpackedExtensionsForeignEnum.FOREIGN_BAZ, message.GetExtension(UnitTestExtrasProtoFile.UnpackedEnumExtension, 1));
+        }
+
+        private static readonly string[] TestCultures = {"en-US", "en-GB", "fr-FR", "de-DE"};
+
+        public delegate void CultureAction();
+
+        public static void TestInMultipleCultures(CultureAction test)
+        {
+#if COMPACT_FRAMEWORK
+            test();
+#else
+            CultureInfo originalCulture = Thread.CurrentThread.CurrentCulture;
+            foreach (string culture in TestCultures)
+            {
+                try
+                {
+                    Thread.CurrentThread.CurrentCulture = new CultureInfo(culture);
+                    test();
+                }
+                finally
+                {
+                    Thread.CurrentThread.CurrentCulture = originalCulture;
+                }
+            }
+#endif
+        }
+
+        /// <summary>
+        /// Helper to construct a byte array from a bunch of bytes.
+        /// </summary>
+        internal static byte[] Bytes(params byte[] bytesAsInts)
+        {
+            byte[] bytes = new byte[bytesAsInts.Length];
+            for (int i = 0; i < bytesAsInts.Length; i++)
+            {
+                bytes[i] = (byte) bytesAsInts[i];
+            }
+            return bytes;
+        }
+
+
+        internal delegate void Action();
+
+        internal static void AssertNotSupported(Action action)
+        {
+            try
+            {
+                action();
+                Assert.Fail("Expected NotSupportedException");
+            }
+            catch (NotSupportedException)
+            {
+                // Expected
+            }
+        }
+
+        internal static void AssertArgumentNullException(Action action)
+        {
+            try
+            {
+                action();
+                Assert.Fail("Exception was not thrown");
+            }
+            // Not a general case, however, Compact Framework v2 does use Invoke
+            catch (System.Reflection.TargetInvocationException te)
+            {
+                if (te.InnerException.GetType() != typeof(ArgumentNullException))
+                    throw;
+            }
+            // Normally expected exception
+            catch (ArgumentNullException)
+            {
+                // We expect this exception.
+            }
+        }
+
+        internal static void AssertBytesEqual(byte[] a, byte[]b)
+        {
+            if (a == null || b == null)
+            {
+                Assert.AreEqual<object>(a, b);
+            }
+            else
+            {
+                Assert.AreEqual(a.Length, b.Length, "The byte[] is not of the expected length.");
+
+                for (int i = 0; i < a.Length; i++)
+                {
+                    if (a[i] != b[i])
+                    {
+                        Assert.AreEqual(a[i], b[i], "Byte[] differs at index " + i);
+                    }
+                }
+            }
+        }
+    }
+}
+\ No newline at end of file