Unit test correction for types that were moved to different proto files
diff --git a/src/ProtocolBuffers.Test/AbstractMessageTest.cs b/src/ProtocolBuffers.Test/AbstractMessageTest.cs
index bef5052..a502a6c 100644
--- a/src/ProtocolBuffers.Test/AbstractMessageTest.cs
+++ b/src/ProtocolBuffers.Test/AbstractMessageTest.cs
@@ -133,6 +133,7 @@
             byte[] bytes = TestUtil.GetPackedSet().ToByteArray();

             ExtensionRegistry registry = ExtensionRegistry.CreateInstance();

             UnitTestProtoFile.RegisterAllExtensions(registry);

+            UnitTestExtrasProtoFile.RegisterAllExtensions(registry);

             TestUnpackedExtensions message = TestUnpackedExtensions.ParseFrom(bytes, registry);

             TestUtil.AssertUnpackedExtensionsSet(message);

         }