public void ParseExtensions()
{
// TestAllTypes and TestAllExtensions should have compatible wire formats,
// so if we serealize a TestAllTypes then parse it as TestAllExtensions
// it should work.
TestAllTypes message = TestUtil.GetAllSet();
ByteString rawBytes = message.ToByteString();
ExtensionRegistry registry = ExtensionRegistry.CreateInstance();
TestUtil.RegisterAllExtensions(registry);
registry = registry.AsReadOnly();
TestAllExtensions message2 = TestAllExtensions.ParseFrom(rawBytes, registry);
TestUtil.AssertAllExtensionsSet(message2);
}