public void SerializeExtensions()
{
// TestAllTypes and TestAllExtensions should have compatible wire formats,
// so if we serialize a TestAllExtensions then parse it as TestAllTypes
// it should work.
TestAllExtensions message = TestUtil.GetAllExtensionsSet();
ByteString rawBytes = message.ToByteString();
Assert.AreEqual(rawBytes.Length, message.SerializedSize);
TestAllTypes message2 = TestAllTypes.ParseFrom(rawBytes);
TestUtil.AssertAllFieldsSet(message2);
}