I'm sorry, I'm not near a computer at the moment, so can I ask whether you've tried to narrow down the problem any further e.g. does the same thing happen if you stub a different method on I18n, or if you stub a method on a different class, or if you use Test::Unit without Shoulda?
Can you create a single Ruby file which demonstrates the problem with as few dependencies as possible? i.e. a file any of us could run locally and see the problem for ourselves. It would also be helpful to tell us as much as possible about your environment e.g. OS version, Ruby version, Mocha version and versions of any dependencies.
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