I had the same issue with TestUnit. I wound up writing my own 
assert_raise function, which I named assert_raise_s, based on the 
TestUnit assert_raise code. I then extend test/unit with the code.

require 'test/unit'
require 'assert_raise_s.rb'

I tried to attach the code but am getting a Rails Application Error. 
Should I post the code itself?

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