unit testing private methods in ruby

don't u just love this???

class Class
    def publicize_methods
        saved_private_instance_methods = self.private_instance_methods
        self.class_eval { public *saved_private_instance_methods }
        yield
        self.class_eval { private *saved_private_instance_methods }
      end
end

and to test the private method blah of a class Foo

class TestFoo &Test::Unit::TestCase
  def test_blah
    Foo.publicize_methods do
      assert_not_nil Foo.blah
    end
  end
end 

and thats it... :)