in validations_i18n_test.rb:
 
    def test_validates_length_of_counts_utf8_characters
      Topic.validates_length_of :title, :is => 7
      @topic.title = 'El Niño'
      @topic.errors.expects(:generate_message).never
      @topic.errors.expects(:generate_message).never
      @topic.valid?
    end