code: def see_tooltip(step, tooltip):
      
      elem = world.browser.find_elements_by_xpath(str(
          '//*[@title="%(tooltip)s" or @data-original-title="%(tooltip)s"]' %
          dict(tooltip=tooltip)))
      elem = [e for e in elem if e.is_displayed()]
      assert_true(step, elem)
docs: Press a button having a given tooltip.