'Verify that all sequence navigation bar tooltips are being displayed upon mouse hover.
If a tooltip does not appear, raise a BrokenPromise.'

def verify_tooltips_displayed(self):

    for (index, tab) in enumerate(self.q(css='#sequence-list    >    li')):
        ActionChains(self.browser).move_to_element(tab).perform()
        self.wait_for_element_visibility('#tab_{index}    >    .sequence-tooltip'.format(index=index), 'Tab    {index}    should    appear'.format(index=index))
