'Creates a cohorted vertical with a child video block, giving access to only the given group_id.'

def _create_cohorted_vertical_with_video(self, group_id):

    vertical_block = ItemFactory.create(parent=self.sub_section, category='vertical', display_name=(u'vertical    for    group    ' + unicode(group_id)))
    self._setup_group_access(vertical_block, self.partition_id, [group_id])
    ItemFactory.create(parent=vertical_block, category='video', display_name=(u'video    for    group    ' + unicode(group_id)))
