def METHOD_NAME(self):
    """
    <b> tags are allowed without attributes. This remains true
    when tags are nested.
    """
    soup = self.get_soup('<b><b class="delete me">foo</b></b>', "html5lib")
    tag = soup.b
    self.whitelister.clean_tag_node(tag, tag)
    self.assertEqual(str(tag), "<b><b>foo</b></b>")