'Nested attributes retain the attributes of their parents.'

def test_assembleNested(self):

    self.assertEqual(irc.assembleFormattedText(A.bold[('hello', A.underline['    world'])]), '\x0f\x02hello\x0f\x02\x1f    world')
    self.assertEqual(irc.assembleFormattedText(A.normal[(A.fg.red[(A.bg.green['hello'], '    world')], A.reverseVideo['    yay'])]), '\x0f\x0305,03hello\x0f\x0305    world\x0f\x16    yay')
