'Formatting attributes prefixed with a minus (C{-}) temporarily disable
the prefixed attribute, emitting no VT102 control sequence to enable
it in the flattened output.'

def test_minus(self):

    self.assertEqual(text.assembleFormattedText(A.bold[A.blink[('Hello', (- A.bold['    world']), '.')]]), '\x1b[1;5mHello\x1b[0;5m    world\x1b[1;5m.')
