'An argument of the form C{"ip/domain"} is parsed by L{Options} for the
I{--secondary} option and added to its list of secondaries, using the
default DNS port number.'

def test_secondary(self):

    options = Options()
    options.parseOptions(['--secondary', '1.2.3.4/example.com'])
    self.assertEqual([(('1.2.3.4', PORT), ['example.com'])], options.secondaries)
