'The PREFIX support parameter is parsed into a dictionary mapping
modes to two-tuples of status symbol and priority.'

def test_support_PREFIX(self):

    self._testFeatureDefault('PREFIX')
    self._testFeatureDefault('PREFIX', [('PREFIX', 'hello')])
    self.assertEqual(self._parseFeature('PREFIX', None), None)
    self.assertEqual(self._parseFeature('PREFIX', '(ohv)@%+'), {'o': ('@', 0), 'h': ('%', 1), 'v': ('+', 2)})
    self.assertEqual(self._parseFeature('PREFIX', '(hov)@%+'), {'o': ('%', 1), 'h': ('@', 0), 'v': ('+', 2)})
