'If no device is discovered, the repr of ``AttachedUnexpectedDevice``
shows this with a ``None`` value for ``discovered``.'

def test_nothing_discovered_repr(self):

    requested = FilePath('/dev/sda')
    discovered = None
    expected = "AttachedUnexpectedDevice(requested='/dev/sda',    discovered=None)"
    self.assertEqual(expected, repr(AttachedUnexpectedDevice(requested, discovered)))
