'setTimeout should return the value of the previous timeout.'

def test_return(self):

    self.proto.timeOut = 5
    self.assertEqual(self.proto.setTimeout(10), 5)
    self.assertEqual(self.proto.setTimeout(None), 10)
    self.assertIsNone(self.proto.setTimeout(1))
    self.assertEqual(self.proto.timeOut, 1)
    self.proto.setTimeout(None)
