'Creating a L{MessageSet} with a single message number adds
only that message to the L{MessageSet}; its serialized form
includes only that message number, its length is one, and it
yields only that message number.'

def test_createWithSingleMessageNumber(self):

    m = MessageSet(1)
    self.assertEqual(str(m), '1')
    self.assertEqual(len(m), 1)
    self.assertEqual(list(m), [1])
