My reading of that statement is their test, assuming they had one, looked something like this:

    rrs = resolver.resolve('www.example.test')
    assert Record("cname1.example.test", type="CNAME") in rrs
    assert Record("192.168.0.1", type="A") in rrs

It's implied that they intentionally tested it that way, without any assertions on the order. Not by oversight of incompetence, but because they didn't want to bake the requirement in due to uncertainty.