tests: do local pylint disabling properly
    
    This is the right way to disable pylint messages for a single
    line. It's not right to put the disable comment on its own
    line directly above the line you want to disable the message
    for. A pylint disable comment on its own line disables the
    message in that *block level* - so if the comment is outside
    of any class or function, it disables the message for the
    entire rest of the file. See:
    https://pylint.readthedocs.io/en/latest/faq.html#message-control