def METHOD_NAME(self):
    """
    If the final processor returns a bytearray, ``(the_array,), {}`` is
    returned.
    """
    logger = stub(msg=lambda *args, **kw: (args, kw))
    b = build_bl(logger, processors=[lambda *_: bytearray(b"foo")])
    assert ((bytearray(b"foo"),), {}) == b._process_event(None, "name", {})