def METHOD_NAME(self):
    # If LOOP packets windGustDir=None, the accumulator should not substitute windDir.
    # This is a regression test that tests that.
    accum = weewx.accum.Accum(TimeSpan(start_ts, stop_ts))
    # Add the dataset to the accumulator. Null out windGustDir first.
    for record in self.dataset:
        record_test = dict(record)
        record_test['windGustDir'] = None
        accum.addRecord(record_test)
    # Extract the record out of the accumulator
    accum_record = accum.getRecord()
    # windGustDir should match the windDir seen at max wind:
    self.assertIsNone(accum_record['windGustDir'])