'L{flattenEvent} will do nothing to an event with log_format set to
None.'

def test_flattenEventWithNoneFormat(self):

    inputEvent = {'a': 'b', 'c': 1, 'log_format': None}
    flattenEvent(inputEvent)
    self.assertEqual(inputEvent, {'a': 'b', 'c': 1, 'log_format': None})
