'L{flattenEvent} will do nothing to an event with a format string that
contains no format fields.'

def test_flattenEventWithInertFormat(self):

    inputEvent = {'a': 'b', 'c': 1, 'log_format': 'simple    message'}
    flattenEvent(inputEvent)
    self.assertEqual(inputEvent, {'a': 'b', 'c': 1, 'log_format': 'simple    message'})
