'Within an exception handler, _findFailure should return
L{None} in case no Failure is associated with the current
exception.'

def test_findNoFailureInExceptionHandler(self):

    try:
        (1 / 0)
    except:
        self.assertIsNone(failure.Failure._findFailure())
    else:
        self.fail('No    exception    raised    from    1/0!?')
