'L{Values.lookupByValue} raises L{ValueError} when called with a value
with which no constant is associated.'

def test_notLookupMissingByValue(self):

    self.assertRaises(ValueError, self.STATUS.lookupByValue, 'OK')
    self.assertRaises(ValueError, self.STATUS.lookupByValue, 200)
    self.assertRaises(ValueError, self.STATUS.lookupByValue, '200.1')
