'Test value of \'limit\' is numeric and >= 0'

def test_get_all_limit_bad_value(self):

    volume_api = cinder.volume.api.API()
    self.assertRaises(exception.InvalidInput, volume_api.get_all, self.context, limit='A')
    self.assertRaises(exception.InvalidInput, volume_api.get_all, self.context, limit='-1')
