code: def test_validate_should_be_idempotent(self):
      # Given
      dataset_stream = io.StringIO(
          """
  # getWeather Intent
  ---
  type: intent
  name: getWeather
  utterances:
    - what is the weather in [weatherLocation:location](Paris)?
    - is it raining in [weatherLocation] [weatherDate:snips/datetime]
  
  # Location Entity
  ---
  type: entity
  name: location
  automatically_extensible: true
  values:
  - [new york, big apple]
  - london
          """
      )
  
      dataset = Dataset.from_yaml_files("en", [dataset_stream])
      validated_dataset = validate_and_format_dataset(dataset)
  
      # When
      validated_dataset_2 = validate_and_format_dataset(
          validated_dataset
      )
  
      # Then
      self.assertDictEqual(validated_dataset, validated_dataset_2)
      self.assertTrue(validated_dataset.get(VALIDATED, False))
  
imports: from __future__ import unicode_literals
  import io
  from builtins import range, str
  from future.utils import iteritems
  from mock import mock, patch
  from snips_nlu.constants import ENTITIES, SNIPS_DATETIME, VALIDATED
  from snips_nlu.dataset import Dataset
  from snips_nlu.dataset.validation import validate_and_format_dataset, _validate_and_format_custom_entity
  from snips_nlu.exceptions import DatasetFormatError
  from snips_nlu.tests.utils import SnipsTest, EntityParserMock
label_desc: Use image node_id 20 for calling the TestDatasetValidation obj's underlying member method code with example usage: obj.test_validate_should_be_idempotent() without return types