code: def setUpClass(cls):
      super(TranslateWmtCustomConfigTest, cls).setUpClass()
  
      config = wmt.WmtConfig(
          name="small",
          language_pair=("cs", "en"),
          description="Example of custom config",
          subsets={
              "train": ["paracrawl_v3"],
              "validation": ["newstest2009", "newstest2010"],
          },
          version=tfds.core.Version("1.0.0"),
      )
      wmt.WmtTranslate.BUILDER_CONFIGS = [config]
  
file_path: datasets/tensorflow_datasets/translate/wmt_test.py
imports: import os
  from tensorflow_datasets import testing
  import tensorflow_datasets.public_api
  from tensorflow_datasets.translate import wmt
label_desc: Use image node_id 1 for calling the TranslateWmtCustomConfigTest obj's underlying member method code with example usage: obj.setUpClass(cls) without return types