class_docstr: Tests for cardiotox dataset.
class_docstr_tok: ["Tests","for","cardiotox","dataset","."]
code: def setUpClass(cls):
      cardiotox._DATA_URL = cls.dummy_data
      super().setUpClass()
  
imports: from tensorflow_datasets.graphs.cardiotox import cardiotox
  import tensorflow_datasets.public_api
label_desc: Use image node_id 1 for calling the CardiotoxTest obj's underlying member method code with example usage: obj.setUpClass(cls) without return types