code: def test_test_data_dir(self, test_data_dir):
      """Just a dummy tests showing how to use the test_data_dir fixture."""
      # test_data_dir contains the absolute path to nemo -> tests/.data
      assert exists(test_data_dir)
      assert exists(join(test_data_dir, "test_data.tar.gz"))
  
label_desc: Use image node_id 1 for calling the TestDataDir obj's underlying member method code with example usage: obj.test_test_data_dir(test_data_dir) without return types