code: def test_trainset_none(self):
      bm = BaseMethod(None, verbose=True)
      try:
          bm.evaluate(None, {}, False)
      except ValueError:
          assert True
  
file_path: cornac/tests/cornac/eval_methods/test_base_method.py
imports: import unittest
  from cornac.eval_methods import BaseMethod
  from cornac.data import FeatureModality, TextModality, ReviewModality, ImageModality, SentimentModality
  from cornac.data import Dataset, Reader
  from cornac.metrics import MAE, AUC
  from cornac.models import MF
label_desc: Use image node_id 2 for calling the TestBaseMethod obj's underlying member method code with example usage: obj.test_trainset_none() without return types