code: def test_bad_transform(self, tokenized_docs):
      vectorizer = representations.Vectorizer()
      with pytest.raises(ValueError):
          _ = vectorizer.transform(tokenized_docs)
  
imports: import pytest
  import numpy
  from scipy.sparse import coo_matrix
  from textacy import extract, representations
label_desc: Use image node_id 6 for calling the TestVectorizer obj's underlying member method code with example usage: obj.test_bad_transform(tokenized_docs) without return types