class_docstr: Class for representation test cases. Most tests are
  parameterized, some are implemented individually
  (e.g. to test a formula manually).
code: def test_vectorization_simple(
      self, name, test_function, correct_output
  ):
      s_true = correct_output
      result_s = test_function(s_tokenized)
      pd.testing.assert_frame_equal(s_true, result_s, check_dtype=False)
  
imports: import pandas
  import numpy
  from texthero import representation
  from texthero import preprocessing
  import pytest
  from .conftest import broken_case
  import doctest
  import unittest
  import string
  import math
  import warnings
  from parameterized import parameterized
label_desc: Use image node_id 1 for calling the TestAbstractRepresentation obj's underlying member method code with example usage: obj.test_vectorization_simple(name, test_function, correct_output) without return types