code: def test_check_additional_data_raises_index(self):
      x_init = pd.DataFrame(
          data=np.array([[1, 2], [3, 4]]), columns=["Col1", "Col2"]
      )
      additional_data = pd.DataFrame(
          data=np.array([[5]]), columns=["Col3"]
      )
      with pytest.raises(Exception) as exc_info:
          check_additional_data(x_init, additional_data)
      assert (
          str(exc_info.value)
          == "x and additional_data should have the same index."
      )
  
imports: import unittest
  import pytest
  import pandas
  import numpy
  import category_encoders
  from shapash.utils.check import check_preprocessing, check_model, check_label_dict, check_mask_params, check_y, check_contribution_object, check_preprocessing_options, check_postprocessing, check_consistency_model_features, check_consistency_model_label, check_additional_data
  from sklearn.compose import ColumnTransformer
  import sklearn.preprocessing
  import types
  import sklearn.ensemble
  import sklearn.svm
  import sklearn.linear_model
  import xgboost
  import lightgbm
  import catboost
label_desc: Use image node_id 26 for calling the TestCheck obj's underlying member method code with example usage: obj.test_check_additional_data_raises_index() without return types