code: def test_error_when_fold_is_1():
      with pytest.raises(ValueError):
          EndTailImputer(fold=-1)
  
file_path: feature_engine/tests/test_imputation/test_end_tail_imputer.py
imports: import numpy
  import pandas
  import pytest
  from feature_engine.imputation import EndTailImputer
label_desc: Use image node_id 8 for calling a global function with example usage: test_error_when_fold_is_1() without return types