code: def test_fit_raises_error_if_na_in_df(df_na):
      # test case 2: when dataset contains na, fit method
      with pytest.raises(ValueError):
          transformer = ReciprocalTransformer()
          transformer.fit(df_na)
  
file_path: feature_engine/tests/test_transformation/test_reciprocal_transformer.py
imports: import pandas
  import pytest
  from sklearn.exceptions import NotFittedError
  from feature_engine.transformation import ReciprocalTransformer
label_desc: Use image node_id 2 for calling a global function with example usage: test_fit_raises_error_if_na_in_df(df_na) without return types