code: def test_generate_worst_examples_dataframe():
      test_df = pd.DataFrame(
          {
              "a": [3, 2, 5],
              "b": [6, 9, 1],
          }
      )
      target_col = "b"
      predictions = [5, 3, 4]
  
      result_df = BaseStep._generate_worst_examples_dataframe(
          test_df,
          predictions,
          predictions - test_df[target_col].to_numpy(),
          target_col,
          worst_k=2,
      )
  
      def assert_result_correct(df):
          assert df.columns.tolist() == [
              "absolute_error",
              "prediction",
              "b",
              "a",
          ]
          assert df.absolute_error.tolist() == [6, 3]
          assert df.prediction.tolist() == [3, 4]
          assert df.b.tolist() == [9, 1]
          assert df.a.tolist() == [2, 5]
          assert df.index.tolist() == [0, 1]
  
      assert_result_correct(result_df)
  
      test_df2 = test_df.set_axis([2, 1, 0], axis="index")
      result_df2 = BaseStep._generate_worst_examples_dataframe(
          test_df2,
          predictions,
          predictions - test_df2[target_col].to_numpy(),
          target_col,
          worst_k=2,
      )
      assert_result_correct(result_df2)
  
imports: import os
  import pathlib
  import re
  import shutil
  from unittest import mock
  import pandas
  import pytest
  import yaml
  import mlflow
  from mlflow.entities import Run, SourceType
  from mlflow.entities.model_registry import ModelVersion
  from mlflow.exceptions import MlflowException
  from mlflow.recipes.recipe import Recipe
  from mlflow.recipes.step import BaseStep
  from mlflow.recipes.utils.execution import _MAKEFILE_FORMAT_STRING, _get_execution_directory_basename, get_step_output_path
  from mlflow.tracking.client import MlflowClient
  from mlflow.tracking.context.registry import resolve_tags
  from mlflow.utils.file_utils import path_to_local_file_uri
  from mlflow.utils.mlflow_tags import LEGACY_MLFLOW_GIT_REPO_URL, MLFLOW_GIT_COMMIT, MLFLOW_GIT_REPO_URL, MLFLOW_SOURCE_NAME, MLFLOW_SOURCE_TYPE
  from tests.recipes.helper_functions import chdir, list_all_artifacts
label_desc: Use image node_id 11 for calling a global function with example usage: test_generate_worst_examples_dataframe() without return types