code: def test_show_first_example_in_df():
      df = pd.DataFrame(
          {
              "question": ["question sample"],
              "context": ["context sample"],
              "answer": ["answer sample"],
          }
      )
  
      message = f"-->Column question:\nquestion sample\n"
      message += f"-->Column context:\ncontext sample\n"
      message += f"-->Column answer:\nanswer sample\n"
  
      assert message == show_first_example_in_df(df)
  
imports: import pandas
  import pytest
  from ..customization_dataset_preparation import convert_into_prompt_completion_only, convert_into_template, drop_duplicated_rows, drop_unrequired_fields, get_common_suffix, get_prepared_filename, parse_template, recommend_hyperparameters, show_first_example_in_df, split_into_train_validation, template_mapper, validate_template, warn_and_drop_long_samples, warn_completion_is_not_empty, warn_duplicated_rows, warn_imbalanced_completion, warn_low_n_samples, warn_missing_suffix
label_desc: Use image node_id 17 for calling a global function with example usage: test_show_first_example_in_df() without return types