code: def test_fail_column_val_not_in_columns(missingdata_df):
      """Checks that ValueError is raised when specified `columns`
      is not present in the df columns.
      """
      with pytest.raises(ValueError):
          missingdata_df.flag_nulls(columns=["c"])
  
file_path: pyjanitor/tests/functions/test_flag_nulls.py
imports: import pandas
  import pytest
  from pandas.testing import assert_frame_equal
  from janitor.functions import flag_nulls
label_desc: Use image node_id 7 for calling a global function with example usage: test_fail_column_val_not_in_columns(missingdata_df) without return types