docstr: Valid feature name should be untouched
docstr_tok: ["Valid","feature","name","should","be","untouched"]
code: def test_column_name_to_filename(self):
      """Valid feature name should be untouched"""
      col = "feature_1"
      self.assertEqual(EDA.prepare(col), col)
  
      self.tearDown()
  
imports: import os
  import re
  import unittest
  import tempfile
  import json
  import numpy
  import pandas
  import shutil
  from sklearn import datasets
  from supervised import AutoML
  from supervised.preprocessing.eda import EDA
label_desc: Use image node_id 3 for calling the EDATest obj's underlying member method code with example usage: obj.test_column_name_to_filename() without return types