class_docstr: Test Streamlit utility functions.
class_docstr_tok: ["Test","Streamlit","utility","functions","."]
code: def test_unsuccessful_index_(self, input, find_value):
      with self.assertRaises(ValueError):
          util.index_(input, find_value)
  
file_path: streamlit/lib/tests/streamlit/util_test.py
imports: import random
  import unittest
  from typing import Dict, List, Set
  from unittest.mock import patch
  import numpy
  from parameterized import parameterized
  from streamlit import util
label_desc: Use image node_id 7 for calling the UtilTest obj's underlying member method code with example usage: obj.test_unsuccessful_index_(input, find_value) without return types