code: def test_in_network_invalid_cidr():
      """Utils - In Network - Invalid CIDR"""
      assert_false(utils.in_network("127.0.0.1", {"not a cidr"}))
  
file_path: streamalert/tests/unit/streamalert/shared/test_utils.py
imports: import json
  from nose.tools import assert_equal, assert_false
  from streamalert.shared import utils
  from streamalert.shared.normalize import Normalizer
label_desc: Use image node_id 3 for calling a global function with example usage: test_in_network_invalid_cidr() without return types