code: def test_in_network_invalid_ip():
      """Utils - In Network - Invalid IP"""
      assert_false(
          utils.in_network(
              "a string that is not an ip", {"10.0.100.0/24"}
          )
      )
  
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 2 for calling a global function with example usage: test_in_network_invalid_ip() without return types