class_docstr: Normalizer tests
class_docstr_tok: ["Normalizer","tests"]
docstr: Normalizer - Load normalized_types from conf when it was loaded previously
docstr_tok: ["Normalizer","-","Load","normalized_types","from","conf","when","it","was","loaded","previously"]
code: def test_load_from_config_exist_types_config(self):
      """Normalizer - Load normalized_types from conf when it was loaded previously"""
      Normalizer._types_config = {"normalized_type1": {}}
      assert_equal(
          Normalizer.load_from_config({"foo": "bar"}), Normalizer
      )
  
imports: from mock import Mock, patch
  from nose.tools import assert_equal, assert_false, assert_raises, assert_true
  from streamalert.shared.exceptions import ConfigError
  from streamalert.shared.normalize import Normalizer, NormalizedType
  from tests.unit.streamalert.shared.test_utils import MOCK_RECORD_ID
label_desc: Use image node_id 16 for calling the TestNormalizer obj's underlying member method code with example usage: obj.test_load_from_config_exist_types_config() without return types