class_docstr: Classifier tests
code: def _mock_sources(cls):
      return {cls._service_name: {cls._resource_name: ["log_type_01"]}}
  
imports: from collections import OrderedDict
  import os
  from mock import Mock, patch
  from nose.tools import assert_equal, assert_raises
  import streamalert.classifier.classifier
  from streamalert.classifier.classifier import Classifier
  from streamalert.shared.exceptions import ConfigError
label_desc: Use image node_id 4 for calling the TestClassifier obj's underlying member method code with example usage: obj._mock_sources(cls) and returns: dict