class_docstr: Test class for ParserBase classmethods
class_docstr_tok: ["Test","class","for","ParserBase","classmethods"]
docstr: ParserBase - Add Optional Keys, None
docstr_tok: ["ParserBase","-","Add","Optional","Keys",",","None"]
code: def test_add_optional_keys_none(self):
      """ParserBase - Add Optional Keys, None"""
      schema = {"key": "string"}
      record = {"key": "data"}
      ParserBase._add_optional_keys(record, schema, None)
      assert_equal(record, {"key": "data"})
  
imports: import json
  from mock import patch
  from nose.tools import assert_equal
  import streamalert.classifier.parsers
  from streamalert.classifier.parsers import ParserBase
label_desc: Use image node_id 9 for calling the TestParserBaseClassMethods obj's underlying member method code with example usage: obj.test_add_optional_keys_none() without return types