class_docstr: Test class for ParserBase properties
class_docstr_tok: ["Test","class","for","ParserBase","properties"]
docstr: ParserBase - Optional Top Level Keys Property
docstr_tok: ["ParserBase","-","Optional","Top","Level","Keys","Property"]
code: def test_optional_top_level_keys_property(self):
      """ParserBase - Optional Top Level Keys Property"""
      expected_result = {"host"}
      assert_equal(
          self._parser._optional_top_level_keys, expected_result
      )
  
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 3 for calling the TestParserBaseConfiguration obj's underlying member method code with example usage: obj.test_optional_top_level_keys_property() without return types