code: def prepare(self, config):
      if not self.is_valid(config):
          return False
  
      if not self.format_test_record(config):
          return False
  
      # Apply any fixtures needed for this test event
      self.setup_fixtures()
  
      return True
  
imports: import base64
  import json
  import re
  import time
  import zlib
  from mock import patch
  from streamalert.classifier.parsers import ParserBase
  from streamalert.shared import rule
  from streamalert.shared.logger import get_logger
  from streamalert_cli.test.mocks import LookupTableMocks, ThreatIntelMocks
label_desc: Use image node_id 21 for calling the TestEvent obj's underlying member method code with example usage: obj.prepare(config) and returns: True, False, False