class_docstr: Tests for rule_promotion/promoter.py:RulePromoter
docstr: RulePromoter - Destroy previously created rules
docstr_tok: ["RulePromoter","-","Destroy","previously","created","rules"]
code: def teardown(self):
      """RulePromoter - Destroy previously created rules"""
      rule_module.Rule._rules.clear()
      self.dynamo_mock.stop()
  
imports: from datetime import datetime, timedelta
  import os
  from boto3 import client
  from mock import Mock, patch, PropertyMock
  from moto import mock_dynamodb2
  from nose.tools import assert_equal
  from streamalert.rule_promotion.promoter import RulePromoter
  from streamalert.rule_promotion.statistic import StagingStatistic
  from streamalert.shared import config, rule
  from tests.unit.helpers.aws_mocks import MockAthenaClient, setup_mock_rules_table
label_desc: Use image node_id 2 for calling the TestRulePromoter obj's underlying member method code with example usage: obj.teardown() without return types