class_docstr: TestRule class
class_docstr_tok: ["TestRule","class"]
code: def teardown(self):
      rule.Rule._rules.clear()
  
imports: import hashlib
  from mock import patch
  from nose.tools import assert_equal, assert_true, raises
  from streamalert.shared import rule, rule_table
label_desc: Use image node_id 2 for calling the TestRule obj's underlying member method code with example usage: obj.teardown() without return types