class_docstr: TestRuleStats class
class_docstr_tok: ["TestRuleStats","class"]
docstr: RuleStatistic - Addition
docstr_tok: ["RuleStatistic","-","Addition"]
code: def test_rule_stats_add(self):
      """RuleStatistic - Addition"""
      stat = stats.RuleStatistic(10.0)
      stat += stats.RuleStatistic(12.5)
  
      assert_equal(stat.calls, 1)
      assert_equal(stat.tracked_time, 22.5)
  
file_path: streamalert/tests/unit/streamalert/shared/test_stats.py
imports: from collections import namedtuple
  from mock import Mock, patch
  from nose.tools import assert_equal
  from streamalert.shared import stats
label_desc: Use image node_id 4 for calling the TestRuleStats obj's underlying member method code with example usage: obj.test_rule_stats_add() without return types