docstr: StreamQuery - AthenaQueryResult - headers
docstr_tok: ["StreamQuery","-","AthenaQueryResult","-","headers"]
code: def test_headers(self):
      """StreamQuery - AthenaQueryResult - headers"""
      assert_equals(
          self._result.headers, ["date", "assume_role", "count"]
      )
  
imports: from datetime import datetime
  from dateutil.tz import tzlocal
  from mock import MagicMock
  from nose.tools import assert_equals, assert_true, assert_false
  from streamalert.scheduled_queries.handlers.athena import AthenaClient, AthenaQueryExecution, AthenaQueryResult
label_desc: Use image node_id 4 for calling the TestAthenaQueryResult obj's underlying member method code with example usage: obj.test_headers() without return types