docstr: StreamQuery - QueryPack - load_from_cache
docstr_tok: ["StreamQuery","-","QueryPack","-","load_from_cache"]
code: def test_load_from_cache(self):
      """StreamQuery - QueryPack - load_from_cache"""
      self._execution.state_manager.has.return_value = True
      self._execution.state_manager.get.return_value = {
          "query_execution_id": "1111-2222-3333-4444"
      }
      self._query_pack.load_from_cache()
      assert_equals(
          self._query_pack.query_execution_id, "1111-2222-3333-4444"
      )
      assert_true(self._query_pack.is_previously_started)
  
imports: from datetime import datetime, timezone
  from mock import MagicMock, patch
  from nose.tools import assert_equals, assert_false, assert_true
  from streamalert.scheduled_queries.query_packs.manager import QueryPack, QueryPacksManager, QueryPackExecutionContext, QueryPacksManagerFactory
  from streamalert.scheduled_queries.query_packs.parameters import QueryParameterGenerator
label_desc: Use image node_id 5 for calling the TestQueryPack obj's underlying member method code with example usage: obj.test_load_from_cache() without return types