docstr: StreamQuery - StepFunctionStateManager - load and write
docstr_tok: ["StreamQuery","-","StepFunctionStateManager","-","load","and","write"]
code: def test_has_load_write_empty(self):
      """StreamQuery - StepFunctionStateManager - load and write"""
      self._sfsm.load_from_step_function_event({})
  
      self._state_manager.set("asdf", "qwerty")
  
      response = {"blah": "?"}
      self._sfsm.write_to_step_function_response(response)
  
      assert_equals(
          response,
          {"blah": "?", "step_function_state": {"asdf": "qwerty"}},
      )
  
file_path: streamalert/tests/unit/streamalert/scheduled_queries/state/test_state_manager.py
imports: from datetime import datetime
  from mock import MagicMock
  from nose.tools import assert_equals, assert_true, assert_false
  from streamalert.scheduled_queries.state.state_manager import StateManager, StepFunctionStateManager
label_desc: Use image node_id 3 for calling the TestStepFunctionStateManager obj's underlying member method code with example usage: obj.test_has_load_write_empty() without return types