code: @Deployment public void testHistoricActivityInstanceUnfinished(){
    ProcessInstance processInstance=runtimeService.startProcessInstanceByKey("oneTaskProcess");
    assertNotNull(processInstance);
    HistoricActivityInstanceQuery historicActivityInstanceQuery=historyService.createHistoricActivityInstanceQuery();
    long finishedActivityInstanceCount=historicActivityInstanceQuery.finished().count();
    assertEquals("The Start event is completed",1,finishedActivityInstanceCount);
    long unfinishedActivityInstanceCount=historicActivityInstanceQuery.unfinished().count();
    assertEquals("One active (unfinished) User Task",1,unfinishedActivityInstanceCount);
  }
  