code: @Deployment public void testDueDateExtension() throws Exception {
    Date date=new SimpleDateFormat("dd-MM-yyyy hh:mm:ss").parse("06-07-1986 12:10:00");
    Map<String,Object> variables=new HashMap<String,Object>();
    variables.put("dateVariable",date);
    ProcessInstance processInstance=runtimeService.startProcessInstanceByKey("dueDateExtension",variables);
    Task task=taskService.createTaskQuery().processInstanceId(processInstance.getId()).singleResult();
    assertNotNull(task.getDueDate());
    assertEquals(date,task.getDueDate());
  }
  