mockito - 如何使用 mockito 模拟分层静态类下定义的最终变量？

Question

我有如下代码

ScheExeService.ScheduleId scheduleID =   ScheExeService.getOneTimeScheduleId(nl.getCompany(), workItem.getId());
ScheExeService.Schedule schedule = ScheExeService.loadSchedule(nl, scheduleID.getId());
Calendar cal = Calendar.getInstance(java.util.TimeZone.getTimeZone(nl.getTimeZone()));
cal.setTime(schedule.attributes.startDate.toDate());

而且我正在尝试模拟“schedule.attributes.startDate.toDate()”

和 ScheExeService 如下所示

public class ScheExeService implements blah
{

  public final static class Schedule {
    public final ScheduleId id;
    public final ScheduleAttributes attributes;
    public final String callableClassName;
    public final long itemId;


 public Schedule(ScheduleId id, ScheduleAttributes attributes, String callableClassName, long itemId)
    {
        this.id = id;
        this.attributes = attributes;
        this.callableClassName = callableClassName;
        this.itemId = itemId;
    }
}
public final static class ScheduleAttributes {

    public final @Nullable LocalDate startDate;
    public final @Nullable LocalTime startTime;
    public final @Nullable LocalDate endDate;
    public final @Nullable LocalTime endTime;
Method code

}
}

我试过了

 doNothing().doThrow(new RuntimeException()).when(mockedCalenderObject).setTime(null);

但我不断得到NPE。

我怎样才能避免 schedule.attributes.startDate.todate() 调用..？

Answer 1

最好不要模拟 List 和 String 之类的数据/值对象，包括 LocalDate 和 LocalTime 之类的 Joda 对象以及 Schedule 和 ScheduleAttributes 之类的数据对象。这主要是因为，除非很难创建实例，否则您可以在测试中创建实例并让 getter 和 setter 按预期运行。

另见：“测试气味：一切都被嘲笑”

根据您的代码，我非常建议loadSchedule模拟（这可能需要重构 ScheExeService 远离静态方法，重构被测系统的后半部分以接受任意调度，或使用 PowerMock）并使用真实调用创建测试调度.

public void yourMethod(NL nl, WorkItem workItem) {
  ScheExeService.ScheduleId scheduleID =   ScheExeService.getOneTimeScheduleId(nl.getCompany(), workItem.getId());
  ScheExeService.Schedule schedule = ScheExeService.loadSchedule(nl, scheduleID.getId());
  processSchedule(schedule);
}

/**
 * Processes schedule for yourMethod. Exposed for testing: Create as many
 * arbitrary Schedules as you want and pass them in to test this thoroughly.
 */
void processSchedule(Schedule schedule) {
  Calendar cal = Calendar.getInstance(java.util.TimeZone.getTimeZone(nl.getTimeZone()));
  cal.setTime(schedule.attributes.startDate.toDate());
  // ...
}