在单元测试中操纵当前时间？

Question

有没有办法在jUnit 4.5测试中操纵当前时间？我有以下方法,我想进行单元测试

public String getLastWeek() {
  GregorianCalendar c = new GregorianCalendar(TimeZone.getTimeZone("Europe/Stockholm"));
  c.setFirstDayOfWeek(GregorianCalendar.MONDAY);
  c.add(GregorianCalendar.WEEK_OF_YEAR, -1);
  return c.get(GregorianCalendar.YEAR) + " " + c.get(GregorianCalendar.WEEK_OF_YEAR);
}

使测试更容易的一种方法是将其拆分为两种方法

public String getLastWeek() {
  GregorianCalendar c = new GregorianCalendar(TimeZone.getTimeZone("Europe/Stockholm"));
  return getLastWeekFor(c);
}

public String getLastWeekFor(GregorianCalander c) {
  c.setFirstDayOfWeek(GregorianCalendar.MONDAY);
  c.add(GregorianCalendar.WEEK_OF_YEAR, -1);
  return c.get(GregorianCalendar.YEAR) + " " + c.get(GregorianCalendar.WEEK_OF_YEAR);
}

这让我测试了周减法逻辑,但是让getLastWeek没有经过测试,我更喜欢只有一种方法.

Answer 1

你没有真正的方法来操纵系统时间.

实际上,为了使它可测试,你很好地重构了这个方法.我会坚持这一点.