检查双精度值时,通常为asserEquals()中的比较函数提供精度(delta)
如何对日期时间值做同样的事情?假设我不想与微秒精度进行比较,而是希望检查一些不精确的计时。
如何做到这一点?
最佳答案
就个人而言,我会为此编写一个简单的Hamcrest风格Matcher ...
class CloseToDate extends BaseMatcher<Date> {
private Date closeTo;
private long deltaInMs;
public CloseToDate(Date closeTo, long deltaInMs) {
this.closeTo = closeTo;
this.deltaInMs = deltaInMs;
}
@Override
public boolean matches(Object arg0) {
if (!(arg0 instanceof Date)) {
return false;
}
Date date = (Date)arg0;
return Math.abs( date.getTime() - closeTo.getTime()) <= deltaInMs;
}
@Override
public void describeTo(Description arg0) {
arg0.appendText(String.format("Not more than %s ms from %s", deltaInMs, closeTo));
}
public static CloseToDate closeToDate(Date date, long deltaInMs) {
return new CloseToDate(date, deltaInMs);
}
}
这样,您可以使用静态导入来简单地编写...
assertThat( myDate, closeToDate( someDate, 1000 ) ); // for 1000ms tolerance
...如果您问我,它的可读性很好。