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wickkidd/TimeCop.java

Created January 6, 2020 17:30
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  1. wickkidd created this gist Jan 6, 2020.
    24 changes: 24 additions & 0 deletions TimeCop.java
    View file
    Original file line number Diff line number Diff line change
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    package my.awesome.namespace;

    import org.joda.time.DateTime;
    import org.joda.time.DateTimeUtils;

    public class TimeCop {
    public static void freezeDuring(Runnable block) {
    DateTimeUtils.setCurrentMillisFixed(DateTime.now().getMillis());

    block.run();

    DateTimeUtils.setCurrentMillisSystem();
    };
    }

    // usage example
    TimeUnit defaultUnit = TimeUnit.HOURS;
    int defaultInterval = 1;

    TimeCop.freezeDuring(() -> {
    myDate = new Date(System.currentTimeMillis() + defaultUnit.toMillis(defaultInterval));

    ClassUnderTest.someMethodThatTriggersADateCreationInAPrivateDelegateMethod();
    });