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Editorial Team
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Asked: 2026-05-22T17:40:56+00:00

I’m writing some code that does date and time calculations against the current time.

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I’m writing some code that does date and time calculations against the current time. In Joda time, this is accessed through a (Java) constructor, as it is an immutable object. I need to be able to mock so that new DateTime() returns a specific constant instant so I can do sensible test assertions, but leave all other DateTime methods alone.

This is proving nasty. Grails mockFor(DateTime, true) won’t let me mock a Java constructor, yet there is no obvious or readable non-constructor way of getting the time in Joda time.

The only available options seem to involve low-level JVM techniques like JMockit or EasyMock 3 class mocking, which are a pain from Grails. Is there a simple/straightforward way to achieve this?

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  1. Editorial Team

    We ended up creating dateService with now() method. In unit tests we mock it with 

    domainInstance.dateService = [ now: { currentTime } ] as DateService

    where currentTime is a unit test class field. This imposes everybody’s dependency on dateService (our only nearly-global dependency), and for src classes one has to pass it by hand.

    Unit tests, OTOH, look pretty clear with it.

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