In Grails, is there a good way to mock the current time using Joda time?

Question

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 obje

Answer 1

you could just use good old-fashioned OO principles, e.g.

  interface TimeService {
    DateTime getCurrentTime()

    // other time-related methods
  }

  class JodaTimeService implements TimeService {
    DateTime getCurrentTime() {
      new DateTime()
    }  
  }

  class MockTimeService implements TimeService {
    DateTime getCurrentTime() {
      // return a fixed point in time
    }  
  }

Your code should get a reference to an implementation of TimeService via dependency injection. In resources.groovy use the MockTimeService only when running the tests

import grails.util.Environment

beans = {    
    if (Environment.current == Environment.TEST) {
        timeService(MockTimeService)

    } else {
         timeService(JodaTimeService)
    }
}