[FIXED] Can't mock Date class

Issue

i am using mockito and i have a custom date class and i want to be able to mock this date class in my test class, so i tried the following:

    MVDate date = Mockito.mock(MYDate.class);
    Mockito.when(date.get(Calendar.MONTH)).thenReturn(5);

MYDate Class:

public class MYDate extends GregorianCalendar implements Comparable<Calendar> {

public MYDate() {
        setTime(new Date());
    }

}

but when trying to print the new MYDate(); it always prints the current date. please advise how should i mock the calendar class so that i can test on specific date for all methods who create new data instance.

Solution

Please note: I wrote this answer in 2013. Things are a bit different now. Basil Bourque's answer is the correct one.

I would use a Factory class to make the Date objects, rather than using new Date(). Have a second constructor for MyDate where you can pass the Factory. Then use a mock of the Factory, which you can set up to return whatever date you like.

public class DateFactory{
    public Date makeDate(){
        return new Date();
    }
}

-----------------------------------

public class MyDate extends GregorianCalendar implements Comparable<Calendar>{

    public MyDate(){
        this(new DateFactory());
    }

    MyDate(DateFactory factory){
        setTime(factory.makeDate());
    }
}

Answered By - Dawood ibn Kareem