Question

I have a method:

expect(processor.process(arg1, list));
expectLastCall().anyTImes();

Now, I need the list to contain certain values. And the problem is that the values have to be added to the list in a right order, otherwise the list won’t equal the real list. So I cannot just make a new list and add values into it, because if method process changed order of adding values into the list, the test would fail.
I tried this

List list=createMock(List.class);
expect(list.add(value1)).andReturn(true);
expect(lst.add(value2)).andReturn(true);

but he gives this exception:

java.lang.AssertionError: 
  Unexpected method call process(arg, [Listvalue1,Listvalue2]):
    process(arg, EasyMock for interface java.util.List): expected: 1, actual: 0

Thanks a lot.

Answer 1

You could use IAnswer and EasyMock.getCurrentArguments() and then manually assert the contents of the list

expect(processor.process(arg1, list));
expectLastCall().anyTimes().andAnswer(new IAnswer<Object>() {
    public Object answer() throws Throwable {
        List myList = (List) EasyMock.getCurrentArguments()[1];
        // do your assertions on the list here (or change the order as required)
    }    
});

A big drawback of using EasyMock.getCurrentArguments() is that it is not “refactor-safe” (If you change the order of the parameters it will break the test).

Hope it helps.