Re: How to mock a Java Future?

[Peter Niederwieser]

Mocking and stubbing has to be done together. You can't split up "eS.submit" into two parts. Search the mailing list for more information (this has been discussed many times already).

Cheers,
Peter

On Aug 16, 2012, at 7:57 AM, ashish <ashi...@gmail.com> wrote:

> Hi,
> I have a following class that I need to test:
>
> public class Abc {
> private ExecutorService eS;
>
> public Abc() {
> eS = Executors.newFixedThreadPool(4);
> }
>
> public boolean process(Request request) {
> Callable c = new SomeCallable(request);
> Future<Boolean> future = eS.submit (c);
> try {
> return future.get().booleanValue();
> } catch (Exception e) {}
> return false;
> }
> }
>
> Now in my Speciication I have something like:
>
> class AbcSpec extends Specification {
> Abc abc
> ExecutorService eS
> Future<Boolean> f
>
> def setup() {
> eS = Mock(ExecutorService)
> f = (Future<Boolean>) Mock (Future)
> f.get() >> Boolean.TRUE
> eS.submit(_) >> f
>
> abc = new Abc();
> }
>
> def "should call submit"() {
> given:
> abc.eS = eS
> when:
> abc.process(request)
> then:
> 1 * eS.submit(_)
> }
> }
>
> Though I am expecting the eS.submit() to return a Mocked Future I get a NPE in the code where it does return future.get().booleanValue() because future returned is null.
>
> How to mock such a code? btw, had this been a Runnable the test works.
>
> Thanks!
>
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