Kiwi で非同期テストを行う ref: http://qiita.com/items/38b66294e5c0bc46d214

test.m

SPEC_BEGIN(PropertyUtil)

describe(@"SimpleRemoteObject", ^{
    context(@"read timeout", ^{
        beforeAll(^{
            [SRRemoteConfig defaultConfig].baseurl = @"http://localhost:2000/";
            [SRRemoteConfig defaultConfig].timeout = 2;
        });

        it(@"should timeout with specified second", ^{
            __block NSError *ret;
            [TimeoutObj fetchAsync:^(NSArray *allRemote, NSError *error) {
                ret = error;
            }];
            [[expectFutureValue(ret) shouldEventuallyBeforeTimingOutAfter(3.0)] beNonNil];
            [[expectFutureValue(ret.localizedDescription) shouldEventuallyBeforeTimingOutAfter(3.0)] equal:@"The request timed out."];
        });
    });
});

SPEC_END