testRepo.save(actualValue).flatMap(new Function() {
            @Override
            public Single apply(@NonNull Object o) throws Exception {
                Log.v("tag_info", "save success");
                return testRepo.first(null);
            }
        }).subscribe(new Consumer() {
            @Override
            public void accept(Object o) throws Exception {
                Log.v("tag_info", "get success");
            }
        });