public void Should_set_preferences_object()
        {
            IAppState setState = null;
            var       storage  = new Mock <IStorageProvider>();

            storage.Setup(s => s.SetAppState(It.IsAny <IAppState>())).Returns <IAppState>((p) =>
            {
                setState = p;
                return(true);
            });

            var state   = new AppState();
            var service = new AppStateService(storage.Object, new Mock <IMapper>().Object);

            service.Save(state);
            setState.Should().Be(state);
        }