public void SaveWritesModuleSettingsToConfig()
        {
            // Arrange
            var notifi = new NotificationConfig
            {
                PopupEnabled  = true,
                SoundEnabled  = false,
                ToastsEnabled = false
            };

            var cfg = new Mock <IConfig>();

            cfg.SetupGet(c => c.Notifications).Returns(notifi);

            var vm = new NotificationSettings(cfg.Object);

            // Act
            vm.AvailableNotifications.First(n => n.Enabled).Enabled = false;
            vm.SaveTo(cfg.Object);

            // Assert
            Assert.AreEqual(false, notifi.PopupEnabled);
        }