如何使用IMvxMessenger对MvvmCross进行单元测试

Question

我正在使用Xamarin Studio使用MvvmCross开始TDD.我首先尝试测试发布的消息对视图模型的影响,以便仅在收到相应的消息时才执行逻辑.

我已经将Stuart的一些优秀教程混合在一起,导致成功传播位置数据,以查看模型,然后在IOS视图上更新一些文本控件,地图标记等.

但在我进一步深入研究之前,我想使用TDD进行编码.如何人工设置viewmodel并在我的测试工具中人为地将消息发布到它？:

public class MyViewModel : MvxViewModel
{
    private readonly MvxSubscriptionToken _token;

    public MyViewModel(ILocationService service, IMvxMessenger messenger)
    {
        //weak reference
        _token = messenger.Subscribe<LocationMessage>(OnLocationMessage);
    }

    private void OnLocationMessage(LocationMessage locationMessage)
    {
        Lat = locationMessage.Lat;
        Lng = locationMessage.Lng;
        // Console.WriteLine("on loc msg {0:0.0000}, {1:0.0000}", Lat, Lng);
    }

    private double _lng;
    public double Lng
    {
        get { return _lng; }
        set
        {
            _lng = value;
            RaisePropertyChanged(() => Lng);
        }
    }

    private double _lat;
    public double Lat
    {
        get { return _lat; }
        set
        {
            _lat = value;
            RaisePropertyChanged(() => Lat);
        }
    }
}


[TestFixture()]
public class LocTest
{
    [Test()]
    public void LocationMessageIsRecieved()
    {
        // im using nsubstitute to mock with
        var locService = Substitute.For<ILocationService>();  
        var msgr = Substitute.For<IMvxMessenger>();
        var vm = new Map2ViewModel(locService, msgr);

        var locMsg = new LocationMessage(this, 1F, 2F);
        msgr.Publish(locMsg);

        var lat = vm.Lat;
        Assert.AreEqual(2F, lat);  // says lat is 0.0  and nunit doesnt let me debug the tests :(
    }
}

有关MvvmCross的TDD的任何精彩教程都会很棒

Answer 1

有关MvvmCross的TDD的任何精彩教程都会很棒

Greg Shackles在Evolve的演讲是一个很好的起点 - http://xamarin.com/evolve/2013#session-7wb0etd3r8

他的CodeCamp示例包含一组极好的单元测试示例 - http://www.gregshackles.com/2013/09/nyc-code-camp-8-mobile-apps/导致https://github.com/gshackles/ NycCodeCamp8 /树/主/ CodeCamp.Core /测试/ CodeCamp.Core.Tests/ViewModelTests

关于MvvmCross单元测试的教程 - 包括模拟 - 可在N = 29的http://mvvmcross.wordpress.com/上获得.

博客文章也可在http://blog.fire-development.com/2013/06/29/mvvmcross-enable-unit-testing/上找到.