对具有 MEF 导入值的类进行单元测试

发布于 2024-09-17 21:28:50 字数 768 浏览 4 评论 0原文

我有一个名为“ViewFactory”的类，该类现在应该提供正确的视图，

它只有一个方法（并且它会增长），我想针对该方法编写单元测试。

该类看起来像这样...

  public class ViewFactory
{

       [ImportMany(AllowRecomposition=true)]
    IEnumerable<ExportFactory<DependencyObject, IViewMetaData>> Views { get; set; }

    public DependencyObject GetViewByName(string name)
    {
        DependencyObject view = null;

        try
        {
            view = Views.Where(v => v.Metadata.ViewName == name).FirstOrDefault().CreateExport().Value;
            return view;
        }
        catch (Exception ex)
        {

            return view;
        }
    }
}

我真正想要的是测试我的方法，但不知道该怎么做，因为视图列表是在运行时组成的...

我想测试我是否获得有效的视图姓名和我还想测试如果我的名称无效，我是否会得到 null

正确的方法是什么？

原文

I have a a class called "ViewFactory" and this class should deliver the right view

right now it has only one method (and it will grow) which I want to write a unit test against.

the class looks like this...

  public class ViewFactory
{

       [ImportMany(AllowRecomposition=true)]
    IEnumerable<ExportFactory<DependencyObject, IViewMetaData>> Views { get; set; }

    public DependencyObject GetViewByName(string name)
    {
        DependencyObject view = null;

        try
        {
            view = Views.Where(v => v.Metadata.ViewName == name).FirstOrDefault().CreateExport().Value;
            return view;
        }
        catch (Exception ex)
        {

            return view;
        }
    }
}

what I do want is to test my method but don't know how to do it because the List of Views is composed on runtime...

I want to test if I get a view for a valid name
and
I also want to test if I get null if I have an invalid name

What would be the right way?

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一笑百媚生 2024-09-24 21:28:50

您将为 ViewFactory 提供一组适合特定测试的 ExportFactory<,> 值。不同的测试可能有不同的集合，以允许您测试不同的东西。基本上你是在伪造注入的依赖关系。

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铃予 2024-09-24 21:28:50

这是代码（针对 Silverlight）

var viewFactory = new ViewFactory();

// Satisfy the imports manually (No MEF in unit tests!)
var factories = new List<ExportFactory<DependencyObject, IViewMetaData>>();
var tuple = new Tuple<DependencyObject, Action>(new MyObject(), () => { });
var metaData = new MyViewMetaData();
var factory = new ExportFactory<DependencyObject, IViewMetaData>(() => tuple, metaData);
factories.Add(factory);
viewFactory.Views = factories;

Here's the code (for Silverlight)

var viewFactory = new ViewFactory();

// Satisfy the imports manually (No MEF in unit tests!)
var factories = new List<ExportFactory<DependencyObject, IViewMetaData>>();
var tuple = new Tuple<DependencyObject, Action>(new MyObject(), () => { });
var metaData = new MyViewMetaData();
var factory = new ExportFactory<DependencyObject, IViewMetaData>(() => tuple, metaData);
factories.Add(factory);
viewFactory.Views = factories;

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