Moq單元測試生成器模式

Question

我正在使用生成器模式爲控制器生成viewmodels，並且當我嘗試單元測試我的控制器時，發現自己無法這樣做。 Moq抱怨。

不確定這是Moq限制還是我自己的限制和無知。

這是我的控制器是什麼樣子：

public class OutletController : Controller 
{ 
    private readonly IOutletViewModelBuilder _builder; 

    public OutletController(IOutletViewModelBuilder builder) 
    { 
     this._builder = builder; 
    } 


    public ActionResult Edit(int id) 
    { 
     OutletViewModel viewModel = this._builder.WithOutlet(id).WithCountryList().Build(); 

     return View(viewModel); 
    } 
} 

我試圖嘲弄IOutletViewModelBuilder對象，但是這是我得到：

[Test] 
public void DummyTest() 
{ 
    Mock<IOutletViewModelBuilder> mockBuilder = new Mock<IOutletViewModelBuilder>(); 
    // (1) // mockBuilder.Setup(m => m.WithOutlet(It.IsAny<int>())).Returns(mockBuilder.Object); 
    // (2) //mockBuilder.Setup(m => m.WithOutlet(It.IsAny<int>())).Returns(mockBuilder); 

    // (3) // mockBuilder.Setup(m => m.WithOutlet(It.IsAny<int>()).WithCountryList().Build()).Returns(new OutletViewModel()); 

    OutletController controller = new OutletController(mockBuilder.Object); 
    ActionResult result = controller.Edit(1); 

    Assert.IsTrue(true); 
} 

（1）給我以下錯誤突出顯示（mockBuilder.Object）

無法解析方法'返回（ViewModelBuilders.Builders.IOutletViewModelBuilder）'，考生是：

Moq.Language.Flow.IReturnsResult<ViewModelBuilders.Builders.IOutletViewModelBuilder> Returns(System.Func<ViewModelBuilders.Builder.IOutletViewModelBuilder>) (in interface IReturns<IOutletViewModelBuilder,OutletViewModelBuilder>) 
Moq.Language.Flow.IReturnsResult<ViewModelBuilders.Builders.IOutletViewModelBuilder> Returns(ViewModelBuilders.Builders.OutletViewModelBuilder) (in interface IReturns<IOutletViewModelBuilder,OutletModelBuilder>) 

（2）引發以下錯誤：

無法解析法 '返回（Moq.Mock）'，考生是：

Moq.Language.Flow.IReturnsResult<ViewModelBuilders.Builders.IOutletViewModelBuilder> Returns(System.Func<ViewModelBuilders.Builders.OutletViewModelBuilder>) (in interface IReturns<IOutletViewModelBuilder,OutletViewModelBuilder>) 
Moq.Language.Flow.IReturnsResult<ViewModelBuilders.Builders.IOutletViewModelBuilder> Returns(ViewModelBuilders.Builders.OutletViewModelBuilder) (in interface IReturns<IOutletViewModelBuilder,OutletViewModelBuilder>) 

（3）不會拋出一個編譯時錯誤，但運行時一個：

System.NotSupportedException : Invalid setup on a non-virtual (overridable in VB) member: m => m.WithOutlet(It.IsAny<Int32>()).WithCountryList().Build() 
at Moq.Mock.ThrowIfCantOverride(Expression setup, MethodInfo method) 
at Moq.Mock.<>c__DisplayClass1c`2.<Setup>b__1b() 
at Moq.Mock.Setup(Mock mock, Expression`1 expression, Func`1 condition) 
at ViewModelBuilderTests.OutletControllerTest.DummyTest() 

任何幫助將不勝感激。單元測試這個方法應該不是很難嗎？

下面你可以看到Builder對象，以防你需要看到實現。

public class OutletViewModelBuilder 
{ 
    private readonly IRepository _repository; 
    private OutletViewModel _viewModel; 

    public OutletViewModelBuilder(IRepository repository) 
    { 
     this._repository = repository; 
     this._viewModel = new OutletViewModel(); 
    } 

    public OutletViewModel Build() 
    { 
     return this._viewModel; 
    } 

    public OutletViewModelBuilder WithOutlet(int outletId) 
    { 
     this._viewModel.Outlet = this._repository.GetOutletById(outletId); 

     return this; 
    } 

    public OutletViewModelBuilder WithCountryList() 
    { 
     this._viewModel.CountryList = this._repository.GetCountryList(); 

     return this; 
    } 
} 

最後，IOutletViewModelBuilder接口

public interface IOutletViewModelBuilder 
{ 
    OutletViewModel Build(); 

    OutletViewModelBuilder WithOutlet(int outletId); 

    OutletViewModelBuilder WithCountryList(); 
} 

Answer 1

它看起來像的主要問題是，你的WithOutlet和WithCountryList方法返回一個具體OutletViewModelBuilder，而不是返回一個IOutletViewModelBuilder。我認爲你需要像這樣：

public interface IOutletViewModelBuilder 
{ 
    OutletViewModel Build(); 
    IOutletViewModelBuilder WithOutlet(int outletId); 
    IOutletViewModelBuilder WithCountryList(); 
} 

那麼你的嘲弄：

var myViewModel = TheOutletViewModelForTesting(); 
var mockBuilder = new Mock<IOutletViewModelBuilder>(); 

mockBuilder.Setup(m => m.WithOutlet(It.IsAny<int>())).Returns(mockBuilder.Object); 
mockBuilder.Setup(m => m.WithCountryList()).Returns(mockBuilder.Object); 
mockBuilder.Setup(m => m.Build()).Returns(myViewModel); 

// rest of your test that validates that myViewModel is passed correctly to your view