模擬WCF客戶端代理的最佳方法

Question

有沒有什麼方法可以模仿使用Rhino mocks框架的WCF客戶端代理，因此我可以訪問Channel屬性？我試圖單元測試Proxy.Close（）方法，但由於代理是使用具有ICommunicationObject接口的抽象基類ClientBase<T>構造的，所以我的單元測試失敗，因爲類的內部基礎結構在模擬對象中不存在。任何代碼示例的好方法將不勝感激。

Answer 1

您可以做的是創建一個繼承原始服務接口和ICommunicationObject的接口。然後，您可以綁定並嘲諷該接口，並仍然具有所有重要的方法。

例如：

public interface IMyProxy : IMyService, ICommunicationObject 
{ 
    // Note that IMyProxy doesn't implement IDisposable. This is because 
    // you should almost never actually put a proxy in a using block, 
    // since there are many cases where the proxy can throw in the Dispose() 
    // method, which could swallow exceptions if Dispose() is called in the 
    // context of an exception bubbling up. 
    // This is a general "bug" in WCF that drives me crazy sometimes. 
} 

public class MyProxy : ClientBase<IMyService>, IMyProxy 
{ 
    // proxy code 

} 

public class MyProxyFactory 
{ 
    public virtual IMyProxy CreateProxy() 
    { 
     // build a proxy, return it cast as an IMyProxy. 
     // I'm ignoring all of ClientBase's constructors here 
     // to demonstrate how you should return the proxy 
     // after it's created. Your code here will vary according 
     // to your software structure and needs. 

     // also note that CreateProxy() is virtual. This is so that 
     // MyProxyFactory can be mocked and the mock can override 
     // CreateProxy. Alternatively, extract an IMyProxyFactory 
     // interface and mock that. 
     return new MyProxy(); 
    } 
} 

public class MyClass 
{ 
    public MyProxyFactory ProxyFactory {get;set;} 
    public void CallProxy() 
    { 
     IMyProxy proxy = ProxyFactory.CreateProxy(); 
     proxy.MyServiceCall(); 
     proxy.Close(); 
    } 
} 


// in your tests; been a while since I used Rhino 
// (I use moq now) but IIRC...: 
var mocks = new MockRepository(); 
var proxyMock = mocks.DynamicMock<IMyProxy>(); 
var factoryMock = mocks.DynamicMock<MyProxyFactory>(); 
Expect.Call(factoryMock.CreateProxy).Return(proxyMock.Instance); 
Expect.Call(proxyMock.MyServiceCall()); 
mocks.ReplayAll(); 

var testClass = new MyClass(); 
testClass.ProxyFactory = factoryMock.Instance; 
testClass.CallProxy(); 

mocks.VerifyAll();