[英]How can I fake HttpContext for unit tests?
我需要偽造HttpContext.Current.Application
表,以便從我的單元測試中訪問它。
我需要將我的數據存儲在某個地方。 我認為我可以只傳遞NameValueCollectionBase
實例但是因為我發現這個基類型沒有索引器所以它看起來太復雜了。
那么偽裝這部分HttpContext
怎么樣? 可能嗎? 我該怎么做? 會對NUnit.Mocks
有幫助嗎?
先感謝您...
如果您需要namevaluecollection base的索引,請使用以下代碼
public static IEnumerable<KeyValuePair<string, string>> ToPairs(this NameValueCollection collection)
{
if(collection == null)
{
throw new ArgumentNullException("collection");
}
return collection.Cast<string>().Select(key => new KeyValuePair<string, string>(key, collection[key]));
}
如需存儲數據和傳遞測試方法,請使用上面的代碼。
在這種情況下,我生成一些從System.Web.Abstractions中的基類派生的存根。 我經常將此技術用於MVC應用程序,因為MVC / WebApi控制器包含對HttpContext(HttpContextBase)的抽象
這樣我可以在我的單元/集成測試中存根HttpContext要求,這是一個示例......
public class MockHttpApplicationState : HttpApplicationStateBase
{
private IDictionary<string, object> _appState = new Dictionary<string, object>();
public override void Add(string name, object value)
{
_appState.Add(name, value);
}
public override object Get(string name)
{
return _appState[name];
}
public override object this[string name]
{
get
{
return _appState[name];
}
set
{
_appState[name] = value;
}
}
}
public class MockHttpContext : HttpContextBase
{
private IDictionary<string, object> _appKeys;
public MockHttpContext()
{
}
/// <summary>
/// Accepts a dictionary of app keys to supply to the HttpApplicationState instance
/// </summary>
/// <param name="applicationState"></param>
public MockHttpContext(IDictionary<string,object> applicationState)
{
_appKeys = applicationState;
}
public override Cache Cache
{
get
{
return HttpRuntime.Cache;
}
}
public override HttpApplicationStateBase Application
{
get
{
var mockAppState = new MockHttpApplicationState();
foreach (string key in _appKeys.Keys)
{
mockAppState.Add(key, _appKeys[key]);
}
return mockAppState;
}
}
public override HttpRequestBase Request
{
get
{
return new HttpRequestWrapper(new HttpRequest(null,"http://localhost",null));
}
}
}
然后我的測試可以建立Controller和Http Context:
private readonly OnlineShop.MVC.Controllers.HomeController _controller =
new MVC.Controllers.HomeController(null,new UnitOfWork());
[OneTimeSetUp]
public void Init()
{
var appKeys = new Dictionary<string, object>();
appKeys.Add("localhost", 1);
var httpContext = new MockHttpContext(appKeys);
_controller.ControllerContext = new ControllerContext()
{
Controller = _controller,
RequestContext = new RequestContext(httpContext, new RouteData())
};
}
[Test]
public void Index_Returns_HomeView()
{
var view = _controller.Index() as ViewResult;
var viewModel = view.Model as MVC.ViewModels.Home;
Assert.IsInstanceOf<OnlineShop.MVC.ViewModels.Home>(viewModel);
Assert.IsTrue(viewModel.FeaturedProducts.Count > 0);
}
我的控制器知道它提供緩存和應用程序狀態的環境HttpContextBase實例:
public ActionResult Index()
{
string cacheKey = string.Format("FeaturedProducts-{0}",WebsiteId);
IList<Product> productList = this.HttpContext.Cache[cacheKey] as IList<Product>;
//My app keeps a list of website contexts in the Application. This test returns 1 based on the unit / int tests or a real world db value when hosted on IIS etc..
int websiteId = (int)HttpContext.Application[this.Request.Url.Host];
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