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    copied!<p>I had a lot of trouble to make unit test working with RenderPartialViewToString. I succeeded by doing 2 things. I had to mock the view engine and the controller context.</p> <p>Here the code :</p> <pre><code>public ViewEngineResult SetupViewContent(string viewName, string viewHtmlContent) { var mockedViewEngine = new Mock&lt;IViewEngine&gt;(); var resultView = new Mock&lt;IView&gt;(); resultView.Setup(x =&gt; x.Render(It.IsAny&lt;ViewContext&gt;(), It.IsAny&lt;TextWriter&gt;())) .Callback&lt;ViewContext, TextWriter&gt;((v, t) =&gt; { t.Write(viewHtmlContent); }); var viewEngineResult = new ViewEngineResult(resultView.Object, mockedViewEngine.Object); mockedViewEngine.Setup(x =&gt; x.FindPartialView(It.IsAny&lt;ControllerContext&gt;(), viewName, It.IsAny&lt;bool&gt;())) .Returns&lt;ControllerContext, string, bool&gt;((controller, view, useCache) =&gt; { return viewEngineResult; }); mockedViewEngine.Setup(x =&gt; x.FindView(It.IsAny&lt;ControllerContext&gt;(), viewName, It.IsAny&lt;string&gt;(), It.IsAny&lt;bool&gt;())) .Returns&lt;ControllerContext, string, string, bool&gt;((controller, view, masterName, useCache) =&gt; { return viewEngineResult; }); ViewEngines.Engines.Clear(); ViewEngines.Engines.Add(mockedViewEngine.Object); return viewEngineResult; } public void SetContext(ref PointCollecteLivraisonController controller) { SetupViewContent("MyViewName", "TheViewContent"); var httpContextBase = new Mock&lt;HttpContextBase&gt;(); var httpRequestBase = new Mock&lt;HttpRequestBase&gt;(); var response = new Mock&lt;HttpResponseBase&gt;(); var session = new Mock&lt;HttpSessionStateBase&gt;(); var routes = new RouteCollection(); RouteConfigurator.RegisterRoutes(routes); var routeData = new RouteData(); routeData.Values.Add("controller", "PointCollecteLivraison"); routeData.Values.Add("action", "RechercheJson"); httpContextBase.Setup(x =&gt; x.Response).Returns(response.Object); httpContextBase.Setup(x =&gt; x.Request).Returns(httpRequestBase.Object); httpContextBase.Setup(x =&gt; x.Session).Returns(session.Object); session.Setup(x =&gt; x["somesessionkey"]).Returns("value"); httpRequestBase.Setup(x =&gt; x.Form).Returns(new NameValueCollection()); controller.ControllerContext = new ControllerContext(httpContextBase.Object, routeData, controller); controller.Url = new UrlHelper(new RequestContext(controller.HttpContext, routeData), routes); } </code></pre> <p>And that is the way i use it all :</p> <pre><code>PointCollecteLivraisonController controller = new PointCollecteLivraisonController(); SetContext(ref controller); </code></pre> <p>Here are my sources : View engine mocking : <a href="http://thoai-nguyen.blogspot.fr/2011/04/test-mock-mvc-view-engine.html" rel="nofollow noreferrer">http://thoai-nguyen.blogspot.fr/2011/04/test-mock-mvc-view-engine.html</a></p> <p>Controller context mocking : <a href="https://stackoverflow.com/questions/3621961/asp-net-mvc-unit-testing-renderpartialviewtostring-with-moq-framework">ASP.NET MVC - Unit testing RenderPartialViewToString() with Moq framework?</a></p> <p>Hope this help.</p>
 

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