I am attempting to create a unit test for my controller, but the action I am testing uses a partial view to string function which doesn't want to work in my tests.
private string RenderPartialViewToString(string viewName, object model = null)
{
if (string.IsNullOrEmpty(viewName))
viewName = ControllerContext.RouteData.GetRequiredString("action");
ViewData.Model = model;
using (System.IO.StringWriter sw = new System.IO.StringWriter())
{
ViewEngineResult viewResult = ViewEngines.Engines.FindPartialView(ControllerContext, viewName);
ViewContext viewContext = new ViewContext(ControllerContext, viewResult.View, ViewData, TempData, sw);
viewResult.View.Render(viewContext, sw);
return sw.GetStringBuilder().ToString();
}
}
This gives me an error of "Object reference not set to an instance of an object" on the line ViewEngineResult viewResult = ViewEngines.Engines.FindPartialView(ControllerContext, viewName);
My setup in the unit test for the controller is (with a few bits removed to simplify it):
var mock = new Mock<ControllerContext>();
mock.SetupGet(p => p.HttpContext.User.Identity.Name).Returns(userName);
if (userName != null)
{
mock.SetupGet(p => p.HttpContext.Request.IsAuthenticated).Returns(true);
mock.SetupGet(p => p.HttpContext.User.Identity.IsAuthenticated).Returns(true);
}
else
{
mock.SetupGet(p => p.HttpContext.Request.IsAuthenticated).Returns(false);
}
var controller = new BlogController();
controller.ControllerContext = mock.Object;
I've not had any luck trying to find a solution or work around. Any help appreciated. Thanks.
As suggested I have tried setting up route data but still getting the error. This is what I have added:
var routeData = new RouteData();
routeData.Values.Add("controller", "BlogController");
mock.SetupGet(m => m.RouteData).Returns(routeData);
Final solution thanks to help in the comments.
var mock = new Mock<ControllerContext>();
mock.SetupGet(p => p.HttpContext.User.Identity.Name).Returns(userName);
if (userName != null)
{
mock.SetupGet(p => p.HttpContext.Request.IsAuthenticated).Returns(true);
mock.SetupGet(p => p.HttpContext.User.Identity.IsAuthenticated).Returns(true);
}
else
{
mock.SetupGet(p => p.HttpContext.Request.IsAuthenticated).Returns(false);
}
var routeData = new RouteData();
routeData.Values.Add("controller", "BlogController");
mock.SetupGet(m => m.RouteData).Returns(routeData);
var view = new Mock<IView>();
var engine = new Mock<IViewEngine>();
var viewEngineResult = new ViewEngineResult(view.Object, engine.Object);
engine.Setup(e => e.FindPartialView(It.IsAny<ControllerContext>(), It.IsAny<string>(), It.IsAny<bool>())).Returns(viewEngineResult);
ViewEngines.Engines.Clear();
ViewEngines.Engines.Add(engine.Object);
var controller = new BlogController();
controller.ControllerContext = mock.Object;
Here's a version using AutoMoq that renders a string of your choice.
Subject.ControllerContext = new ControllerContext(
Mocked<HttpContextBase>().Object,
new RouteData(),
Subject);
ViewEngines.Engines.Clear();
ViewEngines.Engines.Add(Mocked<IViewEngine>().Object);
Mocked<IViewEngine>()
.Setup(x => x.FindPartialView(Subject.ControllerContext,
It.IsAny<string>(), It.IsAny<bool>()))
.Returns(new ViewEngineResult(Mocked<IView>().Object,
Mocked<IViewEngine>().Object));
Mocked<IView>()
.Setup(x => x.Render(It.IsAny<ViewContext>(), It.IsAny<TextWriter>()))
.Callback((ViewContext c, TextWriter w) => w.WriteLine("RENDERED"));
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