In ViewComponent
object, HttpContext
and User
are read-only properties.
How to unit test such a component?
I'm using the MSTest Freamwork.
The follow properties are used in my code
- Cookie
- Session
- User(System.Security.Principal)
public ViewViewComponentResult Invoke()
{
var vm = new SummaryViewModel();
if (User.Identity is ClaimsIdentity identity && identity.IsAuthenticated)
{
vm.IsAuthenticated = true;
vm.UserName = identity.Claims.FirstOrDefault(c => c.Type == "UserName").Value;
vm.PhotoUrl = identity.Claims.FirstOrDefault(c => c.Type == "FacePicture").Value;
}
return View(vm);
}
[TestMethod]
public void UserSummaryVcTest()
{
var component = new UserSummaryViewComponent();
var model = component.Invoke().ViewData.Model as SummaryViewModel;
Assert.AreEqual("UserName", model.UserName);
}
According to source code the ViewComponent
relies on the ViewComponentContext.ViewContext
to expose those read only properties, Which in turn accesses the HttpContext
. That is your entry point to mock the desired values.
[TestMethod]
public void UserSummaryVcTest() {
// Arrange
var expected = "Username value";
var httpContext = new DefaultHttpContext(); //You can also Mock this
//...then set user and other required properties on the httpContext as needed
var viewContext = new ViewContext();
viewContext.HttpContext = httpContext;
var viewComponentContext = new ViewComponentContext();
viewComponentContext.ViewContext = viewContext;
var viewComponent = new UserSummaryViewComponent();
viewComponent.ViewComponentContext = viewComponentContext;
//Act
var model = viewComponent.Invoke().ViewData.Model as SummaryViewModel;
//Assert
Assert.AreEqual(expected, model.UserName);
}
Here is just a samle for async,
[TestMethod]
public async System.Threading.Tasks.Task InvokeAsyncNameAsync()
{
# setup mocks
...
var httpContext = new DefaultHttpContext();
var viewContext = new ViewContext();
viewContext.HttpContext = httpContext;
var viewComponentContext = new ViewComponentContext();
viewComponentContext.ViewContext = viewContext;
var footerComponent = CreateComponentInstance();
footerComponent.ViewComponentContext = viewComponentContext;
ViewViewComponentResult result = await footerComponent.InvokeAsync() as ViewViewComponentResult;
FooterModel resultModel = (FooterModel)result.ViewData.Model;
....
# do your asserts verifications
Assert.AreEqual(expectedTest, resultModel.FooterText);
}
来源:https://stackoverflow.com/questions/47174028/how-to-unit-test-viewcomponent-invoke