如何对ViewComponent.Invoke()进行单元测试?

问题描述

在ViewComponent对象中，HttpContext和User是只读属性.

In ViewComponent object, HttpContext and User are read-only properties.

如何对此类组件进行单元测试?

How to unit test such a component?

我正在使用MSTest Freamwork.

I'm using the MSTest Freamwork.

我的代码中使用了以下属性

The follow properties are used in my code

1. 饼干
2. 会话
3. 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);
} 

推荐答案

根据源代码，ViewComponent依赖于ViewComponentContext.ViewContext公开那些只读属性，而后者又访问了HttpContext.这是模拟所需值的入口点.

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);
} 

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