c# - 如何模拟 HttpContext.User

Question

我正在处理一个 Asp.net MVC 5 项目，我正在尝试设置一个模拟以在 Controller 中返回一个自定义主体。我已经搜索并尝试了建议的不同方法，但没有一个有效。

我有一个 BaseController，我的所有 Controller 都继承自它。 BaseController 有一个 User 属性，它在 getter 中返回 HttpContext.User。 HttpContext.user 在项目内调用时返回一个值，但在从单元测试项目调用时返回 null。

基础 Controller

public class BaseController : Controller
{
    protected virtual new CustomPrincipal User
    {
        get { return HttpContext.User as CustomPrincipal; }  ***<== Line with issue***
    }
}

自定义主体

public class CustomPrincipal : IPrincipal, ICustomPrincipal
{
    public IIdentity Identity { get; private set; }

    public string UserId { get; set; }
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public bool   IsStoreUser { get; set; }

    public CustomPrincipal(string username)
    {
        this.Identity = new GenericIdentity(username);
    }
}

Controller

public class DocumentsController : BaseController
    {
        public ViewResult ViewDocuments()
        {
            var userType = User.IsStoreUser ? UserType.StoreUser : UserType.Corporate;  ***<== User is null when calling from a unit test.***
        }
    }

测试用例

[Test]
public void ViewDocuments_WhenCalled_ShouldReturnViewModel()
{
    // Arrange
    var principal = new CustomPrincipal("2038786");
    principal.UserId = "2038786";
    principal.FirstName = "Test";
    principal.LastName = "User";
    principal.IsStoreUser = true;

    var _mockController = new Mock<DocumentsController>(new UnitOfWork(_context)) { CallBase = true };
        _mockController.Setup(u => u.User).Returns(principal);  ***<== Error - "Invalid setup on a non-virtual (overridable in VB) member: u => u.User"***

    // Act
    var result = _controller.ViewDocuments();
}

我正在使用 nUnit 和 Moq 来创建模拟对象，但我不确定我做错了什么。我需要在 DocumentControl 中模拟 User.IsStore 的返回，以在我在测试中创建的自定义主体对象中返回 IsStore 的值。

Answer 1

制作一个模拟的http上下文

private class MockHttpContext : HttpContextBase {
    private readonly IPrincipal user;

    public MockHttpContext(IPrincipal principal) {
        this.user = principal;
    }

    public override IPrincipal User {
        get {
            return user;
        }
        set {
            base.User = value;
        }
    }
}

相应地安排测试。

[Test]
public void ViewDocuments_WhenCalled_ShouldReturnViewModel() {
    // Arrange
    var principal = new CustomPrincipal("2038786");
    principal.UserId = "2038786";
    principal.FirstName = "Test";
    principal.LastName = "User";
    principal.IsStoreUser = true;

    var mockUoW = new Mock<IUnitOfWork>();
    //...setup UoW dependency if needed
    var controller = new DocumentsController(mockUoW.Object);
    controller.ControllerContext = new ControllerContext {
        Controller = controller,
        HttpContext = new MockHttpContext(principal)
    };

    // Act
    var result = controller.ViewDocuments();

    //Assert
    //...assertions
}

不要模拟被测系统。模拟它的依赖关系。