C# 如何使用HttpContext创建单元测试，以便在方法内部进行授权？

这是我的密码：

public static ApiResponseBase BookActivity(ActivityBookApiRequest request)
        {
            var user = HttpContext.Current.User;
            if (string.IsNullOrEmpty(user.Identity.Name))
            {
                return new ActivityBookApiResponse
                {
                    StatusCode = HttpStatusCode.Unauthorized,
                    ErrorCode = "ERAGPR01"
                };
            }
            return null;
        }

如何为该代码创建单元测试

我是通过单元测试创建的，但仍然失败，因为在

HttpContext.Current.User上出现了给定错误：

System.NullReferenceException:对象引用未设置为实例
指一个物体

下面是我的单元测试：

        [TestMethod]
        public void Book_Null_ReturnBadRequest()
        {
            var expectedResult = new ActivityBookApiResponse
            {
                StatusCode = HttpStatusCode.Unauthorized,
                ErrorCode = "ERAGPR01"
            };
            var actualResult = ActivityLogic.BookActivity(null);
            Assert.AreEqual(expectedResult.StatusCode, actualResult.StatusCode);
            Assert.AreEqual(expectedResult.StatusCode, actualResult.StatusCode);
        }

HttpContext.Current
是静态的，可以分配：

HttpContext.Current = new HttpContext(
    new HttpRequest("", "http://tempuri.org", ""),
    new HttpResponse(new StringWriter())
    );

// User is logged in
HttpContext.Current.User = new GenericPrincipal(
    new GenericIdentity("username"),
    new string[0]
    );

// User is logged out
HttpContext.Current.User = new GenericPrincipal(
    new GenericIdentity(String.Empty),
    new string[0]
    );

代码来自