尝试为 ASP.Net Core 3.1 单元测试创​​建 Mock.Of() 时出错

根据最小起订量快速入门的最后一部分定义here，我尝试配置以下模拟，以便将表单值传递给被测试的控制器方法：

var formCollection = new FormCollection(
                new System.Collections.Generic.Dictionary<string, Microsoft.Extensions.Primitives.StringValues>()
            {
                    {"mAction", "someAction" },
                    {"mRefId", "0" }
            });

        var controllerContext = Mock.Of<ControllerContext>(ctx =>
            ctx.HttpContext.Request.Form == formCollection);
        
        controller.ControllerContext = controllerContext;

但是，当运行测试时，它失败了Mock.Of<>出现以下错误：

System.NotSupportedException：不支持的表达式：mock => mock.HttpContext

不可重写的成员（此处：ActionContext.get_HttpContext）不得在设置/验证表达式中使用。

我缺少什么？我是否按照快速入门文档中定义的示例执行相同的操作？

错误是因为ControllerContext.HttpContext财产不是virtual，因此 Moq 无法覆盖它。

考虑使用实际的ControllerContext并嘲笑一个HttpContext分配给该属性

var formCollection = new FormCollection(new Dictionary<string, StringValues>()
    {
        {"mAction", "someAction" },
        {"mRefId", "0" }
    });

var controllerContext = new ControllerContext() {
    HttpContext = Mock.Of<HttpContext>(ctx => ctx.Request.Form == formCollection)
};

controller.ControllerContext = controllerContext;

//...

或者甚至使用DefaultHttpContext并分配所需的值

var formCollection = new FormCollection(new Dictionary<string, StringValues>()
    {
        {"mAction", "someAction" },
        {"mRefId", "0" }
    });

HttpContext httpContext = new DefaultHttpContext();
httpContext.Request.Form = formCollection;

var controllerContext = new ControllerContext() {
    HttpContext = httpContext
};

controller.ControllerContext = controllerContext;

//...