尝试为 ASP.Net Core 3.1 单元测试创​​建 Mock.Of<ControllerContext>() 时出错 [英] Error trying to create Mock.Of&lt;ControllerContext&gt;() for ASP.Net Core 3.1 Unit Test

问题描述

根据在 此处 定义的 Moq 快速入门的最后一部分，我正在尝试配置以下 Mock 以将 Form 值传递给被测控制器方法:

As per last section of the Moq Quickstart defined here, I am trying to configure the following Mock in order to pass Form values to the controller method under test:

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;

然而，当运行测试时，它在 Mock.Of<> 行上失败并出现以下错误:

However, when the run the test, it fails on the Mock.Of<> line with the following error:

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

System.NotSupportedException : Unsupported expression: mock => mock.HttpContext

不可覆盖的成员(此处:ActionContext.get_HttpContext)不得用于设置/验证表达式.

Non-overridable members (here: ActionContext.get_HttpContext) may not be used in setup / verification expressions.

我错过了什么?我是不是按照 Quickstart 文档中定义的示例进行操作?

What am I missing? Am I not doing it the same as per the example defined in the Quickstart document?

推荐答案

错误是因为 ControllerContext.HttpContext 属性不是虚拟，因此 Moq 无法覆盖它.

The error is because ControllerContext.HttpContext property is not virtual, so Moq is unable to override it.

考虑使用实际的 ControllerContext 并模拟一个 HttpContext 以分配给属性

Consider using an actual ControllerContext and mocking a HttpContext to assign to the property

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;

//...

甚至使用 DefaultHttpContext 并分配所需的值

Or even using DefaultHttpContext and assign the desired value(s)

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;

//...

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