MvcMailer单元测试信息：System.ArgumentNullException的HttpContext不能为空 [英] MvcMailer unit tests: System.ArgumentNullException httpContext cannot be null

问题描述

我无法成功运行使用Visual Studio的测试套件和起订量为MvcMailer单元测试。
我从字维基字复制的例子，但每次都获得以下异常：

I cannot successfully run unit tests for MvcMailer using the visual studio test suite and Moq. I have copied the example from the wiki word for word but get the following exception every time:

Test method MvcMailerTest.Tests.MailerTest.TestMethod1 threw exception: 
System.ArgumentNullException: Value cannot be null.
Parameter name: httpContext

code如下：（使用VS单元测试框架 - 使用NUnit作为例子，当完全相同的错误）

Code is as follows: (Using the VS unit test framework - exact same error when using nUnit as in the example)

        //Arrange: Moq out the PopulateBody method
        var _userMailerMock = new Mock<UserMailer>();
        _userMailerMock.Setup(mailer => mailer.PopulateBody(It.IsAny<MailMessage>(), "Welcome", null));            
        _userMailerMock.CallBase = true;

        //Act
        var mailMessage = _userMailerMock.Object.Welcome();

这是在欢迎（）方法，下面的行失败（复制直接从维基）：

Fails on the following line in the Welcome() method (copied straight out of the wiki):

 PopulateBody(mailMessage, viewName: "Welcome");

维客是在这里：<一href=\"https://github.com/smsohan/MvcMailer/wiki/MvcMailer-Step-by-Step-Guide\">https://github.com/smsohan/MvcMailer/wiki/MvcMailer-Step-by-Step-Guide

类似的（几乎完全一样）问题：<一href=\"http://stackoverflow.com/questions/5575964/mvcmailer-cant-complete-nunit-tests-on-razor-views-which-use-url-action\">MvcMailer:无法完成上使用Url.Action

Similar (almost exactly the same) Question: MvcMailer: Can't complete NUnit tests on Razor Views which use Url.Action

任何人都知道如何解决/解决这个问题？链接的问题，说我需要模拟出这是我做了（根据维基）的PopulateBody方法。

Anyone know how to fix/get around this? The linked question says I need to mock out the PopulateBody method which I have done (as per wiki).

推荐答案

一个解决方法是改变你的code这样：

a workaround is to change your code to this:

PopulateBody（MAILMESSAGE，欢迎光临，NULL）;

这会工作，因为你有PopulateBody那过载和一个模拟设置不为它的2参数版本。

This will work because you have a mock setup for that overload of PopulateBody and not for the 2 parameter version of it..

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