单元测试异常处理的内部构造第三方例外 [英] Unit testing exception handling for third party exceptions with internal constructors

问题描述

我们使用第三方的库与服务器软件，这是我们不能修改进行沟通。调用库函数可能会失败，抛出类似以下情况除外：

We use a third party library to communicate with their server software, which we can’t modify. Calls to the library can fail, by throwing exceptions similar to the following:

class LibraryException : Exception {
    internal LibraryException() {};
    string ExceptionDetails {public get; internal set; }
}

根据的ExceptionDetails，内容我们调用code具有执行不同的动作（有些错误是致命的，有些则没有），我想对此进行测试code。我的问题是，由于LibraryException有一个内部的构造，我无法找到创建一个方式。我试过new'ing一上来，派生子类，并使用Activator.CreateInstance。有什么办法解决这个工作？

Depending on the contents of ‘ExceptionDetails’, our calling code has to perform different actions (some errors are fatal, others are not), and I would like to test this code. The problem I have is that because ‘LibraryException’ has an internal constructor, I can’t find a way of creating one. I’ve tried new’ing one up, deriving a child class and using Activator.CreateInstance. Is there any way of working around this?

我想过修改构建，因此对于测试，将在一个不同的二进制链接的一个子集，但是这似乎是这将是一个维护的噩梦，所以此刻的区域仅覆盖集成测试

I’ve thought about changing the build, so that for a subset of tests it would link in a different binary, but this seems like it would be a maintenance nightmare, so at the moment the area is only covered by integration tests.

有什么建议？

推荐答案

它应该与 Activator.CreateInstance 使用接受过载时，的BindingFlags ：

it should work with Activator.CreateInstance when using the overload that accepts BindingFlags:

Activator.CreateInstance(typeof(LibraryException),
    BindingFlags.NonPublic | BindingFlags.Instance,
    null,
    null,
    null);

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