App.config in Test Projects

Question

I'm building an ASP.NET app in VS2010. I have a number of separate assemblies (class libraries) and corresponding Test projects for each.

In one of the class libraries I use an App.config file to store settings. The assembly itself uses the following code to retrieve settings:

 string tmp = ConfigurationManager.AppSettings["mySetting"]; 

The problem is that when I try to create a Unit Test in a separate test project, the test does not pick up the setting in the App.config file. If I COPY the App.config file into the Test project, it works.

How can I ensure that each assembly uses its own copy of an App.config file. It would introduce problems if I had to copy config files around. There's an additional problem because there may be multiple config files, one per assembly - how could they all co-exist in a single test project anyway?

Thanks!

Answer 1

Well, if you need a App.config file shared across several projects, I would simply "Add as Link" the original App.config file in each project.

Let's say you have ProjectA with the original App.config. Then you have ProjectATest1 and ProjectATest2. In each of the TestX project:

1. right click on the solution name in Visual Studio
2. select "Add Existing Item"
3. navigate to the ProjectA App.config and select it
4. click in the "Add" button down arrow
5. select "Add as Link"

It'll create a App.config shortcut in each TestX project. If you change it, it will change everywhere.

Hope this helps.