Use the Facade Pattern (http://www.dofactory.com/Patterns/PatternFacade.aspx)
to wrap the ConfigurationManager in an interface that you can then mock and
set proper expectations upon.
public interface IManageConfigSettings
{
CultureConstant GetCulture();
}
public class MyAppsConfigManager : IManageConfigSettings
{
public CultureConstant GetCulture()
{
return ConfigurationManager.AppSettings[Constants.CultureToUse];
}
}
In your tests, inject a mocked IManageConfigSettings and set your
expectation on it.
In general, you should do this anyway (Facade Pattern around annoying bits
of the Framework) as an overall design strategy for your application so that
you don't take a concrete dependency on the ConfigurationManager class in
100s of places throughout your code. As an example, what would happen if
you later decide to store current culture settings per user in a database
somewhere? You want to be able to update *only* the MyAppConfigManager
class' GetCulture() method in one place rather than having to reach all over
your application to change calls to
ConfigurationManager.AppSettings[Constants.CultureToUse] everywhere :)
Best of luck,
Steve Bohlen
[email protected]
http://blog.unhandled-exceptions.com
http://twitter.com/sbohlen
On Fri, Dec 10, 2010 at 4:50 AM, Desmond Green <[email protected]>wrote:
> I am trying to write meaningful tests, using MSTest for the following
> method:
>
> public bool CheckDateFormat()
> {
> return
> (String.Compare(ConfigurationManager.AppSettings[Constants.CultureToUse],
> Constants.UK, true) == 0);
> }
>
> To do so, I want to check the expected path (with the value 'en-GB'
> returned from app.config) as well as negative paths where the value is
> different within the app.config file or where no value is present.
>
> I do not want to have to dynamically add, remove or modify values
> within the app.config file, but hoped that I could achieve my tests by
> mocking ConfigurationManager. However, since the method is effectively
> a 'black box' and encapsulates the use of ConfigurationManager, how
> can I write MSTest code to do this?
>
> Thank you.
>
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