Can nunit be configured to drop the app domain per fixture (or per test)

Question

In testing singleton classes we need the single instance to "go away" after each test. Is there a way to configure nunit to recreate the test app domain after each test, or at least after each fixture?

Answer 1

You could provide the means to renew the singleton instance when testing via a conditional method.

//  CUT
public sealed class Singleton{

    private static Singleton _instance = new Singleton();

    private Singleton()
    {
         //  construct.
    }

    public static Singleton Instance{
        get{
            return _instance;
        }
    }

    [Conditional ("DEBUG")]
    public static void FreshInstance (){
          _instance = new Singleton();
    }
}


//  NUnit
[TestFixture]
public class SingletonTests{

    [SetUp]
    public void SetUp(){
        Singleton.FreshInstance();
    }
}