Im trying to get to grips with using the NUnit framework.

Current structure:

![enter image description here](https://i.stack.imgur.com/Zhfo7.jpg)

Note that 'NUnitStackHandler' is my class library.

At the moment I'm getting into a bit of a mess with how to go about this the right way. 

My situation is I have a c# winform with a single c# class. This class holds my methods and I then have another class library file that holds my tests - these test are the methods that have been built to go into the class file.

The situation im having is I cant seem to keep hold of the built DLL file. When i open NUnit and search for the DLL it is gone from the 'bin' folder and all I'm left with is a exe app file.

Can someone tell me if i should be referencing the DLL test methods and using them in my project instead of a separate c# file with the exact same methods?