I am creating one web application which has structure as shown in following image:

I have all entities and datastore files in the App_Code folder. i.e no separate project layer is created. I want to use Nunit for unit testing. But as for NUnit testing I need projectname.dll and my web application will not create dll I don't know how to test my methods.
If I create a separate project for unit tests, I can not reference datastore and other files in that project. Kindly suggest how can I use Nunit in this case.
 
     
     
    