title: How do I integration testing to my code written using the ASP.NET Provider Model?
body: <p>I'm fairly new to unit testing.  I have a site built in the 3-tier architecture, UI -> BLL -> DAL.  And I used the asp.net Provider Model, so by making changes to web.config I can switch to DAL dll to target different data sources, to be complete the DAL is written with Entity Framework.</p>
  
  <p>Now, my question is how do I unit test my BLL?  I use NUnit.</p>
  
  <p>If run/debug my site, the asp.net/IIS loads everything and gets the correct configuration from web.config, so things work, that is because the entry point is from IIS.  Now if I use NUnit gui to test and say I have my test project "MySite.Test.dll" which have test cases to my BLL, how does the testing framework get the correct configuration to successfully run all the test.  It needs the info in web.config to load the correct provider!</p>
  
  <p>Now, in my DAL there is a App.config created there by EntityFramework, and in it there is just the connectionString.  Should I put all the provider related configuration in this app.config? Or am I missing some big picture on how to correctly do this?</p>
  
  <p>This should be a common thing I imagine people need to do constantly.  Could someone give some detail on how do I unit test my lib.  </p>
  
  <p>Thank you,
  Ray.</p>
  
  <hr>
  
  <p>Edit:  After reading the first 2 answers I think I should correct my description with integration testing.  Basically instead of IIS as the entry point, use GUI tools like the NUnit to run and test my code through, so NUnit -> BLL -> DAL.  How do people actually set it up?</p>
  
  <p>Thanks,
  Ray.</p>