title: 'Configuration' does not contain a definition for 'GetConnectionString'
body: <p>I'm writing the code for our integration suite and using this example: <a href="https://docs.microsoft.com/en-us/aspnet/core/test/integration-tests?view=aspnetcore-3.1#sut-environment" rel="nofollow noreferrer">integration tests dotnet core</a></p>
  
  <p>I'm trying to implement the piece that allows for a real db to be used in the tests, but I keep getting the error that Configuration does not contain a definition for GetConnectionString
  <a href="https://i.stack.imgur.com/Xlf0D.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Xlf0D.png" alt="enter image description here"></a></p>
  
  <p>Also when I just type Configuration these are the methods that appear: <a href="https://i.stack.imgur.com/NlRLC.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/NlRLC.png" alt="enter image description here"></a></p>
  
  <p>Do I maybe have the wrong Configuration referenced or something?</p>