Rails integration and unit testing workflow question

I'm making my first integration testing with capybara, thus I'm following a tutorial that creates the MVC with scaffolds first. Is that right? Also, I'm planning to do unit testing as well with TDD, yes I'm aware that TDD needs the tests to be first my question is: "is it possible to generate the tests with scaffold then deleting the scaffolds and creating the controllers, views, migrations with the specific generators?"