In this recipe, we created a standalone test application and we opened it in Visual Studio Code as a standalone project. You can also create a multi-root workspace that contains both the test application and the application that it's testing. This makes it much easier to jump between the two projects during the development and testing phases.
You can read more about multi-root workspaces here: https://code.visualstudio.com/docs/editor/multi-root-workspaces.