The app dir is now resolved, so change tests to reflect that.
The app dir is now resolved, so change tests to reflect that.

If this is an issue with changing this, we can just resolve before we
build, which would be a much more localized change, rather than trying
to fix things across JupyterLab

jupyter/jupyterlab,jupyter/jupyterlab,jupyter/jupyterlab,jupyter/jupyterlab,jupyter/jupyterlab