https://devblogs.microsoft.com/commandline/cascadia-code/ says

👉 Note: There is currently no proper testing framework built into the repository, so all pull requests will have to be manually tested and validated. This will slow down pull request approvals, so please bear with us. 😊

The www.GitHub.com/googlefonts/FontBakery font testing tool may be suitable for meeting this need. It has been successfully used via Travis CI to do regression testing.

cc @felipesanches @graphicore @m4rc1e