Flem is a local emulator that makes testing applications written for the App Engine flexible environment easier. It manages generating docker files, building your containers, and running them in a way that's kinda mostly like running them in production.
Flem is super ultra expiremental, and under active development.
This is a not an official Google project.
Flem requires Docker to be installed and available on the path. After that ...
$ npm install -g flem
Flem is a command line tool, and a library. You can cd into any App Engine Flexible application with an app.yaml, and just run:
$ flem
That's it! You can also customize the port you run on:
$ flem -p 3001
Or run it against a different path:
$ flem -p 3001 ~/Code/myapp
Feel free to submit an issue on the repository, or find me at @JustinBeckwith