cd fastboot-test
yarn
ember b
node server.js

Navigates to http://0.0.0.0:4000/google

This works because we are require'ing from a level up https://github.com/ember-fastboot/fastboot/blob/v1.2.0/src/ember-app.js#L130

cd server
yarn
node server.js

You will see something like

Error: Cannot find module 'abortcontroller-polyfill/dist/cjs-ponyfill'

If you put a console.log at fbtest/server/node_modules/fastboot/src/ember-app.js

The path is ... fbtest/fastboot-test/dist/node_modules/abortcontroller-polyfill/dist/cjs-ponyfill