Fastify Hangs with Jest Sample repo

Sample repo demostrating a problem with fastify and using jest.useFakeTimers causing a hang.

To replicate:

• npm install
• npm run test

=> test hangs and fails with timeout.

Comment out

// test/routes/root.test.js

    // jest
    //   .useFakeTimers("modern")
    //   .setSystemTime(new Date("2020-02-08T20:10:21.520Z"));

to make it work.

See jestjs/jest#12056