Jest has detected the following {number} open handles potentially keeping Jest from exiting: in version 27

💥 Regression Report

Last working version

Worked up to version: 26.4.2

Stopped working in version: 27.0.6

To Reproduce

Steps to reproduce the behavior:

clone the repo [e-mail]:qunabu/strapi-unit-test-example.git

upgrade jest in package.json from 26.4.2 to 27.0.6

run yarn install

run yarn test

Expected behavior

26.4.2 -> All tests should pass.

27.0.6 -> Jest has detected the following {number} open handles potentially keeping Jest from exiting: The repo use a jest.setTimeout located in ./tests/helpers/strapi.js

Link to repl or repo (highly encouraged)

Run npx envinfo --preset jest

Paste the results here:

  System:
    OS: Linux 5.12 Fedora 34 (Workstation Edition) 34 (Workstation Edition)
    CPU: (8) x64 AMD Ryzen 5 3500U with Radeon Vega Mobile Gfx
  Binaries:
    Node: 14.17.0 - /usr/bin/node
    Yarn: 1.22.5 - ~/.yarn/bin/yarn
    npm: 6.14.13 - /usr/bin/npm
  npmPackages:
    jest: ^27.0.6 => 27.0.6 

Thank you in advance for your reply.

[MiNickel]

Hi. You can update until 26.6.3, versions >= 27.0.0 cause this error.

I have the same issue. The problem is, that it is not possible to go back to Jest 26.6.3 after upgrading to Angular 13.

[Kazdan1994]

Seems using “jest” version “^27.5.0” or higher solved the problem