UnhandledPromiseRejectionWarning: TypeError: Cannot read property 'stack' of undefined

[just-boris]

🐛 Bug Report

When globalSetup function returns an undefined rejected promise, Jest exits with zero exit code and unhandled rejection warning:

(node:23880) UnhandledPromiseRejectionWarning: TypeError: Cannot read property 'stack' of undefined
    at Object.run (/path/to/project/node_modules/jest/node_modules/jest-cli/build/cli/index.js:169:15)
    at processTicksAndRejections (internal/process/task_queues.js:97:5)

To Reproduce

Create a global setup with the following content

module.exports => Promise.reject()

Expected behavior

Jest handles the rejection and exits with non-zero code.

This also worked as expected in Jest 25, so it seems to be a regression

envinfo

  System:
    OS: macOS 10.15.7
    CPU: (12) x64 Intel(R) Core(TM) i7-9750H CPU @ 2.60GHz
  Binaries:
    Node: 12.20.0 - ~/n/bin/node
    npm: 6.14.8 - ~/n/bin/npm
  npmPackages:
    jest: ^26.6.3 => 26.6.3

[github-actions]

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