Jest hangs indefinitely using external jsdom

[EnoahNetzach]

Do you want to request a feature or report a bug?

A bug.

What is the current behavior?

Running tests with jsdom.jsdom(undefined, { url: URL }) hangs indefinitely.
If the CLI var --env=jsdom is provided, the number of tests in one single file that can use jsdom grows to ~12 (but this could be machine-dependent), but adding one additional test makes it hang once again.

If the current behavior is a bug, please provide the steps to reproduce and if possible a minimal repository on GitHub that we can npm install and npm test.

git clone https://github.com/EnoahNetzach/jsdom-server-test, then follow the instructions on its README.

A real-life example is facebook/create-react-app#1187.

What is the expected behavior?

It shouldn't hang.

Run Jest again with --debug and provide the full configuration it prints. Please mention your node and npm version and operating system.

• uname -mrs: Linux 4.8.8-200.fc24.x86_64 x86_64
• npm --version: 3.10.8
• node --version: v6.9.1
• jest config:

{
  "collectCoverageFrom": [
    "src/**/*.{js,jsx}"
  ],
  "setupFiles": [
    "/home/netzach/Develop/jest-jsdom/node_modules/react-scripts/config/polyfills.js"
  ],
  "testPathIgnorePatterns": [
    "/home/netzach/Develop/jest-jsdom[/\\\\](build|docs|node_modules)[/\\\\]"
  ],
  "testEnvironment": "/home/netzach/Develop/jest-jsdom/node_modules/jest-environment-node/build/index.js",
  "testURL": "http:https://localhost",
  "transform": [
    [
      "^.+\\.(js|jsx)$",
      "/home/netzach/Develop/jest-jsdom/node_modules/react-scripts/config/jest/babelTransform.js"
    ],
    [
      "^.+\\.css$",
      "/home/netzach/Develop/jest-jsdom/node_modules/react-scripts/config/jest/cssTransform.js"
    ],
    [
      "^(?!.*\\.(js|jsx|css|json)$)",
      "/home/netzach/Develop/jest-jsdom/node_modules/react-scripts/config/jest/fileTransform.js"
    ]
  ],
  "transformIgnorePatterns": [
    "[/\\\\]node_modules[/\\\\].+\\.(js|jsx)$"
  ],
  "moduleNameMapper": [
    [
      "^react-native$",
      "react-native-web"
    ]
  ],
  "rootDir": "/home/netzach/Develop/jest-jsdom",
  "name": "-home-netzach-Develop-jest-jsdom",
  "testRunner": "/home/netzach/Develop/jest-jsdom/node_modules/jest-jasmine2/build/index.js",
  "automock": false,
  "bail": false,
  "browser": false,
  "cacheDirectory": "/tmp/jest",
  "coveragePathIgnorePatterns": [
    "/node_modules/"
  ],
  "coverageReporters": [
    "json",
    "text",
    "lcov",
    "clover"
  ],
  "expand": false,
  "globals": {},
  "haste": {
    "providesModuleNodeModules": []
  },
  "mocksPattern": "__mocks__",
  "moduleDirectories": [
    "node_modules"
  ],
  "moduleFileExtensions": [
    "js",
    "json",
    "jsx",
    "node"
  ],
  "modulePathIgnorePatterns": [],
  "noStackTrace": false,
  "notify": false,
  "preset": null,
  "resetMocks": false,
  "resetModules": false,
  "snapshotSerializers": [],
  "testPathDirs": [
    "/home/netzach/Develop/jest-jsdom"
  ],
  "testRegex": "(/__tests__/.*|\\.(test|spec))\\.jsx?$",
  "timers": "real",
  "useStderr": false,
  "verbose": null,
  "watch": false,
  "cache": true,
  "watchman": true
}

---

I'm not entirely sure this is a jest bug.
It could be a jsdom one, although I can reproduce this only with jest.

[cpojer]

I don't think this is a Jest issue. We don't have any issues with jsdom starting to hang with thousands of tests, so it may be your test code. Is there a reason you cannot use Jest's provided jsdom environment?

[EnoahNetzach]

Is there a way to use jsom's internal calls (jsdom.env() or jsdom.jsdom()) from jest?

[cpojer]

no, we don't expose those. It may be that your test is not cleaning up old instances of jsdom properly if you can only use 12 instances of jsdom.

[EnoahNetzach]

it happens also with onlt one instance when I'm not passing --env=jsdom to jest, and it doesn't happen with mocha (I tried it just for being confident about it not being a jsdom problem, I still prefer jest a lot ❤️)

[cpojer]

Yeah, there might be some issue somewhere but it isn't really something we actively support so we'll have to rely on your pull requests to help us out :)

[EnoahNetzach]

understood, I'll try to find out that somewhere (if any) asap ;)

[Nitive]

@EnoahNetzach, recently has a problem when jest hangs after even jest --version. And everything was fine on CI. It was a problem with watchman which used inside jest.
Maybe this helps.

[EnoahNetzach]

Thanks @Nitive, but for other tests it works just fine, and there is a "hard wired" number of tests it correctly handles (12), so I don't think it's a watchman problem.

[sattaman]

I've got a similar issue

[bugzpodder]

Jest has detected the following 1 open handle potentially keeping Jest from exiting:

● PROMISE

      at Function.resolve (<anonymous>)
  at Object.<anonymous> (node_modules/lodash.sortby/index.js:1808:32)
  at Object.<anonymous> (node_modules/whatwg-url/lib/URLSearchParams-impl.js:2:22)

https://github.com/lodash/lodash/blob/d10b44bdef2b735865c493fbaec8687ec8998aef/.internal/getTag.js#L30

[github-actions]

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