Enzyme: Error: Cannot find module 'react-dom/lib/ReactTestUtils'

[tomoueda]

I'm getting this error during a test run:

Error: Cannot find module 'react-dom/lib/ReactTestUtils',

I'm also getting this message:

react-addons-test-utils is an implicit dependency in order to support [email protected]. Please add the appropriate version to your devDependencies. See https://github.com/airbnb/enzyme#installation

I installed the required dependencies, I'm still getting the same error.

This only started happening today randomly.

[ljharb]

React 15.4 broke some things.

If you downgrade to 15.3, things should continue to work.

I'll look into fixing the underlying issue.

[tomoueda]

Were on version 14.8, the new react version shouldn't have affected our project.

[ljharb]

If you run npm ls, are there no copies of React 15 in your dep tree?

[ljharb]

Hmm - I can't reproduce this locally with our tests.

Can you provide your package.json (the deps and dev deps) as well as npm ls output?

[tomoueda]

I'm not at a liberty to provide, but does node version matter? We're running node0.10, and npm3

[aweary]

@tomoueda can you share the stack trace for the react-dom/lib/ReactTestUtils error?

[aweary]

It seems most likely that you are somehow depending on the latest version of React, or at least of react-addons-test-utils. Your issue coincides with the release timing, and we've seen similar reports with the same error message (https://github.com/facebook/react/issues/8314) reported on the React repo.

[tomoueda]

Hmm yeah thats probably it, I'll try to find out where I refer to the latest version. Thanks.

[ljharb]

@tomoueda also node 0.10 is officially EOL'd, you really need to get on 4 or 6 ASAP.

[tomoueda]

Thanks,

I figured out my issue:

I had this dependency in my package:

"react-addons-test-utils": "^15.2.0"

this auto upgraded to 15.4, reducing the version of react-addons-test-utils, fixed my problem.

Thanks, everyone.

[DDKnoll]

Also had this issue when I had "react-addons-test-utils": "0.14.0" installed. There was a dependency conflict with the jsx-chai package. Updating to "react-addons-test-utils": "0.14.8" resolved the dependency conflict.

[danehrlich1]

I was on "react-addons-test-utils": "^15.3.2" and I moved to "0.14.8" per a couple of people's suggestion here and it fixed the issue immediately with Travis-CI.

[ezmiller]

I was having this problem and downgraded to 15.3.0, which solved the problem for now.

[gastonkirsman]

Downgraded react-addons-test-utils to ^0.14.8 and fixed the problem!

[Vanuan]

So what's the solution if I'm on 15.4?

[ljharb]

It's not about any particular version, it's that all of the core react-* packages in npm ls must be the same version.

[jackson-sandland]

One of my core-react dependencies was set to a different version in the package.json. When I ran npm test - the shell complained that react was not installed. After making sure the core react-* packages were in sync - problem solved. Thanks!

[eldyvoon]

@ljharb what does that means? How to solve this problem? I tried to downgrade react-addons-test-utils still couldn't get my problem solved.

[ljharb]

@eldyvoon what's your package.json look like?

[balinskia]

I think it is fixed in: [email protected]

[robin22d]

Im getting this error. Here is my package.json:

{
  "name": "list",
  "version": "0.1.0",
  "private": true,
  "dependencies": {
    "react": "^16.0.0",
    "react-dom": "^16.0.0",
    "react-scripts": "1.0.14"
  },
  "scripts": {
    "start": "react-scripts start",
    "build": "react-scripts build",
    "test": "tape -r babel-register ./__test__/*.js | tap-spec",
    "eject": "react-scripts eject"
  },
  "devDependencies": {
    "babel-preset-es2016": "^6.24.1",
    "babel-preset-react": "^6.24.1",
    "babel-register": "^6.26.0",
    "extend-tape": "^1.2.0",
    "react-addons-test-utils": "^15.6.2",
    "tap-spec": "^4.1.1",
    "tape": "^4.8.0",
    "tape-jsx-equals": "^1.0.0"
  },
  "babel": {
    "presets": ["react", "es2015"]
  }
}

[ljharb]

@robin22d you have react 16, but react-addons-test-utils 15. Remove the react-addons-test-utils line entirely.

[robin22d]

Thank you it works now. Is it build into react 16 now?

[ljharb]

@robin22d It's built into the react 16 enzyme adapter (altho neither your package.json nor react-scripts includes enzyme, so i'm not sure how this repo is relevant to you)

[kerrermanisNL]

For anyone who ran into this thread but is not actually using enzyme. If you find you can't access react-addons-test-utils and you've upgraded from below react (I'm thinking) 15.4 make sure you're importing the TestUtils class from react-dom/test-utils.

react-addons-test-utils no longer exists and has been moved to react-dom. Took me a while to figure out.

[ljharb]

The goal with enzyme, however, is not to need the test utils directly at all :-)

[kerrermanisNL]

@ljharb definitely good to know! For me however I rolled into a (big) project that already uses it and needed to be upgraded to react 16. Searching for a solution to the missing testutils, this came up as the first answer on Google. So I though I'd provide some more information for people following that same route. In any case, thanks for the heads-up!

[zhoulujun]

https://www.zhoulujun.cn/html/tools/webpack/2016_0217_6459.html
"react": "^16.7.0",
"react-addons-test-utils": "^15.6.2",
"react-dom": "^16.7.0",
react-dom 16 根本就没有lib/ReactTestUtils 这玩意儿。
于是修改，react-addons-test-utils index 文件,坑还是未填好
//module.exports = require('react-dom/lib/ReactTestUtils');
module.exports = require('react-dom/test-utils');
最好还是降级到15.x ，期待官方修复！