Jest crashes on require('react')

Question

I'm trying to set up Jest in a new React project.

package.json:

"dependencies" : {
  "react": "^0.13.1",
  "jest-cli": "^0.4.5",
  "babel-jest": "^5.2.0"
}, 
"scripts": {
  "test": "jest"
},
"jest": {
  "scriptPreprocessor": "<rootDir>/static/preprocessor.js",
  "unmockedModulePathPatterns": ["react"],
  "testFileExtensions": [
    "js",
    "jsx"
  ],
  "moduleFileExtensions": [
    "js",
    "json",
    "jsx"
  ],
  "testPathDirs": [
    "<rootDir>/static/app"
  ],
  "testDirectoryName": "test",
  "testPathIgnorePatterns": [
    "/node_modules/",
    "/bower_components/"
  ]
}

Test-test.js:

jest.dontMock('../scripts/components/shared/Test');

describe('Test', () => {
  var Test = require('../scripts/components/shared/Test');
  it('registers test', () => {
    expect("yes").toEqual("yes");
  });
});

Test.jsx:

var React = require('react');

When I run npm test on the above, I get the following:

My-MacBook-Pro:project user$ npm test

> Project@0.0.1 test /Users/user/Projects/project
> jest

Using Jest CLI v0.4.5
Waiting on 1 test...My-MacBook-Pro:project user$

If I change Test.jsx to require('lodash'), I get the following:

My-MacBook-Pro:project user$ npm test

> Project@0.0.1 test /Users/user/Projects/project
> jest

Using Jest CLI v0.4.5
 PASS  static/app/test/Test-test.js (0.517s) 
1 test passed (1 total)
Run time: 0.731s
My-MacBook-Pro:project user$

It seems that adding 'react' module causes Jest to crash (without any logging in terminal). I suspect there's something wrong with my configuration, but I can't seem to find what.

Also, is there a way to get more verbose logging? Right now it crashes with no output... I bet I could investigate better if I had some kind of output.

Answer 1

I was having a similar issue. I think the problem lies in the fact that Jest doesn't support node versions above 0.10.x (source). I recommend using nvm to run your tests in a supported version.

*edited for tense