Test fails

🐛 Bug Report

All of my tests fails all of a sudden.

The error is quite vague and low-level. I am not sure exactly what should I do and what it means…

I have tried: - installed jest globally - uninstalling jest globally and running it locally (jest 24.8.0) - changed my node version lower and upper (currently using 10, tried 8, and it was working previously with 10)

describe('Test', () => {

    test('That simple', () => {
        expect(true).toEqual(true);
    });
});

I have a file that sets up the environment for my tests like this:

/**
 * Defines the React 16 Adapter for Enzyme. 
 *
 * @link http://airbnb.io/enzyme/docs/installation/#working-with-react-16
 * @copyright 2017 Airbnb, Inc.
 */
// const enzyme = require("enzyme");
// const Adapter = require("enzyme-adapter-react-16");

// enzyme.configure({ adapter: new Adapter() });

// setup file
import { configure } from 'enzyme';
import Adapter from 'enzyme-adapter-react-16';

configure({ adapter: new Adapter() });

Below is the error that I get…

  ● Test suite failed to run

    SyntaxError: Unexpected token m in JSON at position 0
        at JSON.parse (<anonymous>)

      3 |  *
      4 |  * @link http://airbnb.io/enzyme/docs/installation/#working-with-react-16
    > 5 |  * @copyright 2017 Airbnb, Inc.
        |               ^
      6 |  */
      7 | // const enzyme = require("enzyme");
      8 | // const Adapter = require("enzyme-adapter-react-16");

      at Runtime._loadModule (node_modules/jest-runtime/build/index.js:568:59)
      at Object.<anonymous> (node_modules/entities/lib/decode_codepoint.js:1:106)
      at Object.<anonymous> (node_modules/htmlparser2/lib/Tokenizer.js:3:23)
      at Object.<anonymous> (node_modules/htmlparser2/lib/Parser.js:1:106)
      at Object.<anonymous> (node_modules/htmlparser2/lib/index.js:1:103)
      at Object.<anonymous> (node_modules/cheerio/lib/parse.js:4:18)
      at Object.<anonymous> (node_modules/cheerio/lib/cheerio.js:5:13)
      at Object.<anonymous> (node_modules/cheerio/index.js:5:28)
      at Object.<anonymous> (node_modules/enzyme/build/ReactWrapper.js:15:16)
      at Object.<anonymous> (node_modules/enzyme/build/index.js:3:21)
      at Object.<anonymous> (src/test-setup.js:5:15)

To Reproduce

I am not sure? but my environment is:

npx: installed 1 in 1.505s

  System:
    OS: macOS High Sierra 10.13.6
    CPU: (8) x64 Intel(R) Core(TM) i7-7700HQ CPU @ 2.80GHz
  Binaries:
    Node: 8.11.3 - ~/.nvm/versions/node/v8.11.3/bin/node
    Yarn: 1.12.1 - /usr/local/bin/yarn
    npm: 5.10.0 - ~/Documents/workspace/ISR/mylotto-web-mobile/node_modules/.bin/npm
  npmPackages:
    jest: 24.7.1 => 24.7.1

Expected behavior

Test to run normally and pass…

[nunisa]

I faced the same issue but after hours of googling around in vain, the following change fixed it.

"transformIgnorePatterns": [
  "node_modules/(?!(babel-jest)/)"
]

So, it seems babel-jest was ignored all the time. But, I’m still surprised that this was never required because everything was working and tests were passing with "jest": "^24.7.1" and "babel-jest": "^24.7.1". Find my full configurations here.

Hope this helps!

[sag1v]

@nunisa This is exactly why i’m here, we also upgraded jest and all of a sudden we need to use transformIgnorePatterns