Error when running npm test or npm run lint-test

[mainangethe]

I recently completed the Is Leap for Javascript.

• I tried to run my tests with the command javascript npm test .
• I went to the link provided by the CLI.
• Expected: to see the results of my unit tests,
• Actual: I got a Type Error.

cannot assign to read only property 'Symbol(Symbol.toStringTag)' of object

Here's my "exercism debug":

**** Debug Information ****
Exercism CLI Version: 2.3.0
Exercism CLI Latest Release: 2.3.0
OS/Architecture: ubuntu, x64
Build OS/Architecture /
Home Dir: /Users/ngethe
Config file: /Users/ngethe/.exercism.json
API Key: *******
Exercises Directory: /Users/ngethe/exercism/javascript
> exercism-javascript@0.0.0 test /home/ngethe/exercism/javascript/leap
> jest --no-cache ./*

**ERROR MESSAGE**
 FAIL  ./leap.spec.js
  ● Test suite failed to run

    TypeError: Cannot assign to read only property 'Symbol(Symbol.toStringTag)' of object '#<process>'

      at exports.default (node_modules/jest-util/build/create_process_object.js:15:34)

Test Suites: 1 failed, 1 total
Tests:       0 total
Snapshots:   0 total
Time:        0.444s
Ran all test suites matching /.\/README.md|.\/isLeap.js|.\/leap.spec.js|.\/node_modules|.\/package-lock.json|.\/package.json/i.

[mainangethe]

[tejasbubane]

This is an issue with Node v11.11 - facebook/create-react-app#6591 For now there is no fix apart from downgrading node version.

[micalgenus]

The project does not seem to use create-react-app. The following was resolved in jest: jestjs/jest#8050

If you use the version of jest and Babel-jest at v24.2.0-alpha.0 or later, you can resolve it. The latest version of best is v24.3.1. 😄

[tejasbubane]

@micalgenus Yes. This project does not use create-react-app and the issue was in Jest. I just happened to find that issue in create-react-app repo and used that issue link.

Alright so we need to update Jest. I tried doing the same after Jest 24 released recently and ran into all sorts of weird issues due to babel 7 (ref) I will give it a try again today.

[mainangethe]

@micalgenus - I tried installing jest and babel-jest @ v24.2.0-alpha.0

And still getting an error. Now it's saying Cannot find module './leap' from 'leap.spec.js'

[SleeplessByte]

And are you certain there is a leap.js file in that directory? Normally you'll have to create this file and write the code in there.

[SleeplessByte]

Resolved in Node 11.12

[tejasbubane]

@mainangethe Please fetch new version of the exercise and try again. Reopen this issue if you are still seeing the error. Thanks!

[caledrummond90]

npm run build
chromium tests/testsuite.html
npm run lint

[SleeplessByte]

@caledrummond90 I don't know why you posted this in this issue, but there is no build script in exercism/javascript, and no testsuite.html.