Question

47

How to use a Global Variable in Jest

rated 0 times [ 50] [ 3] / answers: 1 / hits: 11451 / 5 Years ago, fri, december 20, 2019, 12:00:00

I've got my Yarn package.json set up like this, where I create a global variable called localPath.

{

  jest: {

    globals: {

      localPath: Users/alex/Git/mytodolist

    }

  }

}

Then, in one of my spec tests, I run

console.log(localPath)

but get this error.

ReferenceError: localPath is not defined



      5 | 

    > 6 |   console.log(localPath)

Does anyone know how to call the global variable you set up? I can only find articles on creating the variable, but not on how to call it.

Source: https://jestjs.io/docs/en/configuration#globals-object

Edit: Thanks to @slideshowp2 for the correct answer below. Turns out I didn't need to use a global variable in the end, as you can dynamically grab the execution path at run time. However, this will certainly be useful in the future.

beforeAll(async () => {

  await page.goto('file:///'+process.cwd()+'/index.html')

})

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raveno

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answered 5 Years ago tayla · Accepted Answer

It should work. Here is a minimal working example:

./src/index.js:

export function sum(a, b) {

  return a + b;

}

./src/__tests__/index.spec.js:

import { sum } from ../;



it(should sum, () => {

  // eslint-disable-next-line

  console.log(localPath: , localPath);

  const actualValue = sum(1, 2);

  expect(actualValue).toBe(3);

});

jest.config.js:

module.exports = {

  preset: ts-jest/presets/js-with-ts,

  testEnvironment: node,

  coverageReporters: [json, text, lcov, clover],

  testMatch: [**/__tests__/**/*.[jt]s?(x), **/?(*.)+(spec|test).[jt]s?(x)],

  globals: {

    localPath: Users/alex/Git/mytodolist

  }

};

Unit test result:

 PASS  src/__tests__/index.spec.js

  ✓ should sum (4ms)



  console.log src/__tests__/index.spec.js:5

    localPath:  Users/alex/Git/mytodolist



Test Suites: 1 passed, 1 total

Tests:       1 passed, 1 total

Snapshots:   0 total

Time:        2.233s

Ran all test suites.

As you can see, the value of global variable localPath has been set. Please print the global object and check in your tests.

Codesandbox: https://codesandbox.io/s/unruffled-feistel-byfcc