Jest run async function ONCE before all tests

user_1922253 0
Viewed 48980

I want to use jest for my server unit testing (instead of mocha+chai). Is there a way I can run async function before all tests start (init purposes) only once and not for every test file? And also if there's a way of running something after all tests are done?

jestjs javascript
5 Answers

jest provides options for both global setup and teardown in new versions. You can create files for both setup and teardown exporting an async function and provide that path in jest configurarion like this.

"globalSetup": "setup-file-path",
"globalTeardown": "tear-down-file-path"

You can read about it further here

user_46713960

It's become very easy when you use beforeAll function outside the describe block and then assign async keyword to it.

Note: I am using jest @27.4.3 version here

code sample

import { getValuesFromAWSSecretManager } from '../../src/libs/secret_manager';
import quickbooksConfigFrom from '../../src/config/quickbooks';

const quickbooksConfig = quickbooksConfigFrom;

// calling the async beforeALL function to get values from AWS Secret Manager
beforeAll(async () => {
  const secretData = await getValuesFromAWSSecretManager();
  quickbooksConfig.clientId = secretData.QUICKBOOKS_CLIENT_ID;
  quickbooksConfig.clientSecret = secretData.QUICKBOOKS_CLIENT_SECRET;
});

describe('Quickbooks config file should be defined', () => {
  test('Quickbooks File should be exist', () => {
    expect(quickbooksConfig).toBeDefined();
  });

  test('Quickbooks File should be exist and having values', () => {
    expect(quickbooksConfig).toBeTruthy();
  });
});

hope it helps and solves your doubts,

and you might need to do it in each file to apply.

you can check jest beforeAll documentation from here

user_153503910
Related