22,931 questions
-1
votes
1
answer
60
views
TypeError: Cannot read properties of null (reading 'getConfig') [closed]
how can i resolve this problem and this my jest.config.js
module.exports = {
preset: 'react-native',
"setupFilesAfterEnv": [
"@testing-library/jest-native/extend-expect"
]...
Tooling
0
votes
2
replies
50
views
How to write tests which analyze HTTP requests made on NextJS server side?
I work on a NextJS project with Pages Router. We are using Jest for unit tests and Playwright for E2E.
The application we are making is a funnel with several steps. Each step is a form with several ...
- 623
1
vote
1
answer
55
views
Jest + Testcontainers MongoDB: Intermittent ECONNREFUSED errors running integration tests
Problem
Starting November 10th, my Jest integration tests began failing randomly with MongoDB connection errors. The tests use @testcontainers/mongodb v11.5.1 and mongodb v8.0.12.
Error:
...
- 61
0
votes
1
answer
54
views
When upgrading to React 19 and NextJS 15, jest snapshots that had header changes via `next/head` break
In our tests, we had several snapshots that included content wrapped in next/head. We had previously followed the below pattern for the mock, which allowed us to see all the header tags like meta, ...
- 3,157
-1
votes
0
answers
57
views
Argument of type 'PoolConnection' is not assignable to parameter of type 'never'
I want to mock transaction as PoolConnection
jest.mock('../../src/config/db.js', () => ({
__esModule: true,
default: {
execute: jest.fn(),
query: jest.fn(),
...
1
vote
0
answers
88
views
Problem with toHaveBeenCalledWith called from window object
This is my unit test:
import '@testing-library/jest-dom/extend-expect';
import {
render,
cleanup,
fireEvent,
waitFor,
waitForElementToBeRemoved,
screen,
} from '@testing-library/svelte';
...
- 595
1
vote
1
answer
84
views
Zustand persist doesn't execute in testing
I am doing unit testing for my project.
This is the code I want to test:
import { create } from "zustand";
import { persist } from "zustand/middleware";
interface LanguageState {
...
0
votes
1
answer
39
views
Why is jest `globalSetup` not run for certain project-related invocations? [closed]
I have a TypeScript monorepo that uses jest, and has a globalSetup script configured at the root config (it starts a local database process that many of the tests use).
Example
Directory structure
...
- 592
0
votes
1
answer
73
views
Element type is invalid on render method of "App" using Jest
I am attempting to run a simple Jest test to render the App element. This is our App.test.tsx:
test('render application', () => {
render(<App />);
}
This is the error that is being ...
- 7
0
votes
0
answers
40
views
Jest/Puppeteer test for a Chrome Extension fails with timeout on Firestore getDoc, but manual tests and Cloud Function succeed
I am building a Manifest V3 Chrome Extension using Firebase and testing it with Jest and Puppeteer. My manual testing works perfectly, but one specific automated test consistently fails with a 30-...
0
votes
0
answers
38
views
jest object in setupFilesAfterEnv differs from jest in test files
I’m trying to add a custom method onto the Jest API inside a setup file (config.ts) configured via setupFilesAfterEnv. However, the jest object I mutate in the setup file is NOT the same reference as ...
- 2,412
0
votes
0
answers
481
views
Mock jsdom Location using @jest/environment-jsdom-abstract
Jest 30 uses JSDOM 26, which breaks my tests. I want to test if location.search was modified.
Since JSDOM 21, it is not possible to mock location.search as easily as it used to be:
// does not work ...
- 1,892
0
votes
0
answers
87
views
Jest hangs when publishing to @google-cloud/pubsub in integration test
I have an integration test that publishes a domain event to Google Cloud Pub/Sub (using the Pub/Sub emulator). Eventduspatcher.integration.test.ts passes but Jest prints:
Jest did not exit one second ...
- 1
0
votes
0
answers
233
views
Failed to parse the TypeScript config file with Jest 30.x and Node 22.18+
I'm running into some inconsistent behavior with Jest 30.x, specifically when parsing a jest.config.ts file that imports another TypeScript module, on Node.js 22.18+. My code uses ESM syntax for the ...
1
vote
0
answers
46
views
Is Jest cache shared with other projects on a CI server?
My question is related to Enabling Jest cache in CI servers but a bit more specific.
We use Jest with cache enabled on a CI server running tests on multiple projects.
By default, Jest uses /tmp/...
