My limited brain sometimes has trouble interpreting diffs of arrays of trees of nodes. I find out outputs from jest like the following to be hard to understand: Error: expect(received).toEqual(expe...

hello I am running typescript with esm and jest and I have a problem with middy: I had this test: import { APIGatewayEvent, Context } from 'aws-lambda'; import { lambda } from '../index.js'; descr...

I'm trying to integrate Jest, (ts-jest) into my typescript project which uses styled-components/macros. But for some reason, Jest is complaining with the following error: ts-jest[versions] (WARN) V...

I'm new to testing React/Typescript apps. I want to unit test my React components, because I'm not satisfied to develop apps without tests at all. The app itself works fine, it's just failing to ru...

I try to create an intial setup for Jest in React + TypeScript. I have completed the initial setup and try to check whether the test runs. When I run the test using the command npm test, I am getti...

I am trying to use jest to start unit testing and I came across this error like this one. > npm run unit > [email protected] unit > NODE_OPTIONS=--experimental-vm-modules jest --con...

The path to my development directory is here. . ├── README.md └── business ├── jest.config.ts ├── nodeLayer │ └── db │ ├── README.md │ ├── dist │ │ └── db │ │ ├── index.js │ │ └── index.js....

I am trying to test a react typescript project using jest but it's giving a confusing error: Here is my package.json: "dependencies": { "@testing-library/jest-dom": "^5.1...

Well, using ts-jest 27.x.x, I could access the utils helper by require('ts-jest/utils'), and as you can see in the below picture, it was present in the ts-jest dependency folder: But in a newer pr...

I'm trying to run some tests with Jest but I keep getting an error. It's something to do with a TypeScript config file, I already searched but didn't find much. I'm using NodeJS, TypeORM with TypeS...

I've been using jest --coverage to calculate coverage for my code. I've added a coverageThreshold in jest.config.js but this only checks whole codebase/folder coverage. I also tried jest -o (--only...

Recently upgrading my app to Angular 11. Jest has been set up as the default testing framework. Running npm test results in the following error: ● Test suite failed to run TypeError: Jest: a tran...

Issue Unable to transpile external package exported in ESM syntax Jest Version 29.5.0 Steps to reproduce Clone my repo at https://github.com/paulwongx/turborepo-jest-issue Install packages yarn wo...

Runing test I get this error TypeError: Cannot read properties of undefined (reading 'ngModule') I dont exactly know what is causing this error, but google said circular dependency issue but I am n...

My react component uses translations from i18next and I'm trying to create tests for it using JEST. However, nothing is getting translated and I have tried mocking the useTranslation function below...

I have "jest": "^29.2.1". My unit tests output errors like this: ts-jest[ts-jest-transformer] (WARN) Define `ts-jest` config under `globals` is deprecated. Please do transform: ...

Summarise the problem I'm hitting the following issue whenever running tests in Jest for an angular project: EBUSY: resource busy or locked, open 'C:\Users\<username>\AppData\Local\Temp\jest\...

I have a typescript project with sequelize, and I have two tests that needs to mock the sequelize.authenticate function with different outputs. Here is what I have: test('Return successful health',...

I am using typescript and the code works fine the problem is when I use jest to write test case if throws me error in one of the json file imports informing it doesn't understand " assert{ typ...

I using jest for running my unit test but I am getting an error. TypeError: Cannot read properties of undefined (reading 'getVideoTracks') Any suggestions on how to test the below line in jest [vi...

After upgrading Angular to v 13 when I try to run my tests in the jest environment I have an error: Cannot set base providers because it has already been called import 'jest-preset-angular/setup-je...

I am currently setting up Jest in angular 9 with jest-preset-angular version 9, the code runs but i am getting the following error: TypeError: Cannot read property 'ngModule' of null not sure how t...

After configuring jest, node.js and typescript the script npx jest throws the error in a console TypeError: Jest: a transform must export something. at C:\projects\project-api\node_modules\@jest\t...

I'm having trouble trying to mock a class and a constructor. I have a App.ts class that I want to test: class App { public server: Express; constructor() { this.server = new Express(); this....

I'm trying to build a mobile application with typescript, react-native, expo and jest. When I'm trying to run tests: FAIL src/components/Button/tests/Button.test.tsx ● Test suite failed to run ...