Top "Jestjs" questions

Jest is a JavaScript unit testing framework made by Facebook based on Jasmine and provides automated mock creation and a jsdom environment.

How do I test a single file using Jest?

I am able to test multiple files using Jest, but I cannot figure out how to test a single file. …

node.js jestjs
How do I run a single test using Jest?

I have a test 'works with nested children' within the file fix-order-test.js. Running the below runs all the tests …

jestjs
How can I mock an ES6 module import using Jest?

I want to test that one of my ES6 modules calls another ES6 module in a particular way. With Jasmine …

javascript node.js mocking ecmascript-6 jestjs
Message "Async callback was not invoked within the 5000 ms timeout specified by jest.setTimeout"

I'm using Puppeteer and Jest to run some front end tests. My tests look as follows: describe("Profile Tab Exists …

javascript automated-tests jestjs puppeteer
Code coverage for Jest

Is there a way to have code coverage in the Javascript Jest testing framework that is built on top of …

javascript jestjs
How to test the type of a thrown exception in Jest

I'm working with some code where I need to test the type of an exception thrown by a function (is …

javascript unit-testing jestjs
Simulate a button click in Jest

Simulating a button click seems like a very easy/standard operation. Yet, I can't get it to work in Jest.…

javascript reactjs testing jestjs enzyme
How to mock the JavaScript window object using Jest?

I need to test a function which opens a new tab in the browser openStatementsReport(contactIds) { window.open(`a_url_${…

javascript mocking jestjs
How to use ESLint with Jest

I'm attempting to use the ESLint linter with the Jest testing framework. Jest tests run with some globals like jest, …

javascript jestjs eslint
How do I test axios in jest

I have this action in react export function fetchPosts() { const request = axios.get(`${WORDPRESS_URL}`); return { type: FETCH_POSTS, payload: …

javascript reactjs react-redux jestjs