Category "jestjs"

Trigger useEffect in Jest and Enzyme testing

I'm using Jest and Enzyme to test a React functional component. MyComponent: export const getGroups = async () => { const data = await fetch(groupApi

How to pass a an argument to getByText in react Testing Library?

Currently I'm doing this getByText(/SomeText/i); But I want to make a function and pass some text as an argument by first storing it in a variable. I tried doi

Jest: function that should throw does not pass and test will fail

I want to test a function A that calls multiple other functions inside it which can throw errors. Here is an abstraction of my code: // file A.ts const A = (ar

Jest: function that should throw does not pass and test will fail

I want to test a function A that calls multiple other functions inside it which can throw errors. Here is an abstraction of my code: // file A.ts const A = (ar

How can I mock Webpack's require.context in Jest?

Suppose I have the following module: var modulesReq = require.context('.', false, /\.js$/); modulesReq.keys().forEach(function(module) { modulesReq(module);

How to mock a ES6 singleton class with Jest?

I have a dependency that is a singleton class like so: // dependency.js class Dependency { foo() { ... } } export default new Dependency(); I'm trying to

Stencil unit testing: How to mock initial state and load newSpecPage?

I am new to unit testing and planning to write unit test cases but not E-2-E for the below mentioned scenario and playgrounnd link for scenario is at the bottom

Testing asynchronous useEffect

My functional component uses the useEffect hook to fetch data from an API on mount. I want to be able to test that the fetched data is displayed correctly. Whi

Jest testing react component with react-intersection-observer

I'm trying to test a component that has a child component that includes react-intersection-observer but I always get an error I tried to import the library bu

jest with vue3 typescript TypeError: Cannot read property 'deep' of undefined

I am doing unit test using jest. The things I am working with is vue3 (typescript) with quasar. I am facing the following error: TypeError: Cannot read property

Test invalid function arguments with TypeScript and JestJS

I've beend creating a node application with typescript and I'm using jest to write unit tests. My issue: I can't really write unit tests simulating invalid fun

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