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I have been trying to test an else block for when window is undefined. As I'm using Next.js the… Read more How Can I Set Window To Undefined In Order To Test The Ssr Rendering In An Isomorphic Application?

I would like to mock localStorage methods in jest for error simulation. I have localstorage getter … Read more Jest Mock Localstorage Methods

I'm wondering why jest.useFakeTimers is working with setTimeout but not with the delay operator… Read more Why Is Jest.usefaketimers Not Working With Rxjs Observable Delay

I already am implementing unit tests using redux-mock-store. I would like to perform an integration… Read more How Can I Test A Store Singleton?

I'm trying to refactor a unit test to isolate a service that calls an API using axios from the … Read more How Can I Mock A Service Within A React Component To Isolate Unit Tests In Jest?

I'm calling this function in my code and throwing an error: myFunction(message) { if (!mess… Read more Jest Failing With Unhelpful Error Message When Throwing New Error

I have a module, for the purposes of learning testing, that looks like this: api.js import axios fr… Read more What Is The State Of The Art For Testing/mocking Functions Within A Module In 2018?

I'm trying to test the following function from my network.js: export function post (data) { r… Read more Testing An Ajax Function With Xhr-mock Fails