Jest.mock is not allowed to reference variables
Sometimes when trying to mock a function in Jest, you might encounter the following error: Service mocked with Jest causes “The module factory of jest.mock() is not…
Clear all the timeout objects from webpage in Javascript
setTimeout function is used to achieve asynchronous tasks in JavaScript. The return value of setTimeout is an Integer. This value can be passed to clearTimeout method to clear that timeout….
Submit formik form using React-Query mutations
In this article you will learn how to create forms using Formik library, and how to submit the forms using React-Query mutation hook. We will cover the…
How to mock and test Intl.DateTimeFormat in Jest
Intl.DateTimeFormat provides powerful functionalities to format dates. This article demonstrates how to mock and test Intl.DateTimeFormat with Jest. Example Consider we have the following function that does…
How to parse a URL query parameters in javascript
To parse the URL query parameters in Javascript, we can use the URLSearchParams interface, which has some utility functions that allow us to easily parse/build URLs. Examples…
Jest useNavigate may be used only in the context of a router
While working with Jest and React-Testing-Library, you might encounter the following error: useNavigate() may be used only in the context of a <Router> component There are two…
useNavigate may be used only in the context of a component
If you’ve ever faced the following error in React: useNavigate() may be used only in the context of a component This error throws in useNavigate hook. This happens…
How to mock React-Router-Dom hooks in Jest
To mock React-Router-Dom hooks in React you need to do the following: Mock the library React-Router-Dom using jest.mock Import non-mocked React-Router-Dom, so that we can use the…
How To Dynamically load a JavaScript file in React
Introduction Some use cases require loading a specific Javascript script conditionally, this article will demonstrate how to dynamically load a javascript file in React once a particular…