Mastering React Component Re-rendering in Jest
In this hands-on guide, we’ll explore the art of optimizing React component re-rendering within Jest tests. By combining theory with practical coding examples, you’ll gain a deep…
How To Re-render React Components in Jest
Re-rendering a component is an important part of testing, especially when you are testing stateful components. Jest, React Testing Library and Enzyme provide methods to re-render components…
Test responsive design using jest and react-testing-library
Testing design breakpoints in React applications is an important aspect of front-end development. It ensures that the components look and behave as expected on different screen sizes….
Testing React-Query with Jest and React-testing-library
Introduction In this article we will cover the basic usage of testing useQuery hook from tanstack/react-query library, along with how to test it using jest and react-testing-library….
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…
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…
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…