Learn how to configure Playwright to use Jest as its test runner and use TypeScript for writing tests. Also covers how to debug tests in VS Code. Playwright is a newish end-to-end cross-browser testing tool from Microsoft. I usually use Cypress for these kinds of tests on SPAs, but Playwright is quickly gaining traction, so I thought it was time to give it a try.
A Beginners Guide to Learn Mock Fetching in Jest. I am writing this post to show how to mock and test fetch with jest-fetch-mock. let's suppose that you are using Jest and you are comfortable with “async/await”.
Learn how to integrate Jest and Puppeteer in your project for End-to-End Testing.
This article explains how to mock TypeScript method overloads with Jest. Mocking overloaded TS methods with Jest is not hard per se, but you have to know how to do it. Method overloading is a very familiar concept for any developer used to Object-Oriented Programming.
5 Tips to Perfect React Testing Library Queries: Using screen debug, query by text, query by label text, query by role and within. My strategy to retrieve any element with the Testing Library API. Testing Library provides lots of tools to help query the right element to test.
Imagine if there was a way to simplify this process, so that as a developer, you could just sit back and watch those green checkmarks appear automatically. With Chromogen, you can!
Testing Library's UserEvent Library builds on top of Testing Library's FireEvent API to better simulate browser interactions and makes it even ...
Before I move on, if you prefer to jump right to code examples I have created an Example Repository with instructions in the readme for trying it out. The rest of this article will be my longform explanation about my debugging techniques, git bisect, and an example of when it is useful. I’ve also got something really cool at the end of the article.
The key aspect of effective unit testing is define boundaries of the business logic to be tested.
As I have done a couple of backend testing blogs with RSpec and Ruby on Rails. I have decided to do a couple on frontend testing with Jest. To begin with, I was looking at frontend testing and wasn’t sure whether to start learning Jest or Mocha. I found a great blog explaining them both and would highly recommend reading it as it briefly discusses both of them. Starting Out with Jest
In this article, we will be looking at the basic principles of unit tests with a simple react-native Button component.
Learn how to test Web Workers with Jest. Webpack-bundled Web Workers are not supported by Jest so we have to mock the worker in order to test it!
I decided to spend today learning the ins and out of using Jest and creating test cases so that I may add unit tests to my projects.
In this article, we are going to discuss how we can write integration tests using Jest, Supertest and in process of writing integration tests, we often require mocking npm modules and dependencies, so we will also mock these npm modules and dependencies for smooth and complete testing.
Learn how to modernize Angular with the latest linting and testing tools, upgraded CLI, computation caching, and more with nx.dev.