Puppeteer is another framework that is still easy to write tests with but is also much faster at runtime. Cypress makes writing end to end tests very easy, but they are still slow to run. Frameworks like Cypress have tackled the first problem, coming with its own ide, having the ability to record tests, and being able to edit the tests live in a browser. Making writing and running E2E tests both fast and reliable. Well, new tools and libraries have tackled these problems. So why don't we write enough E2E tests? E2E tests are often seen as painful to write, slow and flaky to run, and we have manual QA anyway right.

Secondly, E2E tests act as documentation of all the user flows the application should handle and what features it provides. This means after you write new features, refactor existing code, or are about to release you can be confident that everything still works. Firstly it helps ensure that features work from a users perspective by running the tests. What is End to End testing?Įnd to end testing simulates user flows, essentially testing how a real user would use the application. That's why writing more End to End tests is important. However, the dev community still has a long way to go with testing user flows and making sure features actually work.

Snapshot testing is becoming more and more common to check that the UI doesn't change unexpectedly.

Unit testing is now a standard in software development, sometimes we even write them before the code. To download files with Puppteer we can either the browser's fetch feature - which will download the file into a javascript variable - or find and click the download button which will download the file to the browser's save directory: // start puppeteerĬonst browser = await puppeteer.launch() Īwait page._nd('Page.We all know writing tests is important.

Download jest puppeteer