React Testing Library - https://testing-library.com/docs/react-testing-library/intro/. - Source: dev.to / about 2 months ago

React Testing Library: provides utilities to make testing easier. - Source: dev.to / 3 months ago

Since we are testing the front-end, we will also rely on the React Testing Library, which provides support for rendering components and custom queries in the DOM. - Source: dev.to / 3 months ago

It’s not to say 100% coverage is the way to go, but at least some functional testing with something like react-testing-library and cypress can save a lot of time. - Source: dev.to / 6 months ago

If you happen to be using React Testing Library in your project, you'll need to keep the jsdom dev dependency installed. - Source: dev.to / 7 months ago

Just download some device frames (https://design.facebook.com/toolsandresources/devices/) and mock it up. Should take less than a minute. Source: about 1 year ago

Why not use something like this: https://design.facebook.com/toolsandresources/devices/ - use the device frame and just place your screen into it, then you can export it at 2/3/4x or whatever you need? Source: over 2 years ago

Meta, the Facebook Design team, publishes a selection of mockups that I generally use for things like this. Source: over 2 years ago

Here you can find some objects that can help you. 😄. Source: almost 3 years ago

Facebook provide device frames you can add the normal screenshot to https://design.facebook.com/toolsandresources/devices. Source: over 3 years ago