FrontendQA/TestingTable-stakesAround since 2021
Vitest
Also written as Jest
The standard test runners for JavaScript and TypeScript — Jest is the long-established one, Vitest the faster modern equivalent built for Vite projects.
Think of it like
The rig that runs every check automatically, rather than someone clicking through the app.
Junior or senior?
Table-stakes for frontend roles. Depth shows in what they test and how they handle mocking, not in the runner they name.
Ask them
“What do you make a point of testing in frontend code, and what do you deliberately not test?”