QLT.06.02 JuniorCore — asked often

Unit and component tests with Vitest and Testing Library

Comes up in: Coding, React

This concept is being written. It gets the full five steps — explanation, predict, interview angle, practice with tests, and review cards. Here is exactly what it will cover, so you can study it elsewhere in the meantime.

What it covers

Vitest basics
mocking (modules, timers, fetch with MSW)
Testing Library queries priority (getByRole first)
user-event
async utilities (findBy)
testing hooks

Words you will know

mockfake timersquery priority

What you will practise

test a form component fully

Interview questions this answers

Why does Testing Library prefer getByRole?
How do you test code that uses timers or fetch?