Vitest
Fast unit testing for modern JavaScript projects.
Vite-native, Jest-compatible, and fast enough to run continuously in watch mode. Speed is the point: a test suite that finishes in two seconds gets run on every change, and one that takes four minutes doesn't.
Best for
Quick unit tests the agent can run after every change.
Watch out for
Tests written by the same AI that wrote the bug can encode the bug. Read them.
Using this and stuck anyway?
Knowing the tool isn't the same as finishing the project. If yours has stopped moving, we'll take a look at it.
Tell us what's broken