Jest

Testing · a JavaScript test framework

created October 25, 2026 · updated October 25, 2026

One of the most widespread automated test frameworks for JavaScript code. You describe what a function must return for a given input, and Jest runs all such checks and shows which ones failed. From the same family as Vitest and QUnit, and it checks finished code, not the rules of a system as Quint does.

Source: jestjs.io, the Jest site

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