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jest (JavaScript + Test, also has meaning of ‘joke’)

A Testing Framework Made by Facebook

Supports TypeScript! Fully supports Babel/React/Node.js.

There are alternatives like Vitest (Vite), Jasmine, Mocha+Sinon+Chai.

Jest

Why People Avoid Testing

1. Uncertainty about the benefits of testing
2. It's a hassle
3. It's stressful
4. It takes a long time

Why You Should Test

1. Same bugs reappear
2. Code is complex and requires many changes
3. A change in one part causes errors in other parts
4. You’re responsible for long-term maintenance

Should You Do TDD?

Can frontend even do TDD? → BDD