topic · JavaScript

Testing — vitest / jest / playwright, Test Doubles, Fake Timers

JavaScript skills for the React Developer (Frontend) career path. Filter, model, and reason about the real data this role works with every day.

Professional Mid priority 1 Sandbox & Project Sandbox & Interactive Quiz

What you'll learn

JavaScript skills for the React Developer (Frontend)

this lesson focuses on the practical JavaScript toolkit a working React Developer (Frontend) reaches for on the job.

javascriptvitestjestplaywrightmockfaketimers

Sandbox preview

Try the first query

-- JavaScript — your first interaction
SELECT example, value
FROM javascript_dataset
WHERE priority = '1'
AND career = 'React Developer (Frontend)';

▸ preview · Sprint-2 will replace this with a live runner

Next up in this path

ESLint / Prettier — Flat Config, TypeScript Plugins, Pre-commit Hooks

Once this topic clicks, the recommended next step keeps the learning streak going on adjacent skills in the same career path.

continue path →

Build status

Sprint-1 stub

This is the Sprint-1 stub for ai.careerplane.technology.react-developer.javascript.testing-vitest. The fully-generated topic page (sandbox + quiz + AI hints + interactive tooling) lands in Sprint-2 at static/content/technology/React Developer (Frontend)/JavaScript/Testing — vitest / jest / playwright, Test Doubles, Fake Timers/index.html (per arch/memo.md → D-2026-04-22-13). The //go:embed all:static directive auto-serves it on the next container rebuild — no server-code change needed.

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