Intermediate

Testing React Apps

Test components the way users interact with them using Vitest and React Testing Library — not implementation details. Set up Vitest with jsdom, test components with user interaction, mock network requests with MSW, and test a component that uses TanStack Query.

~6h

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Intro

Testing Library's philosophy: test behavior, not internals

React Testing Library deliberately makes it awkward to reach into a component's internal state or check exactly which CSS class got applied — queries are built around what a user can actually see and do (getByRole, getByLabelText), which means tests survive refactors that don't change behavior. This project sets up Vitest with jsdom, tests components with user interaction, mocks network requests with MSW, and tests a component that uses TanStack Query.

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Step 1 — Set up Vitest with jsdom and Testing Library

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Step 2 — Test interactions with user-event, not fireEvent

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Step 3 — Mock network requests with MSW

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Step 4 — Test a component that uses TanStack Query

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Secret Mission

Secret Mission: hit 80% coverage on one feature

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Wrap Up

Before You Go

Pro

Test what you just learned

Self-testing is one of the best ways to retain new skills. Unlock project quizzes to check your understanding.

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