How to Test a React App End to End

The problem

A React app's test setup usually stops at the component boundary: React Testing Library, a bit of Jest or Vitest, maybe Storybook. All useful, all fast — and none of it tells you that the real sign-up flow is broken, because no component test renders the whole app, hits the real API, and follows the redirect.

The end-to-end layer is where "it works on my machine" and "it works for a user" diverge, and it's the layer most React projects under-test.

Why the usual approach falls short

• Component tests over-mock. Push coverage down far enough and you're testing your mocks, not your app.
• A Playwright or Cypress suite is a second React codebase — selectors, waits, fixtures — that drifts every time you touch the UI.
• SPA specifics add friction. Client-side routing, Suspense boundaries, and data-loading states make scripted E2E tests flakier and more work to keep stable.

How Manta fits

Point Manta at your running React app — a Vite dev deploy, a preview URL, staging — and it explores it like a user: navigating client-side routes, waiting for async renders to settle, filling forms, following redirects. It reports broken flows with screenshots and reproduction steps, and there's nothing to write or maintain when you refactor a component or swap a UI library.

For the flows you can't afford to break, describe them in plain English and Manta checks them every run.

Your unit and component tests stay exactly where they are. The end-to-end testing guide covers how the layers divide up, and the comparison with Playwright covers the managed-vs-DIY choice for the E2E layer specifically.

What your first run looks like

1. Get a URL for the running app and a test account.
2. Point Manta at it and start a run; it discovers routes and flows as it explores.
3. Review the bug list and navigation map; lock in the critical journeys as plain-English checks.

Walkthrough: running your first test.

The outcome

Real end-to-end coverage of your React app — SPA routing, async rendering, and all — with your fast component tests underneath and no E2E suite to babysit.