End-to-End Tests

Playwright drives the real dist/ export, not a dev server, so the suite covers the bundle that actually ships including the SPA fallback and the MangaDex proxy shape.

Run it

bun run e2e:install     # once: downloads chromium
bun run build:web       # required — the suite serves dist/
bun run e2e
bun run e2e -- --headed --project=chromium   # watch it

e2e/serve.ts serves dist/ on port 4173 and reproduces the two netlify.toml behaviours the app depends on: fallback to index.html for any unmatched path, and /_mdx/* proxied to api.mangadex.org. Playwright starts it via webServer and reuses a running one locally.

A stale dist/ silently tests old code. Rebuild before trusting a pass.

Writing a test

Target visible copy the app owns. React Native Web renders deeply nested unlabelled divs whose structure changes whenever a StyleSheet does, so CSS selectors and nth indexes rot immediately.

Prefer	Avoid
getByPlaceholder(/search/i)	locator("input").nth(2)
getByText(/quick lookup/i)	locator("div > div > span")
getByRole("button", { name: "Sign in" })	locator(".css-1a2b3c")

Once the accessibility skill has annotated a surface, switch its tests to getByRole with the accessible name. That makes the e2e suite double as an a11y regression check: a lost accessibilityLabel fails a test.

Pick a stable, fully mapped catalog entry for detail-route tests (/series/5114, Fullmetal Alchemist: Brotherhood). Do not assert on remote AniList or MangaDex copy: titles, descriptions, and cover URLs change upstream and would make the suite flaky.

What belongs here

Layer	Test it with
Pure mapping maths, merge logic	Jest, via domain-tests
A screen renders and responds	Playwright
Deep link and SPA fallback	Playwright, asserting res.status()
Auth and progress sync round-trip	Playwright, against a throwaway account

Do not re-test range arithmetic through the browser. Assert that Quick Lookup produces an answer; assert which answer in a Jest test.

Wiring into CI

system-check deliberately does not run e2e: it is the pre-commit and pre-push hook, and a chromium download plus a web build per commit is too slow. Add e2e as a separate CI job after the build step in .github/workflows/ci.yml, reusing the dist/ the build job already produced.

Common mistakes

Mistake	Consequence
Running bun run e2e without rebuilding	Tests pass against the previous bundle.
Asserting on AniList titles or descriptions	Upstream edits break the suite for reasons unrelated to the app.
Using waitForTimeout	Flaky. Use expect(...).toBeVisible(), which retries.
Adding e2e to system-check	Every commit pays a full web build. Keep it a separate CI job.
Testing arithmetic through the UI	Slow and imprecise. That is what domain-tests is for.