Fixture builders match the hand-written API types with deterministic
ids. Handlers are per-domain factories tests compose via worker.use;
unstubbed requests fail loudly. sseController streams real
text/event-stream bodies through MSW into EventSource, so generation
and download progress are testable without touching the transport.
renderRoute mounts the real route tree over memory history. Query
clients drain on teardown so in-flight fetches can't leak past handler
reset, and the browser project pre-bundles app deps so a cold dep-
optimizer cache can't reload mid-run.
Two projects in one root config: 'unit' (happy-dom) for stores, hooks,
and utils, and 'browser' (real Chromium via the playwright provider)
for component tests — no jsdom polyfills for EventSource, AudioContext,
or canvas. Harness pieces: createMockPlatform (spy-able Platform with
an updater emit handle), renderWithProviders (fresh QueryClient with
polling disabled + PlatformProvider), MSW worker with baseline health
handler, and a store-reset teardown covering all eight zustand stores.
Seed tests cover uiStore theme, serverStore invalidation, and an
AboutPage render in Chromium.
Requires node >= 20 (.node-version added); run with bun run test.
Jamie Pine