Foundations for widening Vitest coverage past the pure-helper subset.
The real `@nitrots/nitro-renderer` eagerly loads Pixi v8 and the full
Habbo message parser/composer registry at module-import time, which
jsdom cannot host: any `tests/**` file that transitively pulled a
renderer symbol would throw before a single assertion ran. That's
why the existing 8 suites all stuck to pure modules imported by
concrete path and used `import type` for renderer-side names.
Add a stub at `tests/mocks/renderer-mock.ts`, aliased over the package
via `vitest.config.mts`. It exports:
- Explicit behavioral stubs for the symbols tests actually exercise:
`NitroLogger`, `GetEventDispatcher`, the `mockEventDispatcher`
helper with `addEventListener` / `removeEventListener` /
`dispatchEvent` / `hasListeners`, and `RoomSessionDoorbellEvent`
(signature matches the real `(type, session, userName)` to keep
tsgo happy).
- String-keyed Proxy enums for `NitroEventType`, `RoomObjectCategory`,
`AvatarFigurePartType`, etc. — each access returns a stable unique
string so dispatch and listener agree.
- Lightweight `class StubClass {}` placeholders for the ~30 Pixi and
gameplay classes the `src/api/*` barrel touches at import time
(`NitroAlphaFilter`, `NitroContainer`, `EventDispatcher`, …).
Keeps the cascade from throwing without simulating behavior tests
don't care about.
- Singleton getters (`GetAssetManager`, `GetCommunication`,
`GetSessionDataManager`, …) returning a chainable Proxy so deeply
nested `GetX().y.z(…)` access evaluates to no-op proxies.
Pilots on top of that layer (each one designed to catch a different
class of regression):
- `tests/WidgetErrorBoundary.test.tsx` (4 cases) — happy path,
default silent fallback + `NitroLogger.error` call, custom
fallback node, default `unknown` widget name.
- `tests/useDoorbellState.test.tsx` (7 cases) — initial empty state,
append on `RSDE_DOORBELL`, dedup duplicate names, remove on
`RSDE_ACCEPTED` / `RSDE_REJECTED`, ignore stale events for
never-pending users, full unsubscribe on unmount.
Suite count now 124/124 across 10 files (was 113/113 across 8).
`yarn typecheck` still green.
Docs: CLAUDE.md's Vitest row and "Where everything lives" pointer
updated; `docs/ARCHITECTURE.md` Tests section now lists the new
suites + a description of what the mock layer covers, and the
"Wider Vitest coverage" entry in the next-steps list is reframed
from "needs a renderer mock" to "pick the next adopter".
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Phase 3 of the refactor plan in docs/ARCHITECTURE.md — the foundation
that unblocks every safe refactor below.
Install
- yarn add -D vitest@3 jsdom @testing-library/dom @testing-library/react
@testing-library/jest-dom
Note: pinned to vitest@3 (not the latest 4.x) because yarn 1's peer
resolution breaks on vitest@4's peer link to vite. With vitest@3 the
existing Vite 8 install resolves cleanly.
Configuration
- vitest.config.mts (new): separate from vite.config.mjs because the
dev/build config wires up renderer SDK aliases that point at sibling
working trees (../renderer, ../Nitro_Render_V3). Tests are written
against pure modules that don't pull in the renderer, so the test
runner uses a smaller alias set.
- tests/setup.ts (new): imports @testing-library/jest-dom/vitest so
custom matchers (toBeInTheDocument, etc.) are available without
per-file imports.
- tsconfig.json: include "tests" so eslint stops complaining about
unparseable files; also makes the IDE see the test files.
- package.json scripts: "test" (one-shot) and "test:watch".
Tests
- tests/WiredCreatorTools.helpers.test.ts (18 cases): covers the pure
helpers extracted in 3c68d97 — createEmptyMonitorSnapshot,
formatMonitorLatestOccurrence (5 time-bucket branches),
formatMonitorHistoryOccurrence, formatVariableTimestamp,
formatMonitorSource (4 branches), normalizeMonitorReason. These are
the most boring-but-easy-to-break functions; locking them down first
is high value, near-zero risk.
- tests/navigatorRoomCreatorStore.test.ts (4 cases): exercises the
Zustand store added in the previous commit — initial state, latch
semantics, 5s auto-reset (with fake timers), and the
"second beginCreate restarts the lockout" invariant. Validates that
the store-based replacement of the let-singleton has the same
observable behavior, plus the new invariant that wasn't possible
before (timer composition under StrictMode double-mount).
Side effect: two non-test source files were converted to `import type`
to keep the test bundle from accidentally pulling in the renderer SDK
transitively:
- src/components/wired-tools/WiredCreatorTools.types.ts
(`import type { AvatarInfoFurni }`)
- src/components/wired-tools/WiredCreatorTools.helpers.ts
(`import type { HotelDateTimeParts, MonitorSnapshot }`)
This is harmless — TypeScript already treated them as type-only —
and improves tree-shaking on build as a side benefit.
Verification
- yarn test -> 2 files, 22 tests passing in ~1.0s.
- yarn eslint on tests/ + the two type-only-import files: 0 errors,
0 warnings.
Migration path
- Next adoption targets: cover useDoorbellState reducer (data hook
split), the new useNitroQuery adapter (timeout/cleanup behavior),
and the smaller pure formatters under src/api/.
- React component tests (via @testing-library/react) deferred until
there's a small mock layer for the renderer SDK. The
@testing-library/* deps are already installed so that PR is
unblocked.
https://claude.ai/code/session_01GrR87LAqnAEyKG2ZbmQt5Q
simoleo89