Split packages/dashboard/app/components/__tests__/ChatView.test.tsx (231 tests,
~24s, one sequential worker) into 3 sibling files sharing ChatView.test-harness,
mirroring the SettingsModal split, so the dashboard chat project parallelizes them:
- ChatView.core.test.tsx (140 tests)
- ChatView.sessions-rooms.test.tsx (40 tests)
- ChatView.mobile.test.tsx (51 tests)
sum = 231 (unchanged)
vi.mock factories stay inline & self-contained per file (delegating them to a
harness export triggers a TDZ ReferenceError because the harness imports
ChatView/../../api). The harness exports fixtures, helpers, the vi.mocked handles,
and installChatViewEnv() (former file-level beforeEach/afterEach).
Fix latent isolation bug in the FN-4327 re-anchor test: the Direct<->Rooms toggle
swaps subtrees in ChatView's render, so `.chat-messages` REMOUNTS on the round
trip. The re-anchor effect correctly targets the freshly-mounted node, whose jsdom
scrollHeight is 0. The pre-split file mocked geometry on the pre-toggle node and
only passed via a timing race against the remount; standalone/split it fails
"expected 500 to be 1200". Install scroll geometry at the prototype level (restored
in finally) so the remounted node reports scrollHeight 1200, making the re-anchor
deterministically observable without weakening the assertion.
vitest.config.ts: repoint dashboard-app-quality-chat to the 3 new files, drop bare
"ChatView" from qualityAppComponentTests/isolatedQualityAppComponentTests, and spread
qualityAppChatOnlyTests into backfillAppExclude (mirroring the settings split) so the
files aren't double-collected by the app backfill lane.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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