subsonic.contract.test.ts (21): parseSubsonicEntityStarRating (userRating
first then rating fallback, numeric-string coercion, undefined for null /
NaN / non-numeric), libraryFilterParams (empty without active server, empty
on "all" filter, returns musicFolderId on specific filter), getClient
(throws without a server, returns baseUrl + auth params, rotates token + salt
across calls), coverArtCacheKey (serverId:cover:id:size shape, "_" fallback
without active server, no ephemeral salt embedded -- stays cacheable),
buildStreamUrl (URL shape + Subsonic auth params: id u t s v=1.16.1
c=psysonic/* f=json, rotates t/s across calls so Rust matches by id, special
character ids encoded once not twice), buildCoverArtUrl (default size=256),
buildDownloadUrl (download.view path), trailing-slash + scheme handling on
base URL.
resolvePlaybackUrl.test.ts (15): precedence offline > hot-cache > stream
(first priority wins even when later sources also have the track), forwards
trackId + serverId to both stores. getPlaybackSourceKind for offline / hot
/ stream / engine-preload-hint cases. streamUrlTrackId parser (id from
stream.view query, null for non-stream URLs / no query / missing id, decodes
URL-encoded ids, manual-query fallback for relative paths).
copyEntityShareLink.test.ts (5): writes a psysonic2-prefixed payload that
round-trips, returns false without an active server, returns false on
empty / whitespace id, trims surrounding whitespace before encoding,
propagates clipboard-failure return.
Gate broadens with src/utils/resolvePlaybackUrl.ts (95.8 %) +
src/utils/copyEntityShareLink.ts (100 %). subsonic.ts at 12.7 % stays out
-- the URL-builder + parser surface this PR covers is the structural part;
the async API endpoints need axios mocking, deferred to a follow-up.
authStore.ts (79 %) and playerStore.ts (40 %) deferred-list comments
updated to reflect F2 + F1 actuals.
Frank Stellmacher