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yellowjacket/.pi/skills/yellowjacket-dev/references/fixtures.md
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feat(harness): agent-drivable dev harness and CI that gates
A coding agent could develop this repo's Go packages and could not
develop the application: every path to running YellowJacket ended in a
blocking GTK window, so 265 bound methods, 46 events, 33 component
directories and 13 stores had exactly one form of verification
available — `tsc --noEmit`.

The unlock is that `wails dev`'s dev server on :34115 serves the real
frontend with the real generated bindings against the same Go backend a
desktop window attaches to, so a plain Chromium under Xvfb gets a fully
functional app. Four test tiers now exist, cheapest first:

- `make ui-test` — 313 Vitest tests in a real browser in ~2 s, no app,
  no backend, no display. Works because `frontend/wailsjs/` is a pure
  passthrough to `window.go`/`window.runtime`, so faking just those two
  globals runs the real bindings and the real store code.
- `make test` — services in-process, asserting on the payload the
  frontend would receive, via a new `events.Emit` wrapper.
- `make dev-headless` + `playwright-cli` — the real app, driven
  interactively, with an event bridge on `window.__yjEvents` and a
  dev-only control surface at `/__test/`.
- `make e2e` — 19 of those flows frozen as Playwright specs.

`events.Emit(ctx, …)` replaces all 35 direct `runtime.EventsEmit` call
sites: wails' `getEvents` `log.Fatalf`s on any context without its
runtime, so those paths could not run under test and a background
worker could take the app down. Four packages had each hand-rolled the
same guard; nine more guarded on `ctx != nil`, which does not help.
`TestNoDirectRuntimeEmits` fails the build on a new one.

Fixtures are generated, not committed (`make testdata`), and seeds are
built by *running the app* — never by hand-writing config and DB rows,
which would be a second description of a valid YJ_HOME.

`.gitea/workflows/ci.yml` is the first workflow here that tests
anything; the other three only package, so `gitea_ci` reported only
packaging jobs and misled anyone asking whether a push was healthy.
Both jobs were prototyped to green in a bare ubuntu:24.04 container
before the YAML was written, which immediately caught `make lint`
linting three configurations that nothing builds: all three passes
omitted `webkit2_41`, so wails resolved webkit2gtk-4.0 — which Arch
still ships and Ubuntu 24.04 dropped.

Operational instructions live in `.pi/skills/yellowjacket-dev/`,
measured discoveries in `.planning/NOTES.md`, and architecture in
`CLAUDE.md` — split by tense, not by topic, because a topical split
gives every new fact two plausible homes. `make skill-check` fails a
commit if the skill cites a make target that does not exist.
2026-08-10 23:20:42 -04:00

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The fixture library

test_data/music_library_test/ is generated, not committed: make testdata (~1 s) builds 31 deterministic tracks across MP3, FLAC, Ogg Vorbis and WAV. make testdata-force rebuilds unconditionally, make testdata-clean deletes it. make test and make sandbox-seed depend on it, so it is rarely run by hand.

Tests that need it fetch it through internal/testfixtures and skip themselves when it has not been generated.

Select by case, never by path

m := testfixtures.Load(t)
paths := m.Case(t, testfixtures.CaseCoverDedup)
track := m.Track(t, rel)

Cases: cover-dedup, multi-disc, various-artists, flac-album, ogg-album, wav-tracks, partial-tags, unicode, duplicates, edge-lengths, broken.

Two invariants worth not breaking:

  • The clean library is exactly 31 tracks, because sandbox-seed verifies the scan against that count. Deliberately malformed files live in a sibling root, test_data/music_library_broken/ (m.BrokenPath()), so the scanner never sees them.
  • Tags are written by backend/tagwriter, not by ffmpeg (which encodes with -map_metadata -1). Fixture and reader therefore cannot drift into agreeing with each other and disagreeing with reality.

The manifest (test_data/music_library_test.manifest.json, outside the scanned root) hashes the spec — paths, formats, durations, tags, cover identity — not the bytes, because ffmpeg stamps encoder version strings and identical specs produce different bytes on different builds.

In e2e specs

  • Every fixture except one is 26 seconds. A spec that starts playback and then clicks pause races the track ending and fails against a correct UI. Use LONG_TRACK (90 s, edge-lengths) exported from e2e/support/fixtures.ts.
  • WAV tracks scan in untitled. backend/tagwriter writes WAV tags into a RIFF id3 chunk and dhowden/tag has no RIFF parser, so there is no "Field Recordings" artist in the Artists view. This is a known open bug pinned by TestWAVTagsAreNotReadableYet; do not "fix" a spec by asserting the broken behaviour elsewhere.

Seeds

make sandbox-seed NAME=default   # build (boots a fresh YJ_HOME and drives the app)
make sandbox-seeds               # list
make dev-headless SEED=default   # restore into a run

A seed is a tarred YJ_HOME produced by running the app: fresh home → real AddLibrary binding → poll until the real scan reports the manifest's track count → SIGTERM so shutdown hooks persist state → tar. Never hand-write one. Seeding points YJ_CORE_INDEX_URL at a dead address on purpose, so no seed depends on what the explore artifact server happened to be serving.

Rebuild a seed after any schema change, or the restored database is migrated on open in a way the seed's author never saw.