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refactor(brand): rename F∆I -> Ch∆In + hub binary fai -> chain

Studio follows the platform rename: product branding F∆I -> Ch∆In in UI
strings, command examples fai -> chain, and — critically — the spawned
hub binary path ~/.fai/bin/fai -> ~/.fai/bin/chain so Studio launches
the renamed binary. The fai_* Dart identifiers (FaiLog, widget files,
the generated SDK) stay = vendor/internal namespace. flutter analyze:
no issues.

Signed-off-by: flemming-it <stefan.a.flemming@googlemail.com>

2026-06-15 16:22:22 +02:00

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Integration tests

These tests spin up a real chain serve subprocess against a fresh temp dir and exercise Studio's Hub-facing data layer against it. They cover the "kind of regression that survives unit tests because the system-shape only manifests across the gRPC boundary".

Status

Scaffold. One canonical test (capabilities). The harness is production-quality (proper teardown, idempotent, port-clean) so new tests slot in by importing hub_fixture.dart and calling HubFixture.start() / dispose() in setUp / tearDown.

What's NOT here yet:

A full "install dep → run echo → assert title" scenario. The harness can do it (install_module is a real RPC), but building the fixture for module-bundle downloads against a hermetic local registry is its own scaffold. Tracked as follow-up to S-21.
Studio-side widget testing against the live hub. The flutter integration_test package supports it (testWidgets + IntegrationTestWidgetsFlutterBinding), but pumping a full StudioApp against a real gRPC channel needs binding.enableSurfaceBindingHack() ceremony we haven't designed yet.

Running

cd fai_studio
flutter test test/integration/

Prereq: a fai binary on PATH or at ../fai_platform/target/release/fai. The harness skips with a clear message when neither exists, so this command does not fail on a fresh checkout — it just reports skipped tests.

To get the binary:

cd ../fai_platform
cargo build --release --bin fai

First-time-start gotcha

A cold chain serve spends its first ~30s building the curated-model database and initialising SQLite migrations. HubFixture.start() waits up to 60s by default; if your local hub takes longer the first time, run chain serve once by hand against any temp FAI_DATA_DIR to warm the per-user cargo / SBOM caches:

FAI_DATA_DIR=/tmp/fai_warmup chain serve --bind 127.0.0.1:0
# wait for "hub started", Ctrl-C

Subsequent integration-test runs are quick.

Not yet wired into CI

.forgejo/workflows/ci.yml doesn't run these yet. Adding them needs an artifact-passing pattern: the platform build job publishes target/release/fai as a CI artifact; the studio test job consumes it. Pattern is straightforward once we want it; it's deferred because we don't yet have enough integration tests to justify the CI runtime.

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