The DB-backed lane and the two ffmpeg tests skipped SILENTLY when the DB was
unreachable or ffmpeg was absent, so `siftlode check` could print green while
~60 tests never ran. Make the compose lane authoritative:
- SIFTLODE_TEST_REQUIRE_DB=1 in docker-compose.test.yml; conftest.pytest_configure
turns a would-be skip (no Postgres, or no ffmpeg) into a hard UsageError.
- install ffmpeg in Dockerfile.test so the thumbnail/poster tests actually run.
- `-rs` in pytest.ini so skip reasons are always visible.
Add the shared TestClient fixtures the risk-core suites build on: `make_user`
(create + commit a login-ready User), `client` (real auth/session stack, no
current_user override — for login/wallet/epoch), and `as_user` (a client
pre-authenticated as a given user, for tests that aren't exercising login).
The backend had zero tests. This adds 33, all pure (no DB, no network), plus the
harness to run them in the gate:
- backend/Dockerfile.test: the app's deps + pinned pytest/ruff, code bind-mounted at
run time so it always tests the working tree. Isolated from the prod Dockerfile, so
the published image never carries test tooling.
- requirements-dev.txt: pytest==8.4.2, ruff==0.15.21 (the version the gate already
runs) — the backend lane is now pinned, not just host-global.
- tests: normalize_title (de-shout, hashtag strip, emoji drop, trilingual letters
survive); storage sanitize/rel_path/download_filename and the safe_abs_path
traversal guard (../ and absolute-path escapes rejected — verified by mutation);
links HMAC grants (round-trip, wrong-token, tampered sig/exp, expiry) + is_expired;
a DB-free app-assembly smoke (every router wires up, OpenAPI generates).
DB-backed router smoke (auth/feed/downloads) needs a test Postgres + migrations —
deferred. useCardPager needs hook-test infra (jsdom/renderHook) — deferred.
peter