test: verify SoulseekAdapter through the pipeline and full ranking order

worker/tests/test_soulseek_pipeline.py

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+from lyra_worker.adapters.qobuz import QobuzAdapter
+from lyra_worker.adapters.soulseek import SoulseekAdapter
+from lyra_worker.adapters.youtube import YouTubeAdapter
+from lyra_worker.claim import claim_next
+from lyra_worker.pipeline import run_pipeline
+from tests.conftest import insert_request
+from tests.test_qobuz_adapter import FakeQobuzClient
+from tests.test_soulseek_adapter import FakeSlskdClient
+from tests.test_youtube_adapter import FakeYtClient
+
+
+def test_soulseek_flows_through_pipeline(conn):
+    job_id = insert_request(conn, artist="John Mayer", album="Continuum")
+    claim_next(conn)
+    run_pipeline(conn, job_id, [SoulseekAdapter(FakeSlskdClient())], dest_root="/tmp/lib")
+    with conn.cursor() as cur:
+        cur.execute('SELECT state, "currentStage" FROM "Job" WHERE id = %s', (job_id,))
+        assert cur.fetchone() == ("imported", "import")
+        cur.execute('SELECT source, format FROM "LibraryItem" WHERE artist = %s', ("John Mayer",))
+        assert cur.fetchone() == ("soulseek", "FLAC")
+
+
+def test_soulseek_flac_beats_youtube(conn):
+    yt_results = [{"source_ref": "yt1", "title": "Continuum", "artist": "John Mayer", "track_count": 12}]
+    job_id = insert_request(conn, artist="John Mayer", album="Continuum")
+    claim_next(conn)
+    run_pipeline(
+        conn, job_id,
+        [SoulseekAdapter(FakeSlskdClient()), YouTubeAdapter(FakeYtClient(results=yt_results))],
+        dest_root="/tmp/lib",
+    )
+    with conn.cursor() as cur:
+        cur.execute('SELECT source FROM "Candidate" WHERE "jobId" = %s AND chosen = true', (job_id,))
+        assert cur.fetchone()[0] == "soulseek"  # FLAC (class 2) beats YouTube lossy (class 1)
+
+
+def test_qobuz_beats_soulseek(conn):
+    job_id = insert_request(conn, artist="John Mayer", album="Continuum")
+    claim_next(conn)
+    run_pipeline(
+        conn, job_id,
+        [QobuzAdapter(FakeQobuzClient()), SoulseekAdapter(FakeSlskdClient())],
+        dest_root="/tmp/lib",
+    )
+    with conn.cursor() as cur:
+        cur.execute('SELECT source FROM "Candidate" WHERE "jobId" = %s AND chosen = true', (job_id,))
+        # Qobuz hi-res (class 3) OR same-class-lower-tier both put Qobuz first; Qobuz wins.
+        assert cur.fetchone()[0] == "qobuz"