feat(social): add listening activity, shared rooms and modern chat

services/recommender/tests/test_engine.py

@@ -45,6 +45,23 @@ def profile(**kw: object) -> Profile:
     return Profile(**base)  # type: ignore[arg-type]
 
 
+def test_friend_signal_is_bounded_and_respects_negative_feedback() -> None:
+    index = library()
+    blocked = {"t0-0", "t1-0"}
+    picks = build_batch(index, profile(disliked=blocked), Session(), [], n=5,
+                        friend_ids=index.ids, rng=np.random.default_rng(8))
+    assert not blocked.intersection(p.id for p in picks)
+    assert sum(p.source == "friends" for p in picks) <= 1
+    assert len(picks) == 5
+
+
+def test_empty_friend_signal_does_not_change_ranking() -> None:
+    index = library()
+    first = build_batch(index, profile(), Session(), [], rng=np.random.default_rng(17))
+    second = build_batch(index, profile(), Session(), [], friend_ids=[], rng=np.random.default_rng(17))
+    assert [p.id for p in first] == [p.id for p in second]
+
+
 def cluster(track_id: str) -> int:
     return int(track_id[1])