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modbison/backend/tests/test_discovery_trending.py
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Python

"""API and heuristic tests for trending discovery sort.
docs/planning/discovery.md (task 33706f401ad9).
"""
from datetime import datetime, timedelta, timezone
import pytest
from fastapi.testclient import TestClient
from sqlalchemy.ext.asyncio import async_sessionmaker, create_async_engine
from sqlalchemy.pool import NullPool
from app.config import settings
from app.main import app
from app.models.world_visit import WorldVisit
def _register(client: TestClient, username: str) -> tuple[int, dict[str, str]]:
resp = client.post(
"/api/auth/register",
json={
"username": username,
"email": f"{username}@example.com",
"password": "secret123",
"date_of_birth": "1990-01-01",
},
)
assert resp.status_code == 201, resp.text
token = resp.json()["access_token"]
headers = {"Authorization": f"Bearer {token}"}
me = client.get("/api/users/me", headers=headers)
assert me.status_code == 200, me.text
return me.json()["id"], headers
def _session_factory():
engine = create_async_engine(settings.DATABASE_URL, poolclass=NullPool)
return engine, async_sessionmaker(engine, expire_on_commit=False)
@pytest.mark.asyncio
async def test_trending_sort_heuristic_and_zero_visits():
client = TestClient(app)
uid, headers = _register(client, "creator_trending_1")
# Create 3 worlds
wA = client.post(
"/api/worlds/",
headers=headers,
json={"name": "Trending Hot World", "visibility": "public", "category": "Action"},
).json()
wB = client.post(
"/api/worlds/",
headers=headers,
json={"name": "Older Mild World", "visibility": "public", "category": "Action"},
).json()
wC = client.post(
"/api/worlds/",
headers=headers,
json={"name": "Zero Visit World", "visibility": "public", "category": "Action"},
).json()
engine, sf = _session_factory()
now = datetime.now(timezone.utc)
try:
async with sf() as session:
# World A: 3 visits within last 2 hours (weight 3 each = score 9)
for i in range(3):
session.add(
WorldVisit(
world_id=wA["id"],
anonymous_token=f"hot_visitor_{i}",
visited_at=now - timedelta(hours=1, minutes=i),
)
)
# World B: 1 visit 5 days ago (weight 1 = score 1)
session.add(
WorldVisit(
world_id=wB["id"],
anonymous_token="old_visitor",
visited_at=now - timedelta(days=5),
)
)
# World C: zero visits
await session.commit()
finally:
await engine.dispose()
# Query with sort=trending
resp = client.get("/api/discovery/worlds?sort=trending&category=Action")
assert resp.status_code == 200, resp.text
items = resp.json()["items"]
# Verify order: wA should be first, wB second, wC third
ids = [item["id"] for item in items]
assert wA["id"] in ids
assert wB["id"] in ids
assert wC["id"] in ids
idxA = ids.index(wA["id"])
idxB = ids.index(wB["id"])
idxC = ids.index(wC["id"])
assert idxA < idxB < idxC, f"Expected order A ({idxA}) < B ({idxB}) < C ({idxC})"