feat(stock-lab): Momentum20 노드 — N일 수익률 백분위

stock-lab/app/test_screener_nodes_momentum.py

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+import datetime as dt
+import pandas as pd
+
+from app.screener.engine import ScreenContext
+from app.screener.nodes.momentum import Momentum20
+from app.screener._test_fixtures import make_master, make_prices, make_flow
+
+
+def _ctx(master, prices, flow):
+    return ScreenContext(master=master, prices=prices, flow=flow,
+                         kospi=pd.Series(dtype=float, name="kospi"),
+                         asof=dt.date(2026, 5, 12))
+
+
+def test_higher_momentum_gets_higher_score():
+    asof = dt.date(2026, 5, 12)
+    master = make_master(["UP", "DN"])
+    up = make_prices(["UP"], days=30, asof=asof, trend_pct=0.5)
+    dn = make_prices(["DN"], days=30, asof=asof, trend_pct=-0.3)
+    prices = pd.concat([up, dn], ignore_index=True)
+    flow = make_flow(["UP", "DN"], days=30, asof=asof)
+
+    out = Momentum20().compute(_ctx(master, prices, flow), {"window_days": 20})
+    assert out["UP"] > out["DN"]