From 315bd0ca46cee3420ef01500cf5fa9cdc7fa8b57 Mon Sep 17 00:00:00 2001
From: Dusan Vojacek <dusan.vojacek@direct.cz>
Date: Fri, 12 Jun 2026 12:22:56 +0200
Subject: [PATCH] =?UTF-8?q?v2=20test:=20levn=C3=BD=20sell=20(<opp=20hodnot?=
 =?UTF-8?q?a)=20pos=C3=ADl=C3=A1=20p=C5=99ebytek=20do=20auta,=20ne=20do=20?=
 =?UTF-8?q?s=C3=ADt=C4=9B?=
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Postřeh uživatele — pásma nízkého výkupu před zápornými okny: mechanismus
měkkého cíle to už řeší (opp 1 Kč/kWh > sell 0.3 → auto vyhraje), test
to dokládá: plná domácí baterka + 9 kW PV → ~17 kWh do auta, minimální export.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
---
 backend/tests/test_solver_v2.py | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/backend/tests/test_solver_v2.py b/backend/tests/test_solver_v2.py
index efbaa07..890b33b 100644
--- a/backend/tests/test_solver_v2.py
+++ b/backend/tests/test_solver_v2.py
@@ -273,6 +273,20 @@ class EvOpportunisticTests(unittest.TestCase):
         self.assertLess(delivered, 4000.0 + 200.0)
         self.assertLess(snap["objective_terms"]["ev_opp_wh"][0], 100.0)
 
+    def test_cheap_sell_prefers_car_over_grid(self) -> None:
+        # sell 0.3 < opp 1.0, plná domácí baterka, velký PV přebytek
+        # → přebytek do auta, ne za babku do sítě
+        bat = _battery()
+        slots = [_slot(_BASE, i, buy=3.0, sell=0.3, pv_a=9000, load=500, ev1=True) for i in range(16)]
+        results, _, snap = _solve(
+            slots, battery=bat, soc0=bat.soc_max_wh,  # baterka plná
+            ev_sessions=(self._session(needed=2000.0, headroom=25000.0), None),
+        )
+        delivered = sum((r.ev1_setpoint_w or 0) * 0.25 for r in results)
+        exported = sum(-r.grid_setpoint_w * 0.25 for r in results if r.grid_setpoint_w < 0)
+        self.assertGreater(delivered, 15000.0, "přebytek má téct do auta")
+        self.assertLess(exported, delivered, "prodej za 0.3 nemá vyhrát nad autem")
+
     def test_total_energy_capped_even_at_negative_buy(self) -> None:
         # fix latentního bugu: bez headroom (opp=0) nesmí buy<0 pumpovat nad needed
         slots = [_slot(_BASE, i, buy=-2.0, sell=-1.0, ev1=True, load=300) for i in range(16)]