mechanic: clump stat gains on prime stats only

tests/test_mechanic.py

@@ -1,7 +1,9 @@
 import datetime
 
+import pytest
+
 from pqcli import random
-from pqcli.config import StatType
+from pqcli.config import PRIME_STATS, StatType
 from pqcli.game_data import load_game_data
 from pqcli.mechanic import Player, Simulation, Stats, level_up_time
 
@@ -36,3 +38,18 @@ def test_quest_length_matches_upstream() -> None:
         lengths.add(simulation.player.quest_book.quest_bar.max_)
     assert min(lengths) == 50
     assert max(lengths) == 149
+
+
+def test_weighted_stat_gain_skips_hp_and_mp(
+    monkeypatch: pytest.MonkeyPatch,
+) -> None:
+    # the "favor the best stat" branch only covers prime stats, pq-web 48c42e6
+    monkeypatch.setattr(random, "odds", lambda chance, out_of: False)
+    random.seed("stats")
+    player = make_simulation().player
+    player.stats.increment(StatType.hp_max, 1000)
+    for _ in range(500):
+        player.win_stat()
+    assert player.stats[StatType.hp_max] == 1010
+    assert player.stats[StatType.mp_max] == 10
+    assert sum(player.stats[stat] for stat in PRIME_STATS) == 60 + 500