Initial pass at Golden Pack.

internal/game/regression_test.go

@@ -0,0 +1,26 @@
+package game
+
+import "testing"
+
+// Regression (improvements.txt): a Crocodile set aside must still throw its
+// last-pet volley when the enemy plays their final pet, even though the
+// Crocodile's own side is already out of pets. Previously the "battle over"
+// check fired first and swallowed the parting shot.
+func TestCrocodileLastPetVolleyFiresWhenOwnerOut(t *testing.T) {
+	g, _, _ := testGame(t)
+	g.RollDie = func() int { return 2 } // 3 rocks -> 6 damage
+	res := forceBattle(t, g,
+		[]Card{g.pet("Killer", 4), g.pet("Last", 3)}, // seat 0 plays its last pet
+		[]Card{g.realPet(t, "Crocodile")},            // seat 1's Croc faints, sets aside
+	)
+	// Killer trades with Crocodile (set aside). Seat 0 then plays its last pet,
+	// and the Crocodile's 3 rocks (roll 6) pelt it dead — turning a win into a
+	// mutual knockout.
+	rocks := eventsOfType(res, "rock")
+	if len(rocks) != 1 || rocks[0].Seat != 1 || rocks[0].Roll != 6 || !rocks[0].TargetDied {
+		t.Fatalf("Crocodile should volley the last pet for 6: %+v", rocks)
+	}
+	if res.WinnerSeat != -1 {
+		t.Fatalf("both sides should be out (draw), got winner %d", res.WinnerSeat)
+	}
+}