Reveal tripled-in pets but keep the pick secret unless it buys.

internal/game/game_test.go

@@ -2,6 +2,7 @@ package game
 
 import (
 	"slices"
+	"strings"
 	"testing"
 )
 
@@ -225,6 +226,54 @@ func TestTradeTriggersTripleAndBuyEffects(t *testing.T) {
 	}
 }
 
+// A triple makes the three discarded pets public, but keeps the chosen pet
+// secret — unless it has a Buy ability, which performs publicly.
+func TestTradeVisibilityHidesPickUnlessBuyEffect(t *testing.T) {
+	logContains := func(g *Game, sub string) bool {
+		for _, e := range g.Log {
+			if strings.Contains(e.Text, sub) {
+				return true
+			}
+		}
+		return false
+	}
+	trade := func(g *Game, pick Card) *Game {
+		p := current(g)
+		var ids []string
+		for range 3 {
+			c := g.pet("Newt", 1)
+			c.Suit = SuitBlue
+			p.Deck = append(p.Deck, c)
+			ids = append(ids, c.ID)
+		}
+		if err := g.TradeStart(p.ID, ids); err != nil {
+			t.Fatal(err)
+		}
+		g.Pending.Options[0] = pick
+		if err := g.TradeChoose(p.ID, 0); err != nil {
+			t.Fatal(err)
+		}
+		return g
+	}
+
+	// Discarded trio is named; an effect-less pick stays hidden.
+	g, _, _ := testGame(t)
+	trade(g, g.pet("SecretPet", 3))
+	if !logContains(g, "Newt") {
+		t.Fatal("the discarded pets should be public in the log")
+	}
+	if logContains(g, "SecretPet") {
+		t.Fatal("a pick with no buy ability must stay hidden")
+	}
+
+	// A pick with a Buy ability (Otter) is revealed.
+	g2, _, _ := testGame(t)
+	trade(g2, g2.realPet(t, "Otter"))
+	if !logContains(g2, "Otter") {
+		t.Fatal("a pick with a buy ability should be revealed in the log")
+	}
+}
+
 func TestBuyWormAddsTwoApples(t *testing.T) {
 	g, _, _ := testGame(t)
 	p := current(g)