1 files changed, 37 insertions, 0 deletions
diff --git a/internal/casino/money_regression_test.go b/internal/casino/money_regression_test.go
index 79f9b46..31cd0e6 100644
--- a/internal/casino/money_regression_test.go
+++ b/internal/casino/money_regression_test.go
@@ -249,3 +249,40 @@ func TestSlotsStakeResolvesOnlyAfterFullRound(t *testing.T) {
 		t.Errorf("refundAll double-paid a completed round: paid %d -> %d", paidBefore, wallet.paid)
 	}
 }
+
+// TestSlotsSecondSpinDoesNotResolveFailedPayoutStake: a spin whose payout
+// could not be persisted leaves its stake OPEN as recovery evidence. The
+// next round must resolve only its own stake — a player-wide ResolveStakes
+// would silently erase the failed round's evidence and drop the refund.
+func TestSlotsSecondSpinDoesNotResolveFailedPayoutStake(t *testing.T) {
+	machine := newMachine(1, MachineConfig{ID: "slots", Game: GameSlots, SpinTicks: 1}, newTestRand())
+	wallet := &failingPayoutWallet{testWallet{credits: 100}}
+	machine.join("alice")
+	machine.setBet("alice", 10, wallet)
+	machine.spin = &SlotSpin{Payout: 20} // winning spin the wallet refuses to pay
+	for i := 0; i < 20 && machine.phase != machineReady; i++ {
+		machine.tick()
+	}
+	if len(wallet.open) != 1 {
+		t.Fatal("setup: a failed payout must leave the stake open")
+	}
+
+	// A second, losing round must not resolve the first (still-open) stake.
+	machine.setBet("alice", 10, wallet)
+	machine.spin = &SlotSpin{}
+	for i := 0; i < 20 && machine.phase != machineReady; i++ {
+		machine.tick()
+	}
+	if len(wallet.open) != 1 {
+		t.Fatalf("the second spin resolved the failed-payout stake; open=%d, want 1", len(wallet.open))
+	}
+
+	// The preserved stake is still refundable at shutdown.
+	machine.refundAll()
+	if len(wallet.open) != 0 {
+		t.Fatalf("failed-payout stake was not refunded: open=%+v", wallet.open)
+	}
+	if got := wallet.credits + wallet.paid; got != 90 {
+		t.Fatalf("balance %d, want 90 (first stake refunded, second leg lost)", got)
+	}
+}