1 files changed, 55 insertions, 0 deletions
diff --git a/internal/game/shutdown_admission_test.go b/internal/game/shutdown_admission_test.go
new file mode 100644
index 0000000..6aa4be5
--- /dev/null
+++ b/internal/game/shutdown_admission_test.go
@@ -0,0 +1,55 @@
+package game
+
+// Shutdown-admission regression: once shutdown has begun, session input must
+// never mutate game state — not during the drain window, and especially not
+// after the owner has stopped (the transports keep draining until they
+// close, so an accepted line would execute concurrently with the shutdown
+// sequence or after the final-save barrier).
+
+import (
+	"testing"
+
+	"thehouseoficarus/internal/net"
+)
+
+func TestShutdownRejectsSessionInput(t *testing.T) {
+	h := newHarness(t)
+	h.seedAccount("alice", "pw", false)
+	h.seedCharacter("alice", "alice")
+	sess, _ := h.connect("alice")
+	sess.State = net.StateGame
+	h.g.setShuttingDown()
+	h.g.stopOwner()
+
+	// The network listeners are closed only AFTER the owner stops, so
+	// connections can still submit lines through the production entry
+	// point. Every one of them must be rejected.
+	h.g.HandleSessionOnOwner(sess, "look")
+
+	// A durable mutation gives an unambiguous admission check: description
+	// input would rewrite the character.
+	sess.State = net.StateChangeDesc
+	h.g.HandleSessionOnOwner(sess, "Input after final save")
+	if sess.Player.Description == "Input after final save" {
+		t.Error("session input still mutates character after shutdown/owner stop")
+	}
+}
+
+func TestShutdownRejectsInputDuringDrain(t *testing.T) {
+	h := newHarness(t)
+	h.seedAccount("alice", "pw", false)
+	h.seedCharacter("alice", "alice")
+	sess, _ := h.connect("alice")
+	sess.State = net.StateGame
+	h.g.setShuttingDown()
+
+	// During the drain window the owner is still alive, but new input is
+	// already rejected: only work accepted before shutdown executes.
+	h.g.HandleSessionOnOwner(sess, "look")
+	sess.State = net.StateChangeDesc
+	h.g.HandleSessionOnOwner(sess, "Input during drain")
+	if sess.Player.Description == "Input during drain" {
+		t.Error("session input accepted after shutdown began")
+	}
+	h.barrier()
+}