fix: harden group lifecycle and registration writes

server/topic_test.go

@@ -613,6 +613,26 @@ func TestVideoCallStaleUnanswered(t *testing.T) {
 	}
 }
 
+func TestNormalizeCallEventAliases(t *testing.T) {
+	for _, event := range []string{"hang-up", "hangup", "hang_up", "finish", "finished", "end", "ended", "disconnect", "disconnected"} {
+		if got := normalizeCallEvent(event); got != constCallEventHangUp {
+			t.Fatalf("normalizeCallEvent(%q) = %q, want %q", event, got, constCallEventHangUp)
+		}
+		if !isDetachedCallEvent(event) {
+			t.Fatalf("isDetachedCallEvent(%q) = false, want true", event)
+		}
+	}
+	if got := normalizeCallEvent(constCallEventAccept); got != constCallEventAccept {
+		t.Fatalf("normalizeCallEvent(%q) = %q, want %q", constCallEventAccept, got, constCallEventAccept)
+	}
+	if !isDetachedCallEvent(constCallEventAccept) {
+		t.Fatalf("isDetachedCallEvent(%q) = false, want true", constCallEventAccept)
+	}
+	if isDetachedCallEvent("unknown") {
+		t.Fatal("isDetachedCallEvent(\"unknown\") = true, want false")
+	}
+}
+
 func TestHandleBroadcastDataGroup(t *testing.T) {
 	topicName := "grp-test"
 	numUsers := 4