Bind Feishu identity to OpenVPN sessions and refine management UI

backend/internal/sessionmgr/sessionmgr_test.go

@@ -0,0 +1,38 @@
+package sessionmgr
+
+import (
+	"testing"
+
+	"vpn-platform/backend/internal/model"
+	"vpn-platform/backend/internal/store"
+)
+
+func TestDisconnectLoggedOnceWhenTunnelHasNoClients(t *testing.T) {
+	previous := store.DB
+	t.Cleanup(func() {
+		if store.DB != nil {
+			if db, err := store.DB.DB(); err == nil {
+				_ = db.Close()
+			}
+		}
+		store.DB = previous
+	})
+	if err := store.Init(t.TempDir()); err != nil {
+		t.Fatal(err)
+	}
+	tunnel := model.Tunnel{Name: "audit-test", Protocol: "openvpn"}
+	if err := store.DB.Create(&tunnel).Error; err != nil {
+		t.Fatal(err)
+	}
+	client := ClientInfo{Username: "tenant:ou_123", RealAddress: "203.0.113.1:1234", RxBytes: 42, TxBytes: 84}
+	SyncSessions(tunnel.ID, "openvpn", []ClientInfo{client})
+	SyncSessions(tunnel.ID, "openvpn", nil)
+	SyncSessions(tunnel.ID, "openvpn", nil)
+	var logs []model.ConnectionLog
+	if err := store.DB.Where("tunnel_id = ?", tunnel.ID).Order("id").Find(&logs).Error; err != nil {
+		t.Fatal(err)
+	}
+	if len(logs) != 2 || logs[0].Event != "connect" || logs[1].Event != "disconnect" || logs[1].Username != client.Username {
+		t.Fatalf("expected one connect and one disconnect with stable subject, got %+v", logs)
+	}
+}