node/watchers/mock: add l1finalizer

node/pkg/watchers/mock/config.go

@@ -20,6 +20,7 @@ type WatcherConfig struct {
 	ObservationDb       ObservationDb                   // If the watcher receives a re-observation request with a TxHash in this map, it will make the corresponding observation in this map.
 	MockSetC            <-chan *common.GuardianSet
 	L1FinalizerRequired watchers.NetworkID // (optional)
+	l1Finalizer         interfaces.L1Finalizer
 }
 
 func (wc *WatcherConfig) GetNetworkID() watchers.NetworkID {
@@ -35,7 +36,7 @@ func (wc *WatcherConfig) RequiredL1Finalizer() watchers.NetworkID {
 }
 
 func (wc *WatcherConfig) SetL1Finalizer(l1finalizer interfaces.L1Finalizer) {
-	// empty
+	wc.l1Finalizer = l1finalizer
 }
 
 func (wc *WatcherConfig) Create(

node/pkg/watchers/mock/watcher.go

@@ -19,6 +19,11 @@ func NewWatcherRunnable(
 	return func(ctx context.Context) error {
 		logger := supervisor.Logger(ctx)
 		supervisor.Signal(ctx, supervisor.SignalHealthy)
+
+		if c.L1FinalizerRequired != "" && c.l1Finalizer == nil {
+			logger.Fatal("Mock watcher: L1FinalizerRequired but not set.")
+		}
+
 		logger.Info("Mock Watcher running.")
 
 		for {