Make restart work without calling stop first

src/turtle/env/model/TestNode.d

@@ -128,16 +128,25 @@ import ocean.task.Task;
         Restarts the fake node, reopening the listening socket on the same port
         determined in the initial call to start().
 
-        Notes:
-            1. Restarting the node *does not* clear any data in its storage
-               engine. To do that, call clear().
-            2. You must call stop() first, before calling restart().
+        Note: Restarting the node *does not* clear any data in its storage
+        engine. To do that, call clear().
 
     ***************************************************************************/
-// TODO: make this work without requiring stop first
+
     public void restart ( )
     {
-        verify(this.state == State.Stopped, "Node has not been stopped");
+        with ( State ) switch ( this.state )
+        {
+            case Stopped:
+                break;
+            case Running:
+                this.stop();
+                break;
+            case Init:
+            default:
+                verify(false, "Node has not been started yet");
+                break;
+        }
 
         this.restartListeners();
         this.register(theScheduler.epoll);