diff -r 456fa5bc3256 -r 819ca5b50de0 test/digraph_test.cc
--- a/test/digraph_test.cc	Sun Aug 23 11:13:21 2009 +0200
+++ b/test/digraph_test.cc	Tue Sep 29 10:21:51 2009 +0200
@@ -286,6 +286,14 @@
   G.addArc(G.addNode(), G.addNode());
 
   snapshot.restore();
+  snapshot.save(G);
+
+  checkGraphNodeList(G, 4);
+  checkGraphArcList(G, 4);
+
+  G.addArc(G.addNode(), G.addNode());
+
+  snapshot.restore();
 
   checkGraphNodeList(G, 4);
   checkGraphArcList(G, 4);