diff --git a/experiments/test_exp_cdc.sh b/experiments/test_exp_cdc.sh
index 76c8af6d08b42cd0948c5d331eb400baaa622f18..2881a4fa44ed1940fd442736dc6600ee7f17e0f5 100755
--- a/experiments/test_exp_cdc.sh
+++ b/experiments/test_exp_cdc.sh
@@ -41,7 +41,7 @@ if True:
 
   import json
   from graph_tools.misc import graph_to_gadget
-  from graph_tools.parameters import CircuitDoubleCover
+  from graph_tools.parameters import CircuitDoubleCover, UnderlayingGraph
   from sage.all import Graph
   from parmap import parmap
 
@@ -50,6 +50,7 @@ if True:
     gadget = graph_to_gadget(G)
     real = gadget.eval(CircuitDoubleCover)
     exp = 2**(G.num_verts() // 2) // 2
+    assert G.is_isomorphic(gadget.eval(UnderlayingGraph))
   
     j = {
       "cdc_count": real,