example add code

examples/fuzz_graph.nim

@@ -99,6 +99,12 @@ when defined(runFuzzTests) and isMainModule:
         x.nodes[6].edges.len == 0 and
         x.nodes[7].edges.len == 0:
       doAssert false
+    # Here you could call library functions and check invariants.
+    # Such as when removing edges, the number of nodes remains the same.
+    #var x = x
+    #let oldLen = x.nodes.len
+    #x.deleteEdge(1, 2)
+    #doAssert oldLen == x.nodes.len
 
   defaultMutator(fuzzTarget)