michael@0: /* Any copyright is dedicated to the Public Domain.
michael@0:    http://creativecommons.org/publicdomain/zero/1.0/ */
michael@0: 
michael@0: // Test that sessionrestore handles cycles in the shentry graph properly.
michael@0: //
michael@0: // These cycles shouldn't be there in the first place, but they cause hangs
michael@0: // when they mysteriously appear (bug 687710).  Docshell code assumes this
michael@0: // graph is a tree and tires to walk to the root.  But if there's a cycle,
michael@0: // there is no root, and we loop forever.
michael@0: 
michael@0: let stateBackup = ss.getBrowserState();
michael@0: 
michael@0: let state = {windows:[{tabs:[{entries:[
michael@0:   {
michael@0:     docIdentifier: 1,
michael@0:     url: "http://example.com",
michael@0:     children: [
michael@0:       {
michael@0:         docIdentifier: 2,
michael@0:         url: "http://example.com"
michael@0:       }
michael@0:     ]
michael@0:   },
michael@0:   {
michael@0:     docIdentifier: 2,
michael@0:     url: "http://example.com",
michael@0:     children: [
michael@0:       {
michael@0:         docIdentifier: 1,
michael@0:         url: "http://example.com"
michael@0:       }
michael@0:     ]
michael@0:   }
michael@0: ]}]}]}
michael@0: 
michael@0: function test() {
michael@0:   registerCleanupFunction(function () {
michael@0:     ss.setBrowserState(stateBackup);
michael@0:   });
michael@0: 
michael@0:   /* This test fails by hanging. */
michael@0:   ss.setBrowserState(JSON.stringify(state));
michael@0:   ok(true, "Didn't hang!");
michael@0: }