michael@0: // Basic preventExtensions test.
michael@0: 
michael@0: var g = newGlobal();
michael@0: var obj = g.eval("({x: 1})");
michael@0: assertEq(g.Object.isExtensible(obj), true);
michael@0: 
michael@0: var dbg = new Debugger;
michael@0: var gw = dbg.addDebuggee(g);
michael@0: var objw = gw.makeDebuggeeValue(obj);
michael@0: assertEq(objw.isExtensible(), true);
michael@0: 
michael@0: assertEq(objw.preventExtensions(), undefined);
michael@0: assertEq(g.Object.isExtensible(obj), false);
michael@0: assertEq(objw.isExtensible(), false);
michael@0: 
michael@0: // Calling preventExtensions again has no effect.
michael@0: assertEq(objw.preventExtensions(), undefined);