Object-preventExtensions-01.js

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// Basic preventExtensions test.

var g = newGlobal({newCompartment: true});

var obj = g.eval("({x: 1})");

assertEq(g.Object.isExtensible(obj), true);

var dbg = new Debugger;

var gw = dbg.addDebuggee(g);

var objw = gw.makeDebuggeeValue(obj);

assertEq(objw.isExtensible(), true);

assertEq(objw.preventExtensions(), undefined);

assertEq(g.Object.isExtensible(obj), false);

assertEq(objw.isExtensible(), false);

// Calling preventExtensions again has no effect.

assertEq(objw.preventExtensions(), undefined);