js/src/jit-test/tests/debug/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);