// Copyright 2013 the V8 project authors. All rights reserved.// Copyright (C) 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.//// Redistribution and use in source and binary forms, with or without// modification, are permitted provided that the following conditions// are met:// 1. Redistributions of source code must retain the above copyright// notice, this list of conditions and the following disclaimer.// 2. Redistributions in binary form must reproduce the above copyright// notice, this list of conditions and the following disclaimer in the// documentation and/or other materials provided with the distribution.//// THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE// DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY// DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON// ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.description("Test to ensure correct behaviour of Object.keys");shouldBe("Object.keys({})","[]");shouldBe("Object.keys({a:null})","['a']");shouldBe("Object.keys({a:null, b:null})","['a', 'b']");shouldBe("Object.keys({b:null, a:null})","['b', 'a']");shouldBe("Object.keys([])","[]");shouldBe("Object.keys([null])","['0']");shouldBe("Object.keys([null,null])","['0','1']");shouldBe("Object.keys([null,null,,,,null])","['0','1','5']");shouldBe("Object.keys({__proto__:{a:null}})","[]");shouldBe("Object.keys({__proto__:[1,2,3]})","[]");shouldBe("x=[];x.__proto__=[1,2,3];Object.keys(x)","[]");