src/v8/test/mjsunit/third_party/object-keys/object-keys.js

// Copyright (c) 2006 Apple Computer, Inc. All rights reserved.
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// modification, are permitted provided that the following conditions
// are met:
//
// 1. Redistributions of source code must retain the above copyright
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// with the distribution.
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// Based on LayoutTests/fast/js/Object-keys.html

assertEquals(Object.keys(2), []);
assertEquals(Object.keys("foo"), ["0", "1", "2"]);
assertThrows(function () { Object.keys(null) }, TypeError);
assertThrows(function () { Object.keys(undefined) }, TypeError);

assertEquals(Object.keys({}), []);
assertEquals(Object.keys({a:null}), ['a']);
assertEquals(Object.keys({a:null, b:null}), ['a', 'b']);
assertEquals(Object.keys({b:null, a:null}), ['b', 'a']);
assertEquals(Object.keys([]), []);
assertEquals(Object.keys([null]), ['0']);
assertEquals(Object.keys([undefined]), ['0']);
assertEquals(Object.keys([null,null]), ['0', '1']);
assertEquals(Object.keys([null,null,,,,null]), ['0', '1', '5']);
assertEquals(Object.keys({__proto__:{a:null}}), []);
assertEquals(Object.keys({__proto__:[1,2,3]}), []);
var x = [];
x.__proto__ = [1, 2, 3];
assertEquals(Object.keys(x), []);
assertEquals(Object.keys(function () {}), []);

assertEquals('string', typeof(Object.keys([1])[0]));

function argsTest(a, b, c) {
  assertEquals(['0', '1', '2'], Object.keys(arguments));
}

argsTest(1, 2, 3);

var literal = {a: 1, b: 2, c: 3};
var keysBefore = Object.keys(literal);
assertEquals(['a', 'b', 'c'], keysBefore);
keysBefore[0] = 'x';
var keysAfter = Object.keys(literal);
assertEquals(['a', 'b', 'c'], keysAfter);
assertEquals(['x', 'b', 'c'], keysBefore);


var o = [1, 2, 3];
assertEquals(['0', '1', '2'], Object.keys(o));
Object.defineProperty(o, '0', {
    enumerable: false,
});
assertEquals(['1', '2'], Object.keys(o));


(function(){
  assertEquals(['0', '1', '2'], Object.keys(arguments));
  Object.defineProperty(arguments, '0', {
      enumerable: false,
  });
  assertEquals(['1', '2'], Object.keys(arguments));
})(0,1,2);


(function(a, b){
  assertEquals(['0', '1', '2'], Object.keys(arguments));
  Object.defineProperty(arguments, '0', {
      enumerable: false,
  });
  assertEquals(['1', '2'], Object.keys(arguments));
})(0,1,2);

var b = [];
assertEquals(0, Object.keys(b).length);
b[0] = undefined;
assertEquals(1, Object.keys(b).length);