v8/test/mjsunit/regress/regress-1692.js

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// Test that Object.prototype.propertyIsEnumerable handles array indices
// correctly.

var p = Object.create({}, {
  a : { value : 42, enumerable : true },
  b : { value : 42, enumerable : false },
  1 : { value : 42, enumerable : true },
  2 : { value : 42, enumerable : false },
  f : { get: function(){}, enumerable: true },
  g : { get: function(){}, enumerable: false },
  11 : { get: function(){}, enumerable: true },
  12 : { get: function(){}, enumerable: false }
});
var o = Object.create(p, {
  c : { value : 42, enumerable : true },
  d : { value : 42, enumerable : false },
  3 : { value : 42, enumerable : true },
  4 : { value : 42, enumerable : false },
  h : { get: function(){}, enumerable: true },
  k : { get: function(){}, enumerable: false },
  13 : { get: function(){}, enumerable: true },
  14 : { get: function(){}, enumerable: false }
});

// Inherited properties are ignored.
assertFalse(o.propertyIsEnumerable("a"));
assertFalse(o.propertyIsEnumerable("b"));
assertFalse(o.propertyIsEnumerable("1"));
assertFalse(o.propertyIsEnumerable("2"));

// Own properties.
assertTrue(o.propertyIsEnumerable("c"));
assertFalse(o.propertyIsEnumerable("d"));
assertTrue(o.propertyIsEnumerable("3"));
assertFalse(o.propertyIsEnumerable("4"));

// Inherited accessors.
assertFalse(o.propertyIsEnumerable("f"));
assertFalse(o.propertyIsEnumerable("g"));
assertFalse(o.propertyIsEnumerable("11"));
assertFalse(o.propertyIsEnumerable("12"));

// Own accessors.
assertTrue(o.propertyIsEnumerable("h"));
assertFalse(o.propertyIsEnumerable("k"));
assertTrue(o.propertyIsEnumerable("13"));
assertFalse(o.propertyIsEnumerable("14"));

// Nonexisting properties.
assertFalse(o.propertyIsEnumerable("xxx"));
assertFalse(o.propertyIsEnumerable("999"));

// String object properties.
var o = Object("string");
// Non-string property on String object.
o[10] = 42;
assertTrue(o.propertyIsEnumerable(10));
assertTrue(o.propertyIsEnumerable(0));

// Fast elements.
var o = [1,2,3,4,5];
assertTrue(o.propertyIsEnumerable(3));