v8/test/mjsunit/regress/regress-619.js

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// Tests that Object.defineProperty works correctly on array indices. 
// Please see http://code.google.com/p/v8/issues/detail?id=619 for details.

var obj = {};
obj[1] = 42;
assertEquals(42, obj[1]);
Object.defineProperty(obj, '1', {value:10, writable:false});
assertEquals(10, obj[1]);

// We should not be able to override obj[1].
obj[1] = 5;
assertEquals(10, obj[1]);

// Try on a range of numbers.
for(var i = 0; i < 1024; i++) {
  obj[i] = 42;
}

for(var i = 0; i < 1024; i++) {
  Object.defineProperty(obj, i, {value: i, writable:false});
}

for(var i = 0; i < 1024; i++) {
  assertEquals(i, obj[i]);
}

for(var i = 0; i < 1024; i++) {
  obj[1] = 5;
}

for(var i = 0; i < 1024; i++) {
  assertEquals(i, obj[i]);
}