src/third_party/web_platform_tests/js/builtins/Array.DefineOwnProperty.html

<!doctype html>
<title>Array.[[DefineOwnProperty]]</title>
<link rel=author href=mailto:Ms2ger@gmail.com title=Ms2ger>
<link rel=help href=http://es5.github.com/#x15.4.5.1>
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<div id=log></div>
<script>
test(function() {
  var arr = new Array;
  assert_equals(arr.length, 0);

  var called = 0;
  Object.defineProperty(arr, 0, { get: function() { ++called; return 7 } });
  assert_equals(arr.length, 1);
  assert_equals(called, 0);

  assert_equals(arr[0], 7);
  assert_equals(called, 1);

  assert_equals(String(arr), "7");
  assert_equals(called, 2);
});
</script>