v8/test/intl/date-format/property-override.js

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// Checks for security holes introduced by Object.property overrides.
// For example:
// Object.defineProperty(Array.prototype, 'locale', {
//   set: function(value) {
//     throw new Error('blah');
//   },
//   configurable: true,
//   enumerable: false
// });
//
// would throw in case of (JS) x.locale = 'us' or (C++) x->Set('locale', 'us').
//
// Update both date-format.js and date-format.cc so they have the same list of
// properties.

// First get supported properties.
// Some of the properties are optional, so we request them.
var properties = [];
var options = Intl.DateTimeFormat(
  'en-US', {weekday: 'short', era: 'short', year: 'numeric', month: 'short',
            day: 'numeric', hour: 'numeric', minute: 'numeric',
            second: 'numeric', timeZoneName: 'short'}).resolvedOptions();
for (var prop in options) {
  if (options.hasOwnProperty(prop)) {
    properties.push(prop);
  }
}

// In the order of Table 6 of
// ecma402 #sec-intl.datetimeformat.prototype.resolvedoptions
var expectedProperties = [
  'locale',
  'calendar',
  'numberingSystem',
  'timeZone',
  'hourCycle',
  'hour12',
  'weekday',
  'era',
  'year',
  'month',
  'day',
  'hour',
  'minute',
  'second',
  'timeZoneName',
];

assertEquals(expectedProperties.length, properties.length);

properties.forEach(function(prop) {
  assertFalse(expectedProperties.indexOf(prop) === -1);
});

taintProperties(properties);

var locale = Intl.DateTimeFormat().resolvedOptions().locale;