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

// Copyright 2013 the V8 project authors. All rights reserved.
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//
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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);
  }
}

var expectedProperties = [
  'calendar', 'day', 'era', 'hour12', 'hour', 'locale',
  'minute', 'month', 'numberingSystem',
  'second', 'timeZone', 'timeZoneName', 'weekday', 'year'
];

assertEquals(expectedProperties.length, properties.length);

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

taintProperties(properties);

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