test/intl/number-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 number-format.js and number-format.cc so they have the same
// list of properties.

// First get supported properties.
var properties = [];
// Some properties are optional and won't show up in resolvedOptions if
// they were not requested - currency, currencyDisplay,
// minimumSignificantDigits and maximumSignificantDigits - so we request them.
var options = Intl.NumberFormat(
  undefined, {style: 'currency', currency: 'USD', currencyDisplay: 'name',
              minimumSignificantDigits: 1, maximumSignificantDigits: 5}).
    resolvedOptions();
for (var prop in options) {
  if (options.hasOwnProperty(prop)) {
    properties.push(prop);
  }
}

var expectedProperties = [
  'style', 'locale', 'numberingSystem',
  'currency', 'currencyDisplay', 'useGrouping',
  'minimumIntegerDigits', 'minimumFractionDigits',
  'maximumFractionDigits', 'minimumSignificantDigits',
  'maximumSignificantDigits'
];

assertEquals(expectedProperties.length, properties.length);

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

taintProperties(properties);

var locale = Intl.NumberFormat(undefined,
                               {currency: 'USD', currencyDisplay: 'name',
                                minimumIntegerDigits: 2,
                                numberingSystem: 'latn'}).
    resolvedOptions().locale;