src/v8/test/intl/break-iterator/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 break-iterator.js and break-iterator.cc so they have the same
// list of properties.

// First get supported properties.
var properties = [];
var options = Intl.v8BreakIterator().resolvedOptions();
for (var prop in options) {
  if (options.hasOwnProperty(prop)) {
    properties.push(prop);
  }
}

var expectedProperties = [
  'type', 'locale'
];

assertEquals(expectedProperties.length, properties.length);

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

taintProperties(properties);

var locale = Intl.v8BreakIterator().resolvedOptions().locale;