Function assertLanguageTag

deps/v8/test/intl/assert.js:284–294

* Throw if |parent| is not a more general language tag of |child|, nor |child| * itself, per BCP 47 rules.

(child, parent)

 * itself, per BCP 47 rules.
 */
function assertLanguageTag(child, parent) {
  var childSplit = splitLanguageTag(child);
  var parentSplit = splitLanguageTag(parent);

  // Do not compare extensions at this moment, as %GetDefaultICULocale()
  // doesn't always output something we support.
  if (childSplit.locale !== parentSplit.locale &&
      !childSplit.locale.startsWith(parentSplit.locale + '-')) {
    fail(child, parent, 'language tag comparison');
  }
}

function assertArrayEquals(expected, found, name_opt) {
  var start = "";