1 files changed, 41 insertions, 0 deletions
diff --git a/js/src/tests/non262/Intl/available-locales-resolved.js b/js/src/tests/non262/Intl/available-locales-resolved.js
new file mode 100644
index 0000000000..76b144d275
--- /dev/null
+++ b/js/src/tests/non262/Intl/available-locales-resolved.js
@@ -0,0 +1,41 @@
+// |reftest| skip-if(!this.hasOwnProperty('Intl'))
+
+if (typeof getAvailableLocalesOf === "undefined") {
+  var getAvailableLocalesOf = SpecialPowers.Cu.getJSTestingFunctions().getAvailableLocalesOf;
+}
+
+function IsIntlService(c) {
+  return typeof c === "function" &&
+         c.hasOwnProperty("prototype") &&
+         c.prototype.hasOwnProperty("resolvedOptions");
+}
+
+const intlConstructors = Object.getOwnPropertyNames(Intl).map(name => Intl[name]).filter(IsIntlService);
+
+// Test all Intl service constructors.
+for (let intlConstructor of intlConstructors) {
+  // Retrieve all available locales of the given Intl service constructor.
+  let available = getAvailableLocalesOf(intlConstructor.name);
+
+  // "best fit" matchers could potentially return a different locale, so we only
+  // test with "lookup" locale matchers. (NB: We don't yet support "best fit"
+  // matchers.)
+  let options = {localeMatcher: "lookup"};
+
+  if (intlConstructor === Intl.DisplayNames) {
+    // Intl.DisplayNames can't be constructed without the "type" option.
+    options.type = "language";
+  }
+
+  for (let locale of available) {
+    let obj = new intlConstructor(locale, options);
+    let resolved = obj.resolvedOptions();
+
+    // If |locale| is an available locale, the "lookup" locale matcher should
+    // pick exactly that locale.
+    assertEq(resolved.locale, locale);
+  }
+}
+
+if (typeof reportCompare === "function")
+  reportCompare(true, true);