1 files changed, 26 insertions, 0 deletions
diff --git a/js/src/tests/non262/Intl/available-locales-supported.js b/js/src/tests/non262/Intl/available-locales-supported.js
new file mode 100644
index 0000000000..d11b5d714f
--- /dev/null
+++ b/js/src/tests/non262/Intl/available-locales-supported.js
@@ -0,0 +1,26 @@
+// |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);
+
+  // All available locales must be reported as supported.
+  let supported = intlConstructor.supportedLocalesOf(available);
+  assertEqArray(supported, available);
+}
+
+if (typeof reportCompare === "function")
+  reportCompare(true, true);