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diff --git a/js/src/tests/non262/Intl/available-locales-implied-script.js b/js/src/tests/non262/Intl/available-locales-implied-script.js
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index 0000000000..d9abbebf49
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+++ b/js/src/tests/non262/Intl/available-locales-implied-script.js
@@ -0,0 +1,35 @@
+// |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);
+ let availableSet = new Set(available);
+
+ available.filter(x => {
+ return new Intl.Locale(x);
+ }).filter(loc => {
+ // Find all locales which have both a script and a region subtag.
+ return loc.script && loc.region;
+ }).forEach(loc => {
+ let noScript = `${loc.language}-${loc.region}`;
+
+ // The locale without a script subtag must also be available.
+ assertEq(availableSet.has(noScript), true, `Missing locale ${noScript} for ${loc}`);
+ });
+}
+
+if (typeof reportCompare === "function")
+ reportCompare(true, true);