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-rw-r--r--js/src/tests/non262/Intl/RelativeTimeFormat/locale-fallback-handling.js15
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diff --git a/js/src/tests/non262/Intl/RelativeTimeFormat/locale-fallback-handling.js b/js/src/tests/non262/Intl/RelativeTimeFormat/locale-fallback-handling.js
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+++ b/js/src/tests/non262/Intl/RelativeTimeFormat/locale-fallback-handling.js
@@ -0,0 +1,15 @@
+// |reftest| skip-if(!this.hasOwnProperty("Intl"))
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+// In locales that don't have a relative-date/time formatter -- and presently
+// "ak" is such a locale -- behavior is expected to fall back to the root-locale
+// formatter. This test verifies such fallback works as long as "ak" satisfies
+// these properties; "ak" may safely be changed to a different locale if that
+// ever changes. See bug 1504656.
+assertEq(new Intl.RelativeTimeFormat("ak").format(1, "second"),
+ "+1 s");
+
+if (typeof reportCompare === "function")
+ reportCompare(0, 0, 'ok');