1 files changed, 22 insertions, 0 deletions
diff --git a/js/src/tests/non262/Intl/RelativeTimeFormat/numbering-system.js b/js/src/tests/non262/Intl/RelativeTimeFormat/numbering-system.js
new file mode 100644
index 0000000000..d9a860bb01
--- /dev/null
+++ b/js/src/tests/non262/Intl/RelativeTimeFormat/numbering-system.js
@@ -0,0 +1,22 @@
+// |reftest| skip-if(!this.hasOwnProperty("Intl"))
+
+// Ensure passing the default numbering system leads to the same result as when
+// no explicit numbering system is present.
+//
+// This is a regression test for the ICU issue reported at
+// <https://unicode-org.atlassian.net/browse/ICU-20280>.
+
+for (var requestedLocale of [undefined, "en", "de", "fr"]) {
+  var rtf = new Intl.RelativeTimeFormat(requestedLocale);
+  var {locale, numberingSystem} = rtf.resolvedOptions();
+  var rtfNu = new Intl.RelativeTimeFormat(`${locale}-u-nu-${numberingSystem}`);
+
+  for (var unit of ["year", "quarter", "month", "week", "day", "hour", "minute", "second"]) {
+    for (var value of [-10, -3, -2, -1, 0, 1, 2, 3, 10]) {
+      assertEq(rtfNu.format(value, unit), rtf.format(value, unit));
+    }
+  }
+}
+
+if (typeof reportCompare === "function")
+  reportCompare(0, 0);