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diff --git a/js/src/tests/test262/intl402/RelativeTimeFormat/constructor/supportedLocalesOf/options-undefined.js b/js/src/tests/test262/intl402/RelativeTimeFormat/constructor/supportedLocalesOf/options-undefined.js
new file mode 100644
index 0000000000..9a0832ec14
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+++ b/js/src/tests/test262/intl402/RelativeTimeFormat/constructor/supportedLocalesOf/options-undefined.js
@@ -0,0 +1,28 @@
+// Copyright 2018 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-Intl.RelativeTimeFormat.supportedLocalesOf
+description: Checks handling of an undefined options argument to the supportedLocalesOf function.
+info: |
+ SupportedLocales ( availableLocales, requestedLocales, options )
+
+ 1. If options is not undefined, then
+ b. Let matcher be ? GetOption(options, "localeMatcher", "string", «"lookup", "best fit"», "best fit").
+features: [Intl.RelativeTimeFormat]
+---*/
+
+assert.sameValue(typeof Intl.RelativeTimeFormat.supportedLocalesOf, "function",
+ "Should support Intl.RelativeTimeFormat.supportedLocalesOf.");
+
+Object.defineProperties(Object.prototype, {
+ "localeMatcher": {
+ get() { throw new Error("Should not call localeMatcher getter"); }
+ }
+});
+
+assert.sameValue(Array.isArray(Intl.RelativeTimeFormat.supportedLocalesOf()), true, "No arguments");
+assert.sameValue(Array.isArray(Intl.RelativeTimeFormat.supportedLocalesOf([])), true, "One argument");
+assert.sameValue(Array.isArray(Intl.RelativeTimeFormat.supportedLocalesOf([], undefined)), true, "Two arguments");
+
+reportCompare(0, 0);