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diff --git a/js/src/tests/test262/intl402/Intl/getCanonicalLocales/canonicalized-unicode-ext-seq.js b/js/src/tests/test262/intl402/Intl/getCanonicalLocales/canonicalized-unicode-ext-seq.js
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+++ b/js/src/tests/test262/intl402/Intl/getCanonicalLocales/canonicalized-unicode-ext-seq.js
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+// Copyright (C) 2017 André Bargull. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-intl.getcanonicallocales
+description: >
+  Implementations are allowed to canonicalize extension subtag sequences.
+info: |
+  8.2.1 Intl.getCanonicalLocales (locales)
+    1. Let ll be ? CanonicalizeLocaleList(locales).
+    2. Return CreateArrayFromList(ll).
+
+  9.2.1 CanonicalizeLocaleList (locales)
+    ...
+    7. Repeat, while k < len
+      ...
+      c. If kPresent is true, then
+        ...
+        v. Let canonicalizedTag be CanonicalizeLanguageTag(tag).
+        ...
+
+  6.2.3 CanonicalizeLanguageTag (locale)
+    The specifications for extensions to BCP 47 language tags, such as
+    RFC 6067, may include canonicalization rules for the extension subtag
+    sequences they define that go beyond the canonicalization rules of
+    RFC 5646 section 4.5. Implementations are allowed, but not required,
+    to apply these additional rules.
+---*/
+
+var locale = "it-u-nu-latn-ca-gregory";
+
+// RFC 6067: The canonical order of keywords is in US-ASCII order by key.
+var sorted = "it-u-ca-gregory-nu-latn";
+
+var canonicalLocales = Intl.getCanonicalLocales(locale);
+assert.sameValue(canonicalLocales.length, 1);
+
+var canonicalLocale = canonicalLocales[0];
+assert((canonicalLocale === locale) || (canonicalLocale === sorted));
+
+reportCompare(0, 0);