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diff --git a/js/src/tests/test262/intl402/Intl/getCanonicalLocales/unicode-ext-canonicalize-timezone.js b/js/src/tests/test262/intl402/Intl/getCanonicalLocales/unicode-ext-canonicalize-timezone.js
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+++ b/js/src/tests/test262/intl402/Intl/getCanonicalLocales/unicode-ext-canonicalize-timezone.js
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+// Copyright (C) 2020 André Bargull. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-intl.getcanonicallocales
+description: >
+  Test Unicode extension subtag canonicalisation for the "tz" extension key.
+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. If IsStructurallyValidLanguageTag(tag) is false, throw a RangeError exception.
+        vi. Let canonicalizedTag be CanonicalizeUnicodeLocaleId(tag).
+        ...
+
+  UTS 35, §3.2.1 Canonical Unicode Locale Identifiers
+    Use the bcp47 data to replace keys, types, tfields, and tvalues by their canonical forms.
+    See Section 3.6.4 U Extension Data Files) and Section 3.7.1 T Extension Data Files. The
+    aliases are in the alias attribute value, while the canonical is in the name attribute value.
+includes: [testIntl.js]
+---*/
+
+// <key name="tz" [...] alias="timezone">
+const testData = {
+  // Similar to the "ca" extension key, assume "preferred" holds the canonical
+  // value and "name" the alias value.
+
+  // <type name="cnckg" [...] deprecated="true" preferred="cnsha"/>
+  "cnckg": "cnsha",
+
+  // NB: "Eire" matches the |uvalue| production.
+  // <type name="iedub" [...] alias="Europe/Dublin Eire"/>
+  "eire": "iedub",
+
+  // NB: "EST" matches the |uvalue| production.
+  // <type name="utcw05" [...] alias="Etc/GMT+5 EST"/>
+  "est": "utcw05",
+
+  // NB: "GMT0" matches the |uvalue| production.
+  // <type name="gmt" [...] alias="Etc/GMT Etc/GMT+0 Etc/GMT-0 Etc/GMT0 Etc/Greenwich GMT GMT+0 GMT-0 GMT0 Greenwich"/>
+  "gmt0": "gmt",
+
+  // NB: "UCT" matches the |uvalue| production.
+  // <type name="utc" [...] alias="Etc/UTC Etc/UCT Etc/Universal Etc/Zulu UCT UTC Universal Zulu"/>
+  "uct": "utc",
+
+  // NB: "Zulu" matches the |uvalue| production.
+  // <type name="utc" [...] alias="Etc/UTC Etc/UCT Etc/Universal Etc/Zulu UCT UTC Universal Zulu"/>
+  "zulu": "utc",
+};
+
+for (let [alias, name] of Object.entries(testData)) {
+  let tag = "und-u-tz-" + alias;
+  let canonical = "und-u-tz-" + name;
+
+  // Make sure the test data is correct.
+  assert.sameValue(isCanonicalizedStructurallyValidLanguageTag(tag), false,
+                   "\"" + tag + "\" isn't a canonical language tag.");
+  assert(isCanonicalizedStructurallyValidLanguageTag(canonical),
+         "\"" + canonical + "\" is a canonical and structurally valid language tag.");
+
+  let result = Intl.getCanonicalLocales(tag);
+  assert.sameValue(result.length, 1);
+  assert.sameValue(result[0], canonical);
+}
+
+reportCompare(0, 0);