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diff --git a/js/src/tests/test262/intl402/Intl/getCanonicalLocales/unicode-ext-canonicalize-region.js b/js/src/tests/test262/intl402/Intl/getCanonicalLocales/unicode-ext-canonicalize-region.js
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+++ b/js/src/tests/test262/intl402/Intl/getCanonicalLocales/unicode-ext-canonicalize-region.js
@@ -0,0 +1,69 @@
+// 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 "rg" 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.
+
+    Replace aliases in special key values:
+      If there is an 'sd' or 'rg' key, replace any subdivision alias in its value in the same way,
+      using subdivisionAlias data.
+includes: [testIntl.js]
+---*/
+
+const testData = {
+  // <subdivisionAlias type="no23" replacement="no50" reason="deprecated"/>
+  "no23": "no50",
+
+  // <subdivisionAlias type="cn11" replacement="cnbj" reason="deprecated"/>
+  "cn11": "cnbj",
+
+  // <subdivisionAlias type="cz10a" replacement="cz110" reason="deprecated"/>
+  "cz10a": "cz110",
+
+  // <subdivisionAlias type="fra" replacement="frges" reason="deprecated"/>
+  "fra": "frges",
+
+  // <subdivisionAlias type="frg" replacement="frges" reason="deprecated"/>
+  "frg": "frges",
+
+  // <subdivisionAlias type="lud" replacement="lucl ludi lurd luvd luwi" reason="deprecated"/>
+  "lud": "lucl",
+};
+
+for (let [alias, name] of Object.entries(testData)) {
+  let tag = "und-u-rg-" + alias;
+  let canonical = "und-u-rg-" + 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);