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diff --git a/js/src/tests/test262/intl402/Intl/getCanonicalLocales/unicode-ext-canonicalize-measurement-system.js b/js/src/tests/test262/intl402/Intl/getCanonicalLocales/unicode-ext-canonicalize-measurement-system.js
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+++ b/js/src/tests/test262/intl402/Intl/getCanonicalLocales/unicode-ext-canonicalize-measurement-system.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 "ms" 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="ms" [...] alias="measure" since="28">
+const testData = {
+  // <type name="uksystem" [...] alias="imperial" since="28" />
+  "imperial": "uksystem",
+};
+
+for (let [alias, name] of Object.entries(testData)) {
+  let tag = "und-u-ms-" + alias;
+  let canonical = "und-u-ms-" + 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);