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diff --git a/js/src/tests/test262/intl402/Intl/getCanonicalLocales/unicode-ext-canonicalize-yes-to-true.js b/js/src/tests/test262/intl402/Intl/getCanonicalLocales/unicode-ext-canonicalize-yes-to-true.js
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+++ b/js/src/tests/test262/intl402/Intl/getCanonicalLocales/unicode-ext-canonicalize-yes-to-true.js
@@ -0,0 +1,88 @@
+// 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: >
+  "kb", "kc", "kh", "kk", and "kn" Unicode extension keys canonicalise "yes" to "true".
+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.
+
+  UTS 35, §3.2.1 Canonical Unicode Locale Identifiers
+    Any type or tfield value "true" is removed.
+includes: [testIntl.js]
+---*/
+
+const unicodeKeys = [
+  // <key name="kb" [...] alias="colBackwards">
+  //   <type name="true" [...] alias="yes"/>
+  "kb",
+
+  // <key name="kc" [...] alias="colCaseLevel">
+  //   <type name="true" [...] alias="yes"/>
+  "kc",
+
+  // <key name="kh" [...] alias="colBackwards">
+  //   <type name="true" [...] alias="yes"/>
+  "kh",
+
+  // <key name="kh" [...] alias="colHiraganaQuaternary">
+  //   <type name="true" [...] alias="yes"/>
+  "kk",
+
+  // <key name="kn" [...] alias="colNumeric">
+  //   <type name="true" [...] alias="yes"/>
+  "kn",
+];
+
+for (let key of unicodeKeys) {
+  let tag = `und-u-${key}-yes`;
+  let canonical = `und-u-${key}`;
+
+  // 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);
+}
+
+// Test some other Unicode extension keys which don't contain an alias entry to
+// canonicalise "yes" to "true".
+const otherUnicodeKeys = [
+  "ka", "kf", "kr", "ks", "kv",
+];
+
+for (let key of otherUnicodeKeys) {
+  let tag = `und-u-${key}-yes`;
+
+  // Make sure the test data is correct.
+  assert(isCanonicalizedStructurallyValidLanguageTag(tag),
+         "\"" + tag + "\" is a canonical and structurally valid language tag.");
+
+  let result = Intl.getCanonicalLocales(tag);
+  assert.sameValue(result.length, 1);
+  assert.sameValue(result[0], tag);
+}
+
+reportCompare(0, 0);