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diff --git a/js/src/tests/test262/built-ins/String/prototype/localeCompare/15.5.4.9_CE.js b/js/src/tests/test262/built-ins/String/prototype/localeCompare/15.5.4.9_CE.js
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+// Copyright 2012 Norbert Lindenberg. All rights reserved.
+// Copyright 2012 Mozilla Corporation. All rights reserved.
+// Copyright 2013 Microsoft Corporation. All rights reserved.
+// Copyright (C) 2022 Richard Gibson. All rights reserved.
+// This code is governed by the license found in the LICENSE file.
+
+/*---
+description: >
+    String.prototype.localeCompare must return 0 when
+    comparing Strings that are considered canonically equivalent by
+    the Unicode Standard.
+esid: sec-string.prototype.localecompare
+info: |
+    String.prototype.localeCompare ( _that_ [ , _reserved1_ [ , _reserved2_ ] ] )
+
+    This function must treat Strings that are canonically equivalent
+    according to the Unicode standard as identical and must return `0`
+    when comparing Strings that are considered canonically equivalent.
+---*/
+
+// pairs with characters not in Unicode 3.0 are commented out
+var pairs = [
+  // example from Unicode 5.0, section 3.7, definition D70
+  ["o\u0308", "ö"],
+  // examples from Unicode 5.0, chapter 3.11
+  ["ä\u0323", "a\u0323\u0308"],
+  ["a\u0308\u0323", "a\u0323\u0308"],
+  ["ạ\u0308", "a\u0323\u0308"],
+  ["ä\u0306", "a\u0308\u0306"],
+  ["ă\u0308", "a\u0306\u0308"],
+  // example from Unicode 5.0, chapter 3.12
+  ["\u1111\u1171\u11B6", "퓛"],
+  // examples from UTS 10, Unicode Collation Algorithm
+  ["Å", "Å"],
+  ["Å", "A\u030A"],
+  ["x\u031B\u0323", "x\u0323\u031B"],
+  ["ự", "ụ\u031B"],
+  ["ự", "u\u031B\u0323"],
+  ["ự", "ư\u0323"],
+  ["ự", "u\u0323\u031B"],
+  // examples from UAX 15, Unicode Normalization Forms
+  ["Ç", "C\u0327"],
+  ["q\u0307\u0323", "q\u0323\u0307"],
+  ["가", "\u1100\u1161"],
+  ["Å", "A\u030A"],
+  ["Ω", "Ω"],
+  ["Å", "A\u030A"],
+  ["ô", "o\u0302"],
+  ["ṩ", "s\u0323\u0307"],
+  ["ḋ\u0323", "d\u0323\u0307"],
+  ["ḋ\u0323", "ḍ\u0307"],
+  ["q\u0307\u0323", "q\u0323\u0307"],
+  // examples involving supplementary characters from UCD NormalizationTest.txt
+  //  ["\uD834\uDD5E", "\uD834\uDD57\uD834\uDD65"],
+  //  ["\uD87E\uDC2B", "北"]
+];
+
+var i;
+for (i = 0; i < pairs.length; i++) {
+  var pair = pairs[i];
+  if (pair[0].localeCompare(pair[1]) !== 0) {
+    throw new Test262Error("String.prototype.localeCompare considers " + pair[0] + " (" + toU(pair[0]) +
+      ") ≠ " + pair[1] + " (" + toU(pair[1]) + ").");
+  }
+}
+
+function toU(s) {
+  var result = "";
+  var escape = "\\u0000";
+  var i;
+  for (i = 0; i < s.length; i++) {
+    var hex = s.charCodeAt(i).toString(16);
+    result += escape.substring(0, escape.length - hex.length) + hex;
+  }
+  return result;
+}
+
+reportCompare(0, 0);