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diff --git a/js/src/tests/Intl/Collator/compare.js b/js/src/tests/Intl/Collator/compare.js
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+++ b/js/src/tests/Intl/Collator/compare.js
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+// |reftest| skip-if(!this.hasOwnProperty("Intl"))
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+// Tests the compare function with a diverse set of locales and options.
+
+var input = [
+    "Argentina",
+    "Oerlikon",
+    "Offenbach",
+    "Sverige",
+    "Vaticano",
+    "Zimbabwe",
+    "la France",
+    "¡viva España!",
+    "Österreich",
+    "中国",
+    "日本",
+    "한국",
+];
+
+var collator, expected;
+
+function assertEqualArray(actual, expected, collator) {
+    var description = JSON.stringify(collator.resolvedOptions());
+    assertEq(actual.length, expected.length, "array length, " + description);
+    for (var i = 0; i < actual.length; i++) {
+        assertEq(actual[i], expected[i], "element " + i + ", " + description);
+    }
+}
+
+
+// Locale en-US; default options.
+collator = new Intl.Collator("en-US");
+expected = [
+    "¡viva España!",
+    "Argentina",
+    "la France",
+    "Oerlikon",
+    "Offenbach",
+    "Österreich",
+    "Sverige",
+    "Vaticano",
+    "Zimbabwe",
+    "한국",
+    "中国",
+    "日本",
+];
+assertEqualArray(input.sort(collator.compare), expected, collator);
+
+// Locale sv-SE; default options.
+// Swedish treats "Ö" as a separate character, which sorts after "Z".
+collator = new Intl.Collator("sv-SE");
+expected = [
+    "¡viva España!",
+    "Argentina",
+    "la France",
+    "Oerlikon",
+    "Offenbach",
+    "Sverige",
+    "Vaticano",
+    "Zimbabwe",
+    "Österreich",
+    "한국",
+    "中国",
+    "日本",
+];
+assertEqualArray(input.sort(collator.compare), expected, collator);
+
+// Locale sv-SE; ignore punctuation.
+collator = new Intl.Collator("sv-SE", {ignorePunctuation: true});
+expected = [
+    "Argentina",
+    "la France",
+    "Oerlikon",
+    "Offenbach",
+    "Sverige",
+    "Vaticano",
+    "¡viva España!",
+    "Zimbabwe",
+    "Österreich",
+    "한국",
+    "中国",
+    "日本",
+];
+assertEqualArray(input.sort(collator.compare), expected, collator);
+
+// Locale de-DE; default options.
+// In German standard sorting, umlauted characters are treated as variants
+// of their base characters: ä ≅ a, ö ≅ o, ü ≅ u.
+collator = new Intl.Collator("de-DE");
+expected = [
+    "¡viva España!",
+    "Argentina",
+    "la France",
+    "Oerlikon",
+    "Offenbach",
+    "Österreich",
+    "Sverige",
+    "Vaticano",
+    "Zimbabwe",
+    "한국",
+    "中国",
+    "日本",
+];
+assertEqualArray(input.sort(collator.compare), expected, collator);
+
+// Locale de-DE; phonebook sort order.
+// In German phonebook sorting, umlauted characters are expanded to two-vowel
+// sequences: ä → ae, ö → oe, ü → ue.
+collator = new Intl.Collator("de-DE-u-co-phonebk");
+expected = [
+    "¡viva España!",
+    "Argentina",
+    "la France",
+    "Oerlikon",
+    "Österreich",
+    "Offenbach",
+    "Sverige",
+    "Vaticano",
+    "Zimbabwe",
+    "한국",
+    "中国",
+    "日本",
+];
+assertEqualArray(input.sort(collator.compare), expected, collator);
+
+reportCompare(0, 0, 'ok');