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diff --git a/test/suite/intl402/ch09/9.2/9.2.6_4_b.js b/test/suite/intl402/ch09/9.2/9.2.6_4_b.js
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+++ b/test/suite/intl402/ch09/9.2/9.2.6_4_b.js
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+// Copyright 2012 Mozilla Corporation. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/**
+ * @description Tests that Unicode locale extension sequences do not affect
+ *    whether a locale is considered supported, but are reported back.
+ * @author Norbert Lindenberg
+ */
+
+$INCLUDE("testIntl.js");
+
+testWithIntlConstructors(function (Constructor) {
+    // this test should work equally for both matching algorithms
+    ["lookup", "best fit"].forEach(function (matcher) {
+        var info = getLocaleSupportInfo(Constructor);
+        var allLocales = info.supported.concat(info.byFallback, info.unsupported);
+        allLocales.forEach(function (locale) {
+            var validExtension = "-u-co-phonebk-nu-latn";
+            var invalidExtension = "-u-nu-invalid";
+            var supported1 = Constructor.supportedLocalesOf([locale],
+                {localeMatcher: matcher});
+            var supported2 = Constructor.supportedLocalesOf([locale + validExtension],
+                {localeMatcher: matcher});
+            var supported3 = Constructor.supportedLocalesOf([locale + invalidExtension],
+                {localeMatcher: matcher});
+            if (supported1.length === 1) {
+                if (supported2.length !== 1 || supported3.length !== 1) {
+                    $ERROR("Presence of Unicode locale extension sequence affects whether locale " +
+                        locale + " is considered supported with matcher " + matcher + ".");
+                }
+                if (supported2[0] !== locale + validExtension || supported3[0] !== locale + invalidExtension) {
+                    alert(locale + "; " + supported2[0] + "; " + supported3[0]);
+                    $ERROR("Unicode locale extension sequence is not correctly returned for locale " +
+                        locale + " with matcher " + matcher + ".");
+                }
+            } else {
+                if (supported2.length !== 0 || supported3.length !== 0) {
+                    $ERROR("Presence of Unicode locale extension sequence affects whether locale " +
+                        locale + " is considered supported with matcher " + matcher + ".");
+                }
+            }
+        });
+    });
+
+    return true;
+});
+