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diff --git a/test/suite/intl402/ch09/9.1/9.1_b.js b/test/suite/intl402/ch09/9.1/9.1_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 appropriate fallback locales are provided for
+ *     supported locales.
+ * @author Norbert Lindenberg
+ */
+
+$INCLUDE("testIntl.js");
+
+testWithIntlConstructors(function (Constructor) {
+    var info = getLocaleSupportInfo(Constructor);
+    var fallback;
+    info.supported.forEach(function (locale) {
+        var pos = locale.lastIndexOf("-");
+        if (pos !== -1) {
+            fallback = locale.substring(0, pos);
+            if (info.supported.indexOf(fallback) === -1) {
+                $ERROR("Locale " + locale + " is supported, but fallback " + fallback + " isn't.");
+            }
+        }
+        var match = /([a-z]{2,3})(-[A-Z][a-z]{3})(-[A-Z]{2})/.exec(locale);
+        if (match !== null) {
+            fallback = match[1] + match[3];
+            if (info.supported.indexOf(fallback) === -1) {
+                $ERROR("Locale " + locale + " is supported, but fallback " + fallback + " isn't.");
+            }
+        }
+    });
+});
+