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diff --git a/test/suite/intl402/ch12/12.2/12.2.3_b.js b/test/suite/intl402/ch12/12.2/12.2.3_b.js
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+// Copyright 2012 Mozilla Corporation. All rights reserved.
+// This code is governed by the license found in the LICENSE file.
+
+/**
+ * @description Tests that Intl.DateTimeFormat does not accept Unicode locale
+ *     extension keys and values that are not allowed.
+ * @author Norbert Lindenberg
+ */
+
+$INCLUDE("testIntl.js");
+
+var locales = ["ja-JP", "zh-Hans-CN", "zh-Hant-TW"];
+var input = new Date(Date.parse("1989-11-09T17:57:00Z"));
+
+locales.forEach(function (locale) {
+    var defaultDateTimeFormat = new Intl.DateTimeFormat([locale]);
+    var defaultOptions = defaultDateTimeFormat.resolvedOptions();
+    var defaultOptionsJSON = JSON.stringify(defaultOptions);
+    var defaultLocale = defaultOptions.locale;
+    var defaultFormatted = defaultDateTimeFormat.format(input);
+
+    var keyValues = {
+        "cu": ["USD", "EUR", "JPY", "CNY", "TWD", "invalid"], // DateTimeFormat internally uses NumberFormat
+        "nu": ["native", "traditio", "finance", "invalid"],
+        "tz": ["usnavajo", "utcw01", "aumel", "uslax", "usnyc", "deber", "invalid"]
+    };
+    
+    Object.getOwnPropertyNames(keyValues).forEach(function (key) {
+        keyValues[key].forEach(function (value) {
+            var dateTimeFormat = new Intl.DateTimeFormat([locale + "-u-" + key + "-" + value]);
+            var options = dateTimeFormat.resolvedOptions();
+            if (options.locale !== defaultLocale) {
+                $ERROR("Locale " + options.locale + " is affected by key " +
+                key + "; value " + value + ".");
+            }
+            if (JSON.stringify(options) !== defaultOptionsJSON) {
+                $ERROR("Resolved options " + JSON.stringify(options) + " are affected by key " +
+                key + "; value " + value + ".");
+            }
+            if (defaultFormatted !== dateTimeFormat.format(input)) {
+                $ERROR("Formatted value " + dateTimeFormat.format(input) + " is affected by key " +
+                key + "; value " + value + ".");
+            }
+        });
+    });
+});
+