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diff --git a/test/suite/intl402/ch06/6.2/6.2.2_b.js b/test/suite/intl402/ch06/6.2/6.2.2_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 language tags with "_" are not accepted.
+ * @author Norbert Lindenberg
+ */
+
+$INCLUDE("testIntl.js");
+
+var invalidLanguageTags = [
+    "de_DE",
+    "DE_de",
+    "cmn_Hans",
+    "cmn-hans_cn",
+    "es_419",
+    "es-419-u-nu-latn-cu_bob",
+    "i_klingon",
+    "cmn-hans-cn-t-ca-u-ca-x_t-u",
+    "enochian_enochian",
+    "de-gregory_u-ca-gregory"
+];
+
+testWithIntlConstructors(function (Constructor) {
+    invalidLanguageTags.forEach(function (tag) {
+        var error;
+        try {
+            // this must throw an exception for an invalid language tag
+            var obj = new Constructor([tag]);
+        } catch (e) {
+            error = e;
+        }
+        if (error === undefined) {
+            $ERROR("Invalid language tag " + tag + " was not rejected.");
+        } else if (error.name !== "RangeError") {
+            $ERROR("Invalid language tag " + tag + " was rejected with wrong error " + error.name + ".");
+        }
+    });
+    return true;
+});
+