--- /dev/null	Fri Aug 17 22:48:02 2012
+++ new/test/java/util/PluggableLocale/SupportedLocalesTest.java	Fri Aug 17 22:48:00 2012
@@ -0,0 +1,76 @@
+/*
+ * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ * @test
+ * @bug 7168528
+ * @summary Test the default implementation of LocaleServiceProvider.isSupportedLocale.
+ */
+
+import java.util.*;
+import java.util.spi.LocaleServiceProvider;
+
+public class SupportedLocalesTest {
+    private static final Locale[] GOOD_ONES = {
+        Locale.forLanguageTag("ja-JP-x-lvariant-JP"),
+        Locale.forLanguageTag("th-TH-x-lvariant-TH"),
+        Locale.US,
+    };
+    private static final Locale[] BAD_ONES = {
+        Locale.GERMAN,
+        Locale.GERMANY,
+        Locale.CANADA,
+        Locale.TAIWAN,
+    };
+
+    public static void main(String[] args) {
+        LocaleServiceProvider provider = new TestLocaleServiceProvider();
+        List<Locale> locs = new ArrayList<>();
+        locs.addAll(Arrays.asList(GOOD_ONES));
+        locs.addAll(Arrays.asList(provider.getAvailableLocales()));
+        for (Locale locale : locs) {
+            if (!provider.isSupportedLocale(locale)) {
+                throw new RuntimeException(locale + " is NOT supported.");
+            }
+        }
+
+        for (Locale locale : BAD_ONES) {
+            if (provider.isSupportedLocale(locale)) {
+                throw new RuntimeException(locale + " should NOT be supported.");
+            }
+        }
+    }
+
+    private static class TestLocaleServiceProvider extends LocaleServiceProvider {
+        private static final Locale[] locales = {
+            new Locale("ja", "JP", "JP"),
+            new Locale("th", "TH", "TH"),
+            Locale.forLanguageTag("en-US-u-ca-buddhist"),
+        };
+
+        @Override
+        public Locale[] getAvailableLocales() {
+            return locales.clone();
+        }
+    }
+}