--- /dev/null	2017-07-31 00:10:02.668086338 -0700
+++ new/test/jdk/java/util/Locale/bcp47u/SystemPropertyTests.java	2017-11-10 15:31:01.082128554 -0800
@@ -0,0 +1,99 @@
+/*
+ * Copyright (c) 2017, 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
+ * @library /lib/testlibrary
+ * @bug 8189134
+ * @summary Tests the system properties
+ * @modules jdk.localedata
+ * @build DefaultLocaleTest jdk.testlibrary.*
+ * @run testng/othervm SystemPropertyTests
+ */
+
+import static jdk.testlibrary.ProcessTools.executeTestJava;
+import static org.testng.Assert.assertTrue;
+
+import java.util.Locale;
+
+import org.testng.annotations.DataProvider;
+import org.testng.annotations.Test;
+
+/**
+ * Test Locale.getDefault() reflects the system property. Note that the
+ * result may change depending on the CLDR releases.
+ */
+@Test
+public class SystemPropertyTests {
+
+    private static String LANGPROP = "-Duser.language=en";
+    private static String CTRYPROP = "-Duser.country=US";
+
+    @DataProvider(name="data")
+    Object[][] data() {
+        return new Object[][] {
+            // system property, expected default, expected format, expected display
+            {"-Duser.extensions=u-ca-japanese",
+             "en_US_#u-ca-japanese",
+             "en_US_#u-ca-japanese",
+             "en_US_#u-ca-japanese",
+            },
+
+            {"-Duser.extensions=u-ca-japanese-nu-thai",
+             "en_US_#u-ca-japanese-nu-thai",
+             "en_US_#u-ca-japanese-nu-thai",
+             "en_US_#u-ca-japanese-nu-thai",
+            },
+    
+            {"-Duser.extensions=foo",
+             "en_US",
+             "en_US",
+             "en_US",
+            },
+            
+            {"-Duser.extensions.format=u-ca-japanese",
+             "en_US",
+             "en_US_#u-ca-japanese",
+             "en_US",
+            },
+            
+            {"-Duser.extensions.display=u-ca-japanese",
+             "en_US",
+             "en_US",
+             "en_US_#u-ca-japanese",
+            },
+        };
+    }
+
+    @Test(dataProvider="data")
+    public void runTest(String extprop, String defLoc,
+                        String defFmtLoc, String defDspLoc) throws Exception {
+        int exitValue = executeTestJava(LANGPROP, CTRYPROP,
+                                    extprop, "DefaultLocaleTest", defLoc, defFmtLoc, defDspLoc)
+                            .outputTo(System.out)
+                            .errorTo(System.out)
+                            .getExitValue();
+
+        assertTrue(exitValue == 0);
+    }
+}