--- /dev/null	2019-05-22 18:58:30.000000000 -0700
+++ new/test/jdk/java/text/Normalizer/SquareEraCharacterTest.java	2019-05-22 18:58:30.000000000 -0700
@@ -0,0 +1,62 @@
+/*
+ * Copyright (c) 2019, 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 8221431
+ * @summary Tests decomposition of Japanese square era characters.
+ * @run testng/othervm SquareEraCharacterTest
+ */
+
+import static org.testng.Assert.assertEquals;
+
+import java.text.Normalizer;
+
+import org.testng.annotations.DataProvider;
+import org.testng.annotations.Test;
+
+@Test
+public class SquareEraCharacterTest {
+
+    @DataProvider
+    Object[][] squareEras() {
+        return new Object[][] {
+
+            // square era character, expected decomposed string
+            {'\u337e',  "\u660e\u6cbb"},    // Meizi
+            {'\u337d',  "\u5927\u6b63"},    // Taisho
+            {'\u337c',  "\u662d\u548c"},    // Showa 
+            {'\u337b',  "\u5e73\u6210"},    // Heisei
+            {'\u32ff',  "\u4ee4\u548c"},    // Reiwa
+        };
+    }
+
+    @Test(dataProvider="squareEras")
+    public void test_normalize(char squareChar, String expected) {
+
+        assertEquals(
+            Normalizer.normalize(Character.toString(squareChar), Normalizer.Form.NFKD),
+            expected,
+            "decomposing " + Character.getName(squareChar) + ".");
+    }
+}