--- /dev/null	2017-06-17 22:58:47.330661897 -0700
+++ new/test/jdk/java/net/URLDecoder/EncodingTest.java	2017-12-11 11:59:56.734653377 -0800
@@ -0,0 +1,122 @@
+/*
+ * 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.
+ */
+
+import java.net.URLDecoder;
+import java.net.URLEncoder;
+import java.nio.charset.StandardCharsets;
+import org.testng.Assert;
+import org.testng.annotations.DataProvider;
+import org.testng.annotations.Test;
+
+/**
+ * @test
+ * @bug 8183743
+ * @summary Test to verify the new overload method with Charset functions the
+ * same as the existing method that takes a charset name.
+ * @run testng EncodingTest
+ */
+public class EncodingTest {
+    public static enum ParameterType {
+        STRING,
+        CHARSET
+    }
+
+    @DataProvider(name = "illegalArgument")
+    public Object[][] getParameters() {
+        return new Object[][]{
+            {ParameterType.STRING},
+            {ParameterType.CHARSET}
+        };
+    }
+
+    @DataProvider(name = "decode")
+    public Object[][] getDecodeParameters() {
+        return new Object[][]{
+            {"The string \u00FC@foo-bar"},
+            // the string from javadoc example
+
+            {""}, // an empty string
+
+            {"x"}, // a string of length 1
+
+            {"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_-.*"},
+            // the string of characters should remain the same
+
+            {charactersRange('\u0000', '\u007F')},
+            // a string of characters from 0 to 127
+
+            {charactersRange('\u0080', '\u00FF')},
+            // a string of characters from 128 to 255
+
+            {"\u0100 \u0101 \u0555 \u07FD \u07FF"},
+            // a string of Unicode values can be expressed as 2 bytes
+
+            {"\u8000 \u8001 \uA000 \uFFFD \uFFFF"}, // a string of Unicode values can be expressed as 3 bytes
+        };
+    }
+
+    /**
+     * Verifies that IAE is thrown when decoding an invalid string using the
+     * existing method or the new overload method.
+     *
+     * @param type the type of the argument, e.g a String charset name or
+     * charset
+     */
+    @Test(dataProvider = "illegalArgument", expectedExceptions = IllegalArgumentException.class)
+    public void testIllegalArgument(ParameterType type) throws Exception {
+        String encoded = URLEncoder.encode("http://www.xyz.com/find?key=\u0100\u0101",
+                StandardCharsets.UTF_8.name());
+        String illegal = "%" + encoded;
+        String returned;
+        if (type == ParameterType.STRING) {
+            returned = URLDecoder.decode(illegal, StandardCharsets.UTF_8.name());
+        } else {
+            returned = URLDecoder.decode(illegal, StandardCharsets.UTF_8);
+        }
+    }
+
+    /**
+     * Verifies that the returned values of decoding with the existing
+     * and the overload methods match.
+     *
+     * @param s the string to be encoded and then decoded with both existing
+     * and the overload methods.
+     * @throws Exception
+     */
+    @Test(dataProvider = "decode")
+    public void decode(String s) throws Exception {
+        String encoded = URLEncoder.encode(s, StandardCharsets.UTF_8.name());
+        String returned1 = URLDecoder.decode(encoded, StandardCharsets.UTF_8.name());
+        String returned2 = URLDecoder.decode(encoded, StandardCharsets.UTF_8);
+        Assert.assertEquals(returned1, returned2);
+    }
+
+    String charactersRange(char c1, char c2) {
+        StringBuilder sb = new StringBuilder(c2 - c1);
+        for (char c = c1; c < c2; c++) {
+            sb.append(c);
+        }
+
+        return sb.toString();
+    }
+}