--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/jdk/java/io/charStreams/StringConvert.java	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,150 @@
+/*
+ * Copyright (c) 1997, 2000, 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
+   @summary General tests of String constructors and methods that convert
+            between character encodings.  This should really be in
+            java/lang/String, but it shares code with the I/O charStream
+            tests.
+ */
+
+import java.io.*;
+
+
+public class StringConvert {
+
+    static String enc = "UTF8";
+    static int limit = 500;
+    static int max = 0xffff;
+
+    static void fail(String s) {
+        throw new RuntimeException(s);
+    }
+
+    public static void main(String[] args) throws Exception {
+        PrintStream log = System.err;
+        IntGenerator ig = new IntGenerator();
+        CharGenerator cg;
+        StringGenerator sg;
+        String s;
+        int i = 0;
+
+        /* String(byte[] bytes, String enc)
+           getBytes(String enc)
+         */
+        log.println("-- String(byte[], String), getBytes(String)");
+        i = 0;
+        cg = new CharGenerator(ig, 0, max);
+        sg = new StringGenerator(ig, cg, limit);
+        while ((s = sg.next()) != null) {
+            byte[] b = s.getBytes(enc);
+            String t = new String(b, enc);
+            if (!s.equals(t)) {
+                int n = Math.min(s.length(), t.length());
+                for (int j = 0; j < n; j++) {
+                    if (s.charAt(j) != t.charAt(j)) {
+                        log.println("Mismatch: " + j + " "
+                                    + Integer.toHexString(s.charAt(j))
+                                    + " != "
+                                    + Integer.toHexString(t.charAt(j)));
+                    }
+                }
+                fail("Conversion failure");
+            }
+            log.println("[" + i + "] " + s.length());
+            i++;
+        }
+
+        /* String(byte[] bytes)
+           getBytes()
+         */
+        log.println("-- String(byte[]), getBytes()");
+        i = 0;
+        cg = new CharGenerator(ig, 0x20, 0x7e);
+        sg = new StringGenerator(ig, cg, limit);
+        while ((s = sg.next()) != null) {
+            log.println("[" + i + "] \"" + s + "\"");
+            byte[] b = s.getBytes();
+            String t = new String(b);
+            if (! s.equals(t))
+                fail("Conversion failure");
+            i++;
+        }
+
+        /* String(byte[] bytes, int offset, int length)
+           getBytes()
+         */
+        log.println("-- String(byte[], int, int), getBytes()");
+        i = 0;
+        cg = new CharGenerator(ig, 0x20, 0x7e);
+        sg = new StringGenerator(ig, cg, limit);
+        while ((s = sg.next()) != null) {
+            log.println("[" + i + "] \"" + s + "\"");
+            byte[] b = s.getBytes();
+            int o = ig.next(s.length() - 1);
+            int n = ig.next(s.length() - o);
+            String t = new String(b, o, n);
+            if (! s.substring(o, o + n).equals(t))
+                fail("Conversion failure");
+            i++;
+        }
+
+        /* String(byte[] bytes, int offset, int length, String enc)
+           getBytes(String enc)
+         */
+        log.println("-- String(byte[], int, int, String), getBytes(String)");
+        i = 0;
+        cg = new CharGenerator(ig);
+        sg = new StringGenerator(ig, cg, limit);
+        while ((s = sg.next()) != null) {
+            log.println("[" + i + "] " + s.length());
+            byte[] b = s.getBytes(enc);
+            int o = ig.next(100);
+            byte[] b2 = new byte[b.length + o];
+            System.arraycopy(b, 0, b2, o, b.length);
+            String t = new String(b2, o, b.length, enc);
+            if (! s.equals(t))
+                fail("Conversion failure");
+            i++;
+        }
+
+        /* Substrings */
+        log.println("-- Substrings");
+        i = 0;
+        cg = new CharGenerator(ig, 0x20, 0x7e);
+        sg = new StringGenerator(ig, cg, limit);
+        while ((s = sg.next()) != null) {
+            log.println("[" + i + "] \"" + s + "\"");
+            int o = ig.next(s.length() - 1);
+            int n = ig.next(s.length() - o);
+            String s2 = s.substring(o, o + n);
+            byte[] b = s2.getBytes();
+            String t = new String(b);
+            if (! s2.equals(t))
+                fail("Conversion failure");
+            i++;
+        }
+
+    }
+
+}