test/jdk/java/lang/StringBuffer/CompactStringBuffer.java

rev 54260 : 8221430: StringBuffer(CharSequence) constructor truncates when -XX:-CompactStrings specified

@@ -1,7 +1,7 @@
 /*
- * Copyright (c) 2015, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2015, 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.

@@ -438,10 +438,16 @@
         ////////////////////////////////////////////////////////////////////
         check(new StringBuffer().append(ascii).append(1.23456).toString(),
               "abcdefgh1.23456");
         check(new StringBuffer().append(bmp).append(1.23456).toString(),
               "\u4e00\u4e01\u4e02\u4e03\u4e04\u4e05\u4e06\u4e07\u4e081.23456");
+
+        ////////////////////////////////////////////////////////////////////
+        check(new StringBuffer((CharSequence)new StringBuffer(ascii)).toString(),
+              ascii);
+        check(new StringBuffer((CharSequence)new StringBuffer(asciiMixed)).toString(),
+              asciiMixed);
     }
 
     private void checkGetChars(StringBuffer sb, int srcBegin, int srcEnd,
             char expected[]) {
         char[] dst = new char[srcEnd - srcBegin];