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diff --git a/unittest/my_decimal/my_decimal-t.cc b/unittest/my_decimal/my_decimal-t.cc
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+++ b/unittest/my_decimal/my_decimal-t.cc
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+/* Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License.
+
+   This program 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 for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1335  USA */
+
+#include "my_config.h"
+#include "config.h"
+#include <tap.h>
+#include <my_global.h>
+#include <my_sys.h>
+#include <m_string.h>
+#include <sql_string.h>
+#include <my_decimal.h>
+
+
+
+/*
+  Test my_decimal constuctor and assignement operators
+*/
+static int
+test_copy_and_compare()
+{
+  my_decimal d1,d2;
+
+  ulonglong val= 42;
+
+  ok(ulonglong2decimal(val,&d1) == 0, "Pass");
+  d2= d1;
+  my_decimal d3(d1);
+
+  ok(my_decimal_cmp(&d1, &d2) == 0, "Pass");
+  ok(my_decimal_cmp(&d2, &d3) == 0, "Pass");
+  ok(my_decimal_cmp(&d3, &d1) == 0,"Pass");
+
+  ulonglong val1, val2, val3;
+  ok(decimal2ulonglong(&d1, &val1) == 0, "Pass");
+  ok(decimal2ulonglong(&d2, &val2) == 0,"Pass");
+  ok(decimal2ulonglong(&d3, &val3) == 0,"Pass");
+
+  ok(val == val1,"Pass");
+  ok(val == val2,"Pass");
+  ok(val == val3,"Pass");
+
+  // The CTOR/operator=() generated by the compiler would fail here:
+  val= 45;
+  ok(ulonglong2decimal(val, &d1) == 0,"Pass");
+  ok(my_decimal_cmp(&d1, &d2) == 1,"Pass");
+  ok(my_decimal_cmp(&d1, &d3) == 1,"Pass");
+
+  return 0;
+
+}
+
+static int
+test_decimal2string()
+{
+  decimal_t d1;
+  decimal_digit_t buffer[DECIMAL_BUFF_LENGTH+2];
+  char *str_end;
+  const char strnum[]= "0.1234567890123456789012345678901234567890123467";
+  char strbuff[50];
+  int len= 40;
+  int i;
+
+  bzero(strbuff, sizeof(strbuff));
+  str_end= (char *)(strnum + (sizeof(strnum) - 1));
+
+  d1.len= DECIMAL_BUFF_LENGTH + 2;
+  d1.buf= buffer;
+
+  string2decimal(strnum, &d1, &str_end);
+  decimal2string(&d1, strbuff, &len, 0, 0, 'X');
+
+  /* last digit is not checked due to possible rounding */
+  for (i= 0; i < 38 && strbuff[i] == strnum[i]; i++);
+  ok(i == 38, "Number");
+  for (i= 39; i < 50 && strbuff[i] == 0; i++);
+  ok(i == 50, "No overrun");
+
+  return 0;
+
+}
+int main()
+{
+  plan(15);
+  diag("Testing my_decimal constructor and assignment operators");
+
+  test_copy_and_compare();
+  test_decimal2string();
+
+  return exit_status();
+}