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/usr/lib/mysql-testsuite/t/symlink_windows.test is in percona-server-test-5.6 5.6.22-rel71.0-0ubuntu4.

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# Copyright (c) 2012, 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
# 02110-1301  USA
#
# This test checks if for .sym files (symbolic links on Windows) a depreciation warning 
# is existing in the error log.
# Created by Horst Hunger
# Creation date: 2012-11-01

--source include/windows.inc
--source include/not_embedded.inc
let MYSQLD_DATADIR= `select @@datadir`;
perl;
my $fname= "$ENV{'MYSQLD_DATADIR'}testdb.sym";
  open(FILE, ">", $fname) or die;
  print FILE "$ENV{'MYSQLTEST_VARDIR'}/testdb";
  close FILE;
EOF

--disable_warnings
DROP DATABASE IF EXISTS testdb;
--enable_warnings
CREATE DATABASE testdb;
USE testdb;
CREATE TABLE t1 (a int not null auto_increment, b char(16) not null, primary key (a)) 
ENGINE=myisam ;
INSERT INTO t1 (b) VALUES ("test"),("test1"),("test2"),("test3");
SELECT * from t1;

perl;
my $found_pattern = 0;
my $fname= "$ENV{'MYSQLTEST_VARDIR'}/log/mysqld.1.err";
open(FILE, "<", $fname) or die;
my @lines= <FILE>;
# those must be in the file for the test to pass
foreach my $one_line (@lines)
{
   $found_pattern= 1  if ($one_line =~ /Symbolic links based on .sym files are deprecated/);
}
close FILE;
print "Found: $found_pattern\n";
EOF

DROP DATABASE testdb;