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/usr/lib/mysql-testsuite/r/rollback.result is in percona-server-test-5.6 5.6.22-rel71.0-0ubuntu4.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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drop table if exists t1;
create table t1 (n int not null primary key) engine=myisam;
begin work;
insert into t1 values (4);
insert into t1 values (5);
rollback;
Warnings:
Warning	1196	Some non-transactional changed tables couldn't be rolled back
select @@warning_count;
@@warning_count
1
select @@error_count;
@@error_count
0
show warnings;
Level	Code	Message
Warning	1196	Some non-transactional changed tables couldn't be rolled back
show errors;
Level	Code	Message
select * from t1;
n
4
5
select @@warning_count;
@@warning_count
0
show warnings;
Level	Code	Message
drop table t1;