Monday, August 06, 2007

Summer of Code pleasures

Summer of Code image

As a professional tester, I have a dream about a tool that will let me use my favorite SQL manager, and at the same time create tests ready to be plugged to the regression test suite.
I have been dreaming and planning about it, and finally the magic tool is shaping up.
I am mentoring a Summer of Code project, assigned to Charlie Cahoon. After a long preparatory work and much planning, the MySQL test creator is finally out!
Initially, it was planned as a separated tool, a replacement for the MySQL command line. The idea is that you write queries and eye the results, while the tool in background is writing a polished test script. That would have been a good tool, multi platform, easy to use, but limited to the command line.
Then the MySQL Proxy came along, and we decided to use it as a backend. Thus the tool, instead of being written in C++, it ended up in Lua. Kudos to Charlie for learning the language very quickly and for coding it.
The tool is not ready yet. It has just the basic features, but it has now reached the stage when it can actually produce a simple test script+result pair.
For example, This is what I would type to check that the CREATE, INSERT, and SELECT statements are supported (not exhaustive test, of course!)
mysql> start;  # This is a macro from the magic tool
Query OK, 0 rows affected (0.00 sec)

mysql> drop table if exists t1;
Query OK, 0 rows affected, 1 warning (0.00 sec)

mysql> create table t1 (id int, c char(10));
Query OK, 0 rows affected (0.02 sec)

mysql> insert into t1 values (1,'a'), (2,'b');
Query OK, 2 rows affected (0.00 sec)
Records: 2 Duplicates: 0 Warnings: 0

mysql> select * from t1;
+------+------+
| id | c |
+------+------+
| 1 | a |
| 2 | b |
+------+------+
2 rows in set (0.01 sec)

mysql> stop; # another macro. The tool stops recording now
Query OK, 0 rows affected (0.01 sec)

mysql> exit
What I see on the screen is not what I need to get in a test script. If I had found a bug here and I wanted to submit it, I would have to do some cut-and-pasting and clean-up. Instead, the mysql-test-creator is doing that for me.
$ cat creator.test
--disable_warnings
DROP TABLES if exists t1;
--enable_warnings
create table t1 (id int, c char(10));
insert into t1 values (1), (2);
insert into t1 values (1,'a'), (2,'b');
select * from t1;

$ cat creator.result
DROP TABLES if exists t1;
create table t1 (id int, c char(10));
insert into t1 values (1,'a'), (2,'b');
select * from t1;
id c
1 a
2 b
Isn't it sweet?
Bravo Charlie!

More is coming. The tool will support multiple sessions at once, with the creation of a unified test script from several sessions. Stay tuned!

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