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CHAPTER 4 TEST-DRIVEN MYSQL DEVELOPMENT
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every path through the system (known as path testing). These tests can be considered of the verification variety because they establish whether the architecture was built correctly and that it followed the prescribed process.
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MySQL Testing
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There are a variety of ways to test the MySQL system. You can test the server connectivity and basic functionality using the mysqlshow command, run tests manually using the client tools, use the benchmarking tools to establish performance characteristics, and even conduct profiling on the server. The tools of choice for most database professionals are the MySQL Test Suite and the MySQL Benchmarking tool. The following sections describe each of these facilities and techniques.
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Using the MySQL Test Suite
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MySQL AB has provided the community with a capable testing facility called the MySQL Test Suite. The test suite is an executable named mysqltest (mysql-test.exe in Windows) and a collection of Perl modules and scripts designed to exercise the system and compare the results. Table 4-1 lists the directories and their contents. The test suite comes with the Unix/Linux binary and source distributions, although it is included in some Windows distributions.
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Note The MySQL Test Suite does not currently run in the Windows environment. This would be an excellent
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project to take on if you wanted to contribute to the development of MySQL through the MySQL code contribution program. It can be run in the Cygwin environment if the Perl environment is set up and the Perl DBI modules are installed. See the Perl Installation Notes section in the MySQL Reference Manual for more details.
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Table 4-1. Directories under the mysql-test Directory
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/misc /ndb /r /std_data /t
Contents
Additional miscellaneous Perl scripts A complete set of cluster tests Result files of the tests run Test data for the test suite The tests
When MySQL is installed, you will find the mysql-test-run.pl Perl script in the mysql-test directory under the installation directory. Best of all, the test suite is extensible. You can write your own tests and conduct testing for your specific application or need. The tests are designed as regression tests in the sense that the tests are intended to be run to ensure all the functionality works as it has in the past.
CHAPTER 4 TEST-DRIVEN MYSQL DEVELOPMENT
The tests are located in a directory under the mysql-test directory named simply /t. This directory contains nearly 600 tests. While that may sound comprehensive, the MySQL documentation states that the test suite does not cover all the features of the system. The current set of tests is designed to detect bugs in most SQL commands, the operating system and library interactions, and cluster and replication functionality. MySQL AB hopes to ultimately accumulate enough tests to provide test coverage for the entire system. Indeed, MySQL AB has an open call for additional tests. The goal is to establish a set of tests that test 100 percent of the features of the MySQL system. If you create additional tests you feel cover a feature that isn t already covered by one of the tests in the mysql-test/t directory, feel free to submit your tests to MySQL AB.
Tip You can find more information about the MySQL Test Suite by visiting the MySQL Internals mailing list
(see http://lists.mysql.com/ for more details and to see the available lists). You can also submit your tests for inclusion by sending an e-mail message to the list. You should upload your test files to the ftp:// ftp.mysql.com/pub/mysql/upload/ FTP site. If you decide to send your tests to MySQL AB for inclusion in the test suite, be sure you are using data that you can show the world. The tests are available to everyone. For example, I am sure your friends and relatives would not want their phone numbers showing up in every installation of MySQL!
For each test, a corresponding result file is stored in the mysql-test/r directory. The result file contains the output of the test run and is used to compare (using the diff command) the results of the test as it is run. In many ways, the result file is the benchmark for the output of the test. This enables you to create tests and save the expected results, then run the test later and ensure that the system is producing the same output. However, you must use this premise with some caution. Data values that, by their nature, change between executions can be used but require additional commands to handle properly. Unfortunately, data values like these are ignored by the test suite rather than compared directly. Thus, time and date fields are data types that could cause some issues if used in a test. I ll discuss more on this topic and other commands in a moment.
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