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CHAPTER 4 TEST-DRIVEN MYSQL DEVELOPMENT
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Creating your own tests and running them is easy to do. You can repeat the process I just described as many times as you want for as many tests as you want. As you can see, this process follows the spirit of test-driven development by first creating the test, running it without proof of results, creating the solution (the expected results), and then executing the test and verifying successful test completion. I encourage you to adopt the same philosophy when creating your own MySQL applications and especially when extending the MySQL server. For example, say you want to create a new SHOW command. In this case, you should create a new test to execute the new command, run it, and establish the test results. Naturally, the test will fail every time until you actually create the new command. The benefit of this philosophy is that it allows you to focus on the results of the command and how the command syntax should be prior to actually writing the code. If you adopt this philosophy for all your development, you won t regret it and will see dividends in the quality of your code. Once you have implemented the command and verified that it works by running the test again and examining the reject file (or running the command manually), you can copy the reject file to the result file, which the test suite will use for verification (pass/fail) in later test runs.
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The MySQL Test Suite provides a rich set of commands you can use to create powerful tests. This section introduces some of the popular and useful commands. Unfortunately, no comprehensive document exists that explains all the available commands. The following are those that I found by exploring the supplied tests and online posts.
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Tip If you use the advanced test suite commands, you can create the result file using the --record command-line parameter to record the proper results. For example, you can run the command ./mysql-test-run.pl --record cab to record the results of the cab test file.
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If you re expecting a certain error to occur (say you re testing the presence of errors rather than the absence of detecting them), you can use the --error num command. This command tells the test suite that you expect the error specified and that it should not fail the test when that error occurs. This command is designed to precede the command that produces the error. You can also specify additional error numbers separated by commas. For example, --error 1550, 1530 indicates these (fictional) errors are permitted for the command that follows. You can also use flow of control code inside your test. For example, you can use a loop to execute something for a fixed number of times. The following code example executes a command 100 times: let $1=100; while ($1) { # Insert your commands here dec($1) }
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CHAPTER 4 TEST-DRIVEN MYSQL DEVELOPMENT
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Another useful command is sleep. The sleep command takes as a parameter the number of seconds to pause before executing the next command. For example, --sleep 3.5 tells the test suite to pause for 3.5 seconds before executing the next command. This command can help if there is unexpected latency in the network or if you re experiencing tests failing due to heavy traffic. Using the sleep command will allow you to slow down the test, thereby reducing any interference due to poor performance. If you are interested in seeing additional information about a command, you can use the --enable_metadata command. This produces and displays internal metadata that may assist you in debugging commands for a complex test. Similarly, if you want to suppress the recording of the output, you can use --disable_result_log to turn off recording and --enable_result_log to turn it back on. If you have commands that result in data that may change between runs (like date or time fields), you can tell the test suite to ignore those values by substituting another character string using the --replace_column column string command. For example, if your output produces the current time in the second column (column counting begins at 1, not 0), you can use the command --replace_column 2 CURTIME. This tells the test suite that the output from the next command is to have column 2 replaced with the string CURTIME. While this does suppress the actual value in the output, it provides a way to ignore those values that cannot be predicted because they change between test runs. Finally, if you need to include additional test commands within a test, you can use the --source include/filetoinclude.inc to include a file from the mysql-test/include directory. This practice is typical in tests that form a test suite with a set of commonly used commands.
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