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Improve the documentation that will be installed in the mysql-test RPM.
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diff -up mariadb-10.0.10/mysql-test/README.p3 mariadb-10.0.10/mysql-test/README
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--- mariadb-10.0.10/mysql-test/README.p3	2014-04-07 16:05:51.402631548 +0200
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+++ mariadb-10.0.10/mysql-test/README	2014-04-07 16:06:06.137637991 +0200
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@@ -1,15 +1,28 @@
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-This directory contains a test suite for the MySQL daemon. To run
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-the currently existing test cases, simply execute ./mysql-test-run in
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-this directory. It will fire up the newly built mysqld and test it.
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-
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-Note that you do not have to have to do "make install", and you could
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-actually have a co-existing MySQL installation. The tests will not
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-conflict with it. To run the test suite in a source directory, you
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-must do make first.
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-
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-All tests must pass. If one or more of them fail on your system, please
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-read the following manual section for instructions on how to report the
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-problem:
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+This directory contains a test suite for the MariaDB daemon. To run
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+the currently existing test cases, execute ./mysql-test-run in
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+this directory.
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+
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+For use in Red Hat distributions, you should run the script as user mysql,
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+who is created with nologin shell however, so the best bet is something like
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+       $ su -
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+       # cd /usr/share/mysql-test
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+       # su -s /bin/bash mysql -c "./mysql-test-run --skip-test-list=rh-skipped-tests.list"
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+
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+This will use the installed mysql executables, but will run a private copy
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+of the server process (using data files within /usr/share/mysql-test),
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+so you need not start the mysqld service beforehand.
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+
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+The "--skip-test-list=rh-skipped-tests.list" option excludes tests that are
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+known to fail on one or more Red-Hat-supported platforms.  You can omit it
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+if you want to check whether such failures occur for you.  Documentation
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+about the reasons for omitting such tests can be found in the file
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+rh-skipped-tests.list.
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+
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+To clean up afterwards, remove the created "var" subdirectory, eg
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+       # su -s /bin/bash - mysql -c "rm -rf /usr/share/mysql-test/var"
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+
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+If one or more tests fail on your system, please read the following manual
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+section for instructions on how to report the problem:
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 http://kb.askmonty.org/v/reporting-bugs
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@@ -26,7 +39,8 @@ other relevant options.
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 With no test cases named on the command line, mysql-test-run falls back
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 to the normal "non-extern" behavior. The reason for this is that some
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-tests cannot run with an external server.
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+tests cannot run with an external server (because they need to control the
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+options with which the server is started).
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 You can create your own test cases. To create a test case, create a new
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 file in the t subdirectory using a text editor. The file should have a .test