Windows installer

Thanks - I've added a note that some setups remove the test database by running mysql_secure_installation. Was this the case in your setup? Please clarify the version and how MariaDB was installed.

I do not think anything has removed the test database. The installer just does not create it under Microsoft Windows. There is no option to skip creating it. It would help if you could tell us how to create it by hand.

what MariaDB version was it?

10.6

as for Windows installer, the "test" database was removed by the commit 9a8498066865b508239b36853403f2700800af2b
(MDEV-12645 mysql_install_db: no install test db option)
here https://github.com/MariaDB/server/commit/9a8498066865b508239b36853403f2700800af2b#diff-8295fec0c74a8120051599f94afb8a6a665712698a8261d133cd56d8b987d849

Microsoft Windows desktop installer should have the option to install the test database provided as a configuration step. Whether it should be enabled by default is a matter of discussion. I say it should be on because it is a breaking change.

I tend to think that we do not really need that database, and option. For the last 4 years, it did not bother anyone, so the status quo is "no test database". The added value of this option is truly minimal. MariaDB Primer was already changed to say it is not created on Windows, and it documents "CREATE DATABASE IF NOT EXISTS test; USE test;" too.
I'm still assigning this to Ian, perhaps clarification is needed for the case if there is no user database at all, in "Logging into MariaDB" paragraph.

CREATE DATABASE is not enough, the test database must be unprotected.

Clarified that the db_name can be left out. yecril71pl what do you mean by "the test database must be unprotected"?

Anybody is allowed to do anything in the test database.