The cpan-testers-discuss mailing list would be the best place to ask about stuff like this. But yes, SQLite is a good choice. MySQL is a good second choice as it's fairly commonly installed. Anything more exotic probably won't get tested much, or, indeed, at all, because setting up things like Oracle is a pain in the arse.

In reply to Re^2: How to do automated tests of a database centric CPAN module by DrHyde
in thread How to do automated tests of a database centric CPAN module by jds17

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