Testing with databases can be tricky. If you are developing a system
married to a single database then you can make some assumptions
about your environment and ask the user to provide relevant connection
information. But if you need to test a framework that uses DBI,
particularly a framework that uses different types of persistence
schemes, then it may be more useful to simply verify what the
framework is trying to do -- ensure the right SQL is generated and
that the correct parameters are bound. DBD::Mock makes it easy to
just modify your configuration (presumably held outside your code)
and just use it instead of DBD::Foo (like DBD::Pg or DBD::mysql)
in your framework.
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