Description:

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.