Unless efficiency is truly critical, I would avoid Storable, along with any other binary format.
Test suites (both code and data) are a form of documentation, and should be in a human-readable format.
Even when the datasets are generated during one test, and (normally) deleted later toward the end of the test suite, a human-readable (and editable) datastore will save you much frustration when diagnosing a failed test.
I have used Data::Dumper, YAML, and Config::Tiny on different projects. I think that Config::Tiny is better suited to true config files that a non-programmer will be editing. If I was saving shared test data today, JSON::XS would be my first choice.
Note that you need not just bundle the data. You can also bundle helper subroutines, that might simply return the data, or might *generate* the data in some expanded format that your tests can easily use, rather than whatever compact format the data might actually live in.
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