Hello; I've recently put up my Liquiunit project at Github.
Liquiunit contains JUnit Rules for setting up H2 in-memory databases that can work well with parallel Maven Surefire/JUnit tests, Rules for running Liquibase on those databases, and Rules for running dbUnit on those databases as well. All such rules can be nested, so, for example, you can set up a private per-thread in-memory H2 database whose structure is initialized by Liquibase and whose test data is managed by dbUnit, all while running your tests with parallel processes and threads.
Here's the URL: http://ljnelson.github.io/liquiunit
I hope some folks find this helpful.
Best,
Laird