How hard would it be to use this as an in-memory replacement for MySQL for testing, let's say, a Rails project? Given how important the DB layer is I would be

How hard would it be to use this as an in-memory replacement for MySQL for testing, let's say, a Rails project? Given how important the DB layer is I would be careful to use something like this in production, but if it allows speeding up the test suite it could be really interesting.