The 15 may schema change release has broken script/create_test_db.sh, in the sense that it doesn't actually create a test database (as you would expect from the name). A test database now has to be created by InitDb.pl, but that file isn't set up to do anything other than work on the READWRITE database. This has made it cumbersome to start developing on musicbrainz on a fresh machine. (once the test database has been created, script/create_test_db.sh can be used without trouble to reset the database – there is usually no need to ever remove the test database again).