// add a cf.
CFMetaData newCf1 = addTestCF("Keyspace1", "MigrationCf_1", "Migration CF");
Migration m1 = new AddColumnFamily(newCf1);
m1.apply();
UUID ver1 = m1.getVersion();
assert DatabaseDescriptor.getDefsVersion().equals(ver1);
// rename it.
Migration m2 = new RenameColumnFamily("Keyspace1", "MigrationCf_1", "MigrationCf_2");