protected void dropUsers() {
IdentityService identityService = processEngine.getIdentityService();
identityService.deleteUser("kermit");
identityService.deleteGroup("admin");
identityService.deleteMembership("kermit", "admin");
}
/** Each test is assumed to clean up all DB content it entered.
* After a test method executed, this method scans all tables to see if the DB is completely clean.