assertNotNull("JahiaUserManagerService cannot be retrieved", userManager);
user1 = userManager.createUser("user1", "password", new Properties());
user2 = userManager.createUser("user2", "password", new Properties());
user3 = userManager.createUser("user3", "password", new Properties());
user4 = userManager.createUser("user4", "password", new Properties());
JahiaGroupManagerService groupManager = ServicesRegistry.getInstance().getJahiaGroupManagerService();
assertNotNull("JahiaGroupManagerService cannot be retrieved", groupManager);
group1 = groupManager.createGroup(site.getID(), "group1", new Properties(), false);