assertTrue(group.getUsers().contains(user1));
UserDto userDto1 = mapperFacade.map(user1, UserDto.class);
UserGroupDto groupDto = mapperFacade.map(group, UserGroupDto.class);
groupDto.removeUser(userDto1);
mapperFacade.map(groupDto, group,
TypeFactory.valueOf(UserGroupDto.class),
TypeFactory.valueOf(UserGroup.class));