Spring Unit testing rest controller

What's the best and easiest solution to test this sample get mapping's? Could you show some easy example?

    @GetMapping("/")
public List<UserDto> get() {
    return userService.getUsers().stream().map((User user) -> toUserDto(user)).collect(Collectors.toList());
}

@GetMapping(path = "/{id}")
public HttpEntity<UserDto> findById(@PathVariable(name = "id") long id) {
    User user = userService.unique(id);
    if (user != null) {
        return new ResponseEntity<>(toUserDto(user), HttpStatus.OK);
    } else {
        return new ResponseEntity<>(HttpStatus.NOT_FOUND);
    }
}