private void stubServiceToReturnExistingUsers(int howMany) {
   when(userService.getAll()).thenReturn(UserUtil.createUserList(howMany));
 }
 private User stubServiceToReturnStoredUser() {
   final User user = UserUtil.createUser();
   when(userService.create(any(User.class))).thenReturn(user);
   return user;
 }