我嘗試為我的刪除方法進行服務模擬測試。這是我的RestoranServiceImpl.java中的刪除方法public void deleteRestoran(Long idRestoran) {        RestoranModel restoran = getRestoranByIdRestoran(idRestoran).get();        if(restoran.getListMenu().size()==0){            restoranDb.delete(restoran);        }else{            UnsupportedOperationException unsupportedOperationException = new UnsupportedOperationException();            throw unsupportedOperationException;        }    }這是我的RestoranDb.javapublic interface RestoranDb extends JpaRepository<RestoranModel,Long> {    Optional<RestoranModel> findByIdRestoran(Long idRestoran);}這是到目前為止我的刪除方法@Test    public void whenDleleteValidRestoranItShouldCallRestoranRepositoryDelete() {        RestoranModel newRestoran = new RestoranModel();        newRestoran.setIdRestoran((long) 1);        newRestoran.setNama("mekdi");        newRestoran.setAlamat("pacil");        newRestoran.setNomorTelepon(14045);        restoranService.addRestoran(newRestoran);        verify(restoranDb, times(1)).save(newRestoran);        System.out.println(restoranService.getRestoranList().size());        when(restoranDb.findByIdRestoran((long)1).get()).thenReturn(newRestoran).thenReturn(null);        restoranService.deleteRestoran(newRestoran.getIdRestoran());        verify(restoranDb, times(1)).delete(newRestoran);    }當我嘗試運行它時，我收到此錯誤。java.util.NoSuchElementException: No value present我試圖四處尋找解決方案，但找不到適合我的解決方案。