如何为春季重试逻辑编写单元测试？

Question

我有一个服务类，如下所示，我试图测试重试逻辑

public class RemoteService {
    
    private RestTemplate restTemplate;
    
    @Inject
    public RemoteService(RestTemplate restTemplate) {
    this.restTemplate = restTemplate;
    }
    
    @Retryable(maxAttempts =3, value = Exception.class, backoff = @Backoff(delay=2000, multiplier = 2))
    public List<Accounts> getData() {
    
       try {
    
            List<Account>  accounts  = restTemplate.exchange("https://accounts/get/data", HttpMethod.POST, getHttpHeaders(),new ParameterizedTypeRefernce<>);
    
            if (accounts == null) {
                    throw new EmptyAccountsException("No accounts retrieved")'
            }
        }
        catch(Exception ex) {
           ex.printStackTrace();
           throw ex;
        }
    
        return accounts;
    }
}

，下面是上述服务的junit，

@RunWith(MockitoJUnitRunner.class)
public class RemoteServiceTest {
   private RemoteService remoteService;
   
   @Mock
   RestTemplate mockRestTemplate;

   @Before
   public void setup() {
            MockitoAnnotations.initMocks(this);
            remoteService = new RemoteService(mockRestTemplate);
   }

   @Test
   public void testRetry() {
         when(mockRestTemplate.exchange()).thenReturn(null);
         remoteService.getData();
         verify(mockRestTemplate, times(3)).exchange("https://accounts/get/data", HttpMethod.POST, getHttpHeaders(),new ParameterizedTypeReference<List<Accounts>>);
   }
}

在上述测试后，方法getData未称为3次。它在第一个例外后停止。

请告知这里有什么问题，以及为什么第一次抛出异常时，getData方法不会被调用3次。