我试图验证一个restclientexception错误。我的代码如下，如果您能提供帮助，我将不胜感激。这是我的测试类：'
`

@Test
void test_update_customer_in_ath0_server_error(){
    //given
    ResponseEntity<String> responseEntity = new ResponseEntity<>(HttpStatus.SERVICE_UNAVAILABLE);
    doReturn(responseEntity)
            .when(restTemplate).exchange(any(), eq(HttpMethod.PATCH), any(HttpEntity.class), (Class<String>)any());

    idpFacadeClient.updateCustomerFirstNameInIdp(updateRecordsDto);

    //then
    verify(restTemplate).exchange(any(), eq(HttpMethod.PATCH), argThat(this::verifyUpdatedCustomerBody), (Class<String>)any());
}

这是从我的injectMock类中得到的
`

try {
    response = restTemplate.exchange(URI.create(idpFacadeUpdateUrl), HttpMethod.PATCH, entity,  String.class);
    if (response.getStatusCode() == HttpStatus.OK) {
        log.info("customer first name update success {} with status {}", customerUpdateRecordsDto.getFirstName(), response.getStatusCode());
    }else {
        log.error("Customer first name update failed in IDP for {} with status {}", customerUpdateRecordsDto.getFirstName(), response.getStatusCode());
    }
} catch (RestClientException e) {
    throw new RestClientException("Idp facade API error for user first name " + customerUpdateRecordsDto.getFirstName(), e);
}

`