如何使用Spring 5反应堆WebFlux检查单元测试中的步骤？

我正在从命令式模式迁移到反应式模式，我很难以反应式的方式测试我的mock回调。例如，在服务类中是否可以检查是否调用了mock

TransactionId transactionId = authorizerApplicationService.newPaymentAuthorization(
            new PaymentTransactionCommand(
                    OPERATION_ID,
                    TAX_ID));

final ArgumentCaptor<Transaction> argumentsTransaction = ArgumentCaptor.forClass(Transaction.class);

verify(repository, times(2)).save(argumentsTransaction.capture());

final Transaction transaction = argumentsTransaction.getValue();

verify(iamServicePort).authenticate(...));

verify(antiFraudServicePort).checkCustomerSituation(...);

verify(paymentGatewayServicePort, times(0)).authorize(...);

assertEquals(transactionId,         transaction.transactionId());
assertEquals(Money.of(100, "BRL"),  transaction.amount());

考虑到我所有的外部服务都返回Void，我如何进行呼叫验证

StepVerifier.create(authorizerApplicationService.newPaymentAuthorization(
            new PaymentTransactionCommand(
                    OPERATION_ID,
                    TAX_ID)))
      .expectNext(OPERATION_ID)
       //I need to check here if the mocks were invoked
      .verifyComplete();