End to End Test (synchronous)

OrderProcessingTest.java

public class OrderProcessingTest {
  
  @Autowired
  RestTemplate restTemplate;
  
  @Test
  public void shouldProcessValidOrder() {
    var validOrder = Order.withItems(Item.id("2fa2ac")).withCustomerId("123"); 
    
    // submit Order
    var response = restTemplate.postForEntity("/processOrder", validOrder);
    assertThat(response.getStatusCode()).isEqualTo(HttpStatus.OK);
    assertThat(response.getBody().getStatus()).isEqualTo("PROCESSED");
    
    // validate Payment
    var paymentTransactionId = response.getBody().getPaymentTranscationId();
    var paymentStatus = restTemplate.getForEntity("http://externalPaymentGateway/paymentStatus/" + paymentTransactionId);
    assertThat(paymentStatus).isEqualTo("PAYMENT_PROCESSED");
    
    // validate Shipment
    var shipmentId = response.getBody().getShipmentId();
    var shipmentStatus = restTemplate.getForEntity("http://externalShipmentService/shipmentStatus/" + shipmentId);
    assertThat(shipmentStatus).isEqualTo("QUEUED_FOR_SHIPMENT");
  }
}