Service Test (point-to-point)

PaymentServiceTest.java

@SpringBootTest
public class PaymentServiceTest {

  @Autowired
  private RestTemplate restTemplate;
  
  @Test
  public void shouldProcessPaymentForValidOrder() {
    var validOrder = Order
      .withCustomerId(123)
      .withItems(Item.withId("af12da"));
    
    var response = restTemplate.postForEntity("/payment", validOrder);
    assertThat(response.getStatusCode()).isEqualTo(HttpStatus.OK);
    assertThat(response.getBody().getPaymentTransactionId()).isNotNull();
  }
  
  @Test
  public void shouldRejectPaymentForOrderWithMissingCustomer() {
    var validOrder = Order
      .withItems(Item.withId("af12da"));
    
    var response = restTemplate.postForEntity("/payment", validOrder);
    assertThat(response.getStatusCode()).isEqualTo(HttpStatus.BAD_REQUEST);
    assertThat(response.getBody().getPaymentTransactionId()).isNull();
  }

}