Testing Main Paths with System Tests

On top of the pyramid of system tests, a system test starts up the whole application and runs requests against its API, verifying that all our layers work in concert.

In a system test for the "Send Money" use case, we send an HTTP request to the application and validate the response as well as the new balance of the account:

@SpringBootTest(webEnvironment = WebEnvironment.RANDOM_PORT)

class SendMoneySystemTest {

  @Autowired

  private TestRestTemplate restTemplate;

  @Test

  @Sql("SendMoneySystemTest.sql")

  void sendMoney() {

  

    Money initialSourceBalance = sourceAccount().calculateBalance();

    Money initialTargetBalance = targetAccount().calculateBalance();

  

    ResponseEntity response = whenSendMoney(

        sourceAccountId(),

       ...