Testing with Hoverfly and Java Part 2: Delays

On the previous post we implemented json and Java based Hoverfly scenarios..

Now it’s time to dive deeper and use other Ηoverfly features.

A big part of testing has to do with negative scenarios. One of them is delays. Although we always mock a server and we are successful to reproduce erroneous scenarios one thing that is key to simulate in todays microservices driven world is delay.

So let me make a server with a 30 secs delay.

public class SimulateDelayTests {

    private Hoverfly hoverfly;

    @BeforeEach

    void setUp() {

        var simulation = SimulationSource.dsl(service("http://localhost:8085")

                .get("/delay")

                .willReturn(success("{\"username\":\"test-user\"}", "application/json").withDelay(30, TimeUnit.SECONDS)));

        var localConfig = HoverflyConfig.localConfigs().disableTlsVerification().asWebServer().proxyPort(8085);

        hoverfly = new Hoverfly(localConfig, SIMULATE);

        hoverfly.start();

        hoverfly.simulate(simulation);

    }

    @AfterEach

    void tearDown() {

        hoverfly.close();

    }

}

Let’s add the Delay Test

@Test

void testWithDelay() {

   var client = HttpClient.newHttpClient();

   var request = HttpRequest.newBuilder()

         .uri(URI.create("http://localhost:8085/delay"))

         .build();

   var start = Instant.now();

   var res = client.sendAsync(request, HttpResponse.BodyHandlers.ofString())

         .thenApply(HttpResponse::body)

         .join();

   var end = Instant.now();

   Assertions.assertEquals("{\"username\":\"test-user\"}", res);

   var seconds = Duration.between(start, end).getSeconds();

   Assertions.assertTrue(seconds >= 30);

}

Delay simulation is there, up and running, so let’s try to simulate timeouts.

@Test

    void testTimeout() {

        var client = HttpClient.newHttpClient();

        var request = HttpRequest.newBuilder()

                .uri(URI.create("http://localhost:8085/delay"))

                .timeout(Duration.ofSeconds(10))

                .build();

        assertThrows(HttpTimeoutException.class, () -> {

                    try {

                        client.sendAsync(request, HttpResponse.BodyHandlers.ofString()).join();

                    } catch (CompletionException ex) {

                        throw ex.getCause();

                    }

                }

        );

    }