### Question:
JsonRpcHttpService { private void handleEmptyRequest(final RoutingContext routingContext) { routingContext.response().setStatusCode(201).end(); } JsonRpcHttpService(
      final Vertx vertx,
      final Path dataDir,
      final JsonRpcConfiguration config,
      final MetricsSystem metricsSystem,
      final NatService natService,
      final Map<String, JsonRpcMethod> methods,
      final HealthService livenessService,
      final HealthService readinessService); private  JsonRpcHttpService(
      final Vertx vertx,
      final Path dataDir,
      final JsonRpcConfiguration config,
      final MetricsSystem metricsSystem,
      final NatService natService,
      final Map<String, JsonRpcMethod> methods,
      final Optional<AuthenticationService> authenticationService,
      final HealthService livenessService,
      final HealthService readinessService); CompletableFuture<?> start(); CompletableFuture<?> stop(); InetSocketAddress socketAddress(); @VisibleForTesting String url(); @VisibleForTesting final Optional<AuthenticationService> authenticationService; }### Answer:
@Test public void handleEmptyRequest() throws Exception { try (final Response resp = client.newCall(buildGetRequest("")).execute()) { assertThat(resp.code()).isEqualTo(201); } }