@Test
public void grpcErrors() {

    cellOne.getServiceRegistry().addService(new CellWithHealthStatus(ok("one")));
    cellTwo.getServiceRegistry().addService(new HealthGrpc.HealthImplBase() {
        @Override
        public void check(HealthCheckRequest request, StreamObserver<HealthCheckResponse> responseObserver) {
            responseObserver.onError(Status.DEADLINE_EXCEEDED.asRuntimeException());
        }
    });
    AssertableSubscriber<HealthCheckResponse> subscriber = service.check(HealthCheckRequest.newBuilder().build()).test();
    subscriber.awaitTerminalEvent(10, TimeUnit.SECONDS);
    subscriber.assertNoErrors();
    subscriber.assertValueCount(1);
    HealthCheckResponse response = subscriber.getOnNextEvents().get(0);
    assertThat(response.getStatus()).isEqualTo(NOT_SERVING);
    assertThat(response.getDetailsCount()).isEqualTo(2);
    List<ServerStatus> errors = response.getDetailsList().stream()
            .filter(ServerStatus::hasError)
            .collect(Collectors.toList());
    assertThat(errors).hasSize(1);
    assertThat(errors.get(0).getError().getCell()).isEqualTo("two");
    assertThat(errors.get(0).getError().getErrorCode()).isEqualTo(DEADLINE_EXCEEDED.toString());
}