@Override
  public Optional<ProtobufSystemInfo.SystemInfo> retrieveSystemInfo() {
    return call(SystemInfoActionClient.INSTANCE);
  }
@Test
  public void retrieveSystemInfo_get_information_if_process_is_up() {
    Buffer response = new Buffer();
    response.read(ProtobufSystemInfo.Section.newBuilder().build().toByteArray());
    server.enqueue(new MockResponse().setBody(response));

    // initialize registration of process
    setUpWithHttpUrl(ProcessId.COMPUTE_ENGINE);

    Optional<ProtobufSystemInfo.SystemInfo> info = underTest.retrieveSystemInfo();
    assertThat(info.get().getSectionsCount()).isZero();
  }