@Override
  public Optional<ProtobufSystemInfo.SystemInfo> retrieveSystemInfo() {
    return call(SystemInfoActionClient.INSTANCE);
  }
@Test
  public void retrieveSystemInfo_returns_absent_if_process_is_down() {
    Optional<ProtobufSystemInfo.SystemInfo> info = underTest.retrieveSystemInfo();

    assertThat(info).isEmpty();
  }