@Test public void create_error_but_null_result_value_DubboClientRequest() {

  Span span = tracing.tracer().nextSpan().kind(CLIENT).start();
  Throwable error = new RuntimeException("melted");
  FinishSpan.create(filter, clientRequest, mock(Result.class), span)
      .accept(null, error);
  testSpanHandler.takeRemoteSpanWithError(CLIENT, error);
}