@Test public void finish_error_but_null_result_DubboClientRequest() {

  Span span = tracing.tracer().nextSpan().kind(Span.Kind.CLIENT).start();
  Throwable error = new RuntimeException("melted");
  FinishSpan.finish(filter, clientRequest, null, error, span);
  testSpanHandler.takeRemoteSpanWithError(Kind.CLIENT, error);
}