DubboClientResponse extends RpcClientResponse implements DubboResponse { @Override public String errorCode() { return DubboParser.errorCode(error); } DubboClientResponse(
    DubboClientRequest request, @Nullable Result result, @Nullable Throwable error); @Override Result result(); @Override Result unwrap(); @Override DubboClientRequest request(); @Override Throwable error(); @Override String errorCode();  }
@Test public void errorCode() { assertThat(response.errorCode()).isEqualTo("TIMEOUT_EXCEPTION"); }