Function ASSERT_OK_AND_ASSIGN

cpp/src/arrow/filesystem/s3fs_test.cc:1111–1119

      const std::string file_path = dir_path + "/" + file_name;
      expected_infos.emplace_back(file_path, FileType::File);
      ASSERT_OK_AND_ASSIGN(Future<> task,
                           ::arrow::internal::GetCpuThreadPool()->Submit(
                               [fs = fs_, file_name, file_path]() -> Status {
                                 ARROW_ASSIGN_OR_RAISE(
                                     std::shared_ptr<io::OutputStream> out_str,
                                     fs->OpenOutputStream(file_path));
                                 ARROW_RETURN_NOT_OK(out_str->Write(file_name));
                                 return out_str->Close();
                               }));
      tasks.push_back(std::move(task));
    }
    ASSERT_FINISHES_OK(AllFinished(tasks));