Function PathsOf

cpp/src/arrow/dataset/test_util_internal.h:1746–1750

                              public MakeFileSystemDatasetMixin {};

static std::vector<std::string> PathsOf(const FragmentVector& fragments) {
  std::vector<std::string> paths(fragments.size());
  std::transform(fragments.begin(), fragments.end(), paths.begin(), PathOf);
  return paths;
}

inline void AssertFilesAre(const std::shared_ptr<Dataset>& dataset,
                           std::vector<std::string> expected) {