CheckpointReader::BuildV2VarMaps() {
  CHECK(v2_reader_ != nullptr);
  CHECK(v2_reader_->status().ok());

  // First pass: filters out the entries of the slices.
  std::unordered_set<string> filtered_keys;
  BundleEntryProto entry;
  v2_reader_->Seek(kHeaderEntryKey);
  for (v2_reader_->Next(); v2_reader_->Valid(); v2_reader_->Next()) {

  if (!status.ok()) GTEST_SKIP() << "CreateDir() not supported: " << status;

  int64_t undeleted_files = 0;
  int64_t undeleted_dirs = 0;
  status = env_->DeleteRecursively(dirpath, &undeleted_files, &undeleted_dirs);
  EXPECT_PRED2(UnimplementedOrReturnsCode, status, Code::OK);
  EXPECT_EQ(undeleted_files, 0);
  EXPECT_EQ(undeleted_dirs, 0);
}

TEST_P(ModularFileSystemTest, TestDeleteRecursivelyNotEmpty) {