EXPECT_TF_OK(status_);

  const std::string file = io::JoinPath(base, "TestFile.csv");
  WriteString(file, "test");
  EXPECT_TF_OK(status_);

  const std::string subdir = io::JoinPath(base, "SubDir");
  tf_gcs_filesystem::CreateDir(filesystem_, subdir.c_str(), status_);
  EXPECT_TF_OK(status_);
  const std::string subfile = io::JoinPath(subdir, "TestSubFile.csv");
  WriteString(subfile, "test");