return tsl::string("dummy_path");
  }

  // This is the part that would break the `CreateTmpDir` function because it
  // fails to provide a valid file system.
  absl::Status GetFileSystemForFile(const std::string& fname,
                                    tsl::FileSystem** result) override {
    return absl::InternalError("Broken file system");
  }

 private:

                                              root_dir_);
    }
    env_ = Env::Default();
  }

  void SetUp() override {
    FileSystem* fs = nullptr;
    Status s = env_->GetFileSystemForFile(root_dir_, &fs);
    if (fs == nullptr || !s.ok())
      GTEST_SKIP() << "No filesystem registered: " << s;

    s = fs->CreateDir(root_dir_);
    if (!s.ok()) {