Function lazy_temp_dir_creation

datafusion/execution/src/disk_manager.rs:481–498

()

    #[test]
    fn lazy_temp_dir_creation() -> Result<()> {
        // A default configuration should not create temp files until requested
        let dm = Arc::new(DiskManagerBuilder::default().build()?);

        assert_eq!(0, local_dir_snapshot(&dm).len());

        // can still create a tempfile however:
        let actual = dm.create_tmp_file("Testing")?;

        // Now the tempdir has been created on demand
        assert_eq!(1, local_dir_snapshot(&dm).len());

        // the returned tempfile file should be in the temp directory
        let local_dirs = local_dir_snapshot(&dm);
        assert_path_in_dirs(actual.path(), local_dirs.iter().map(|p| p.as_path()));

        Ok(())
    }

    fn local_dir_snapshot(dm: &DiskManager) -> Vec<PathBuf> {
        dm.local_dirs