gistfile1.rs

   #[test]
    fn test_from_file() {
        let tmp_dir = io::TempDir::new("jsontest").unwrap();
        let tmp_file: io::File = io::File::create(tmp_dir.path()).unwrap();
        let tmp_path: Path = *tmp_file.path();                                                                                                       
        let mut tmp_out = io::BufferedWriter::new(tmp_file);                                                                                         

        tmp_out.write_str(valid_cfg_json());
        tmp_out.flush();

        super::from_file(&tmp_path);
    }