substrate-data 0.1.0

One data model, text syntax, binary form, packed frames and schema system — for any program's files, saves and wire messages.
Documentation 
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//! Frames over a byte stream: round trips, cut and oversized frames.

use super::*;

#[test]
fn frames_follow_each_other_and_end_cleanly() {
    let mut pipe = Vec::new();
    write_frame(&mut pipe, &"hello".to_string()).unwrap();
    write_frame(&mut pipe, &vec![1u32, 2, 3]).unwrap();
    let mut r = pipe.as_slice();
    assert_eq!(
        read_frame::<String>(&mut r).unwrap().as_deref(),
        Some("hello")
    );
    assert_eq!(read_frame::<Vec<u32>>(&mut r).unwrap(), Some(vec![1, 2, 3]));
    assert_eq!(read_frame::<String>(&mut r).unwrap(), None);
}

#[test]
fn a_cut_or_oversized_frame_is_an_error() {
    let mut pipe = Vec::new();
    write_frame(&mut pipe, &"hello".to_string()).unwrap();
    let cut = &pipe[..pipe.len() - 1];
    assert!(read_frame::<String>(&mut &cut[..]).is_err());
    let huge = (u32::try_from(MAX_FRAME).unwrap() + 1).to_le_bytes();
    assert!(read_frame_bytes(&mut &huge[..]).is_err());
}