ringbuf 0.4.8

Lock-free SPSC FIFO ring buffer with direct access to inner data
Documentation 
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use super::Rb;
use crate::{storage::Array, traits::*};
use core::fmt::Write;

#[test]
fn write() {
    let mut rb = Rb::<Array<u8, 40>>::default();

    let (mut prod, cons) = rb.split_ref();

    assert_eq!(write!(prod, "Hello world!\n"), Ok(()));
    assert_eq!(write!(prod, "The answer is {}\n", 42), Ok(()));

    assert_eq!(cons.occupied_len(), 30);
    assert!(cons.into_iter().eq(b"Hello world!\nThe answer is 42\n".iter().copied()));
}

#[test]
fn write_overflow() {
    let mut rb = Rb::<Array<u8, 10>>::default();

    let (mut prod, mut cons) = rb.split_ref();

    assert_eq!(
        write!(prod, "This is a very long string that will overflow the small buffer\n"),
        Err(core::fmt::Error)
    );

    assert_eq!(cons.occupied_len(), 10);
    assert!(cons.pop_iter().eq(b"This is a ".iter().copied()));

    assert_eq!(
        write!(prod, "{} {} {} {} {}\n", "This", "string", "will", "also", "overflow"),
        Err(core::fmt::Error)
    );

    assert_eq!(cons.occupied_len(), 10);
    assert!(cons.pop_iter().eq(b"This strin".iter().copied()));
}