| use crate::io::prelude::*; |
| use crate::io::{empty, repeat, sink, BorrowedBuf, Empty, Repeat, SeekFrom, Sink}; |
| |
| use crate::mem::MaybeUninit; |
| |
| #[test] |
| fn sink_sinks() { |
| let mut s = sink(); |
| assert_eq!(s.write(&[]).unwrap(), 0); |
| assert_eq!(s.write(&[0]).unwrap(), 1); |
| assert_eq!(s.write(&[0; 1024]).unwrap(), 1024); |
| assert_eq!(s.by_ref().write(&[0; 1024]).unwrap(), 1024); |
| } |
| |
| #[test] |
| fn empty_reads() { |
| let mut e = empty(); |
| assert_eq!(e.read(&mut []).unwrap(), 0); |
| assert_eq!(e.read(&mut [0]).unwrap(), 0); |
| assert_eq!(e.read(&mut [0; 1024]).unwrap(), 0); |
| assert_eq!(Read::by_ref(&mut e).read(&mut [0; 1024]).unwrap(), 0); |
| |
| let buf: &mut [MaybeUninit<_>] = &mut []; |
| let mut buf: BorrowedBuf<'_> = buf.into(); |
| e.read_buf(buf.unfilled()).unwrap(); |
| assert_eq!(buf.len(), 0); |
| assert_eq!(buf.init_len(), 0); |
| |
| let buf: &mut [_] = &mut [MaybeUninit::uninit()]; |
| let mut buf: BorrowedBuf<'_> = buf.into(); |
| e.read_buf(buf.unfilled()).unwrap(); |
| assert_eq!(buf.len(), 0); |
| assert_eq!(buf.init_len(), 0); |
| |
| let buf: &mut [_] = &mut [MaybeUninit::uninit(); 1024]; |
| let mut buf: BorrowedBuf<'_> = buf.into(); |
| e.read_buf(buf.unfilled()).unwrap(); |
| assert_eq!(buf.len(), 0); |
| assert_eq!(buf.init_len(), 0); |
| |
| let buf: &mut [_] = &mut [MaybeUninit::uninit(); 1024]; |
| let mut buf: BorrowedBuf<'_> = buf.into(); |
| Read::by_ref(&mut e).read_buf(buf.unfilled()).unwrap(); |
| assert_eq!(buf.len(), 0); |
| assert_eq!(buf.init_len(), 0); |
| } |
| |
| #[test] |
| fn empty_seeks() { |
| let mut e = empty(); |
| assert!(matches!(e.seek(SeekFrom::Start(0)), Ok(0))); |
| assert!(matches!(e.seek(SeekFrom::Start(1)), Ok(0))); |
| assert!(matches!(e.seek(SeekFrom::Start(u64::MAX)), Ok(0))); |
| |
| assert!(matches!(e.seek(SeekFrom::End(i64::MIN)), Ok(0))); |
| assert!(matches!(e.seek(SeekFrom::End(-1)), Ok(0))); |
| assert!(matches!(e.seek(SeekFrom::End(0)), Ok(0))); |
| assert!(matches!(e.seek(SeekFrom::End(1)), Ok(0))); |
| assert!(matches!(e.seek(SeekFrom::End(i64::MAX)), Ok(0))); |
| |
| assert!(matches!(e.seek(SeekFrom::Current(i64::MIN)), Ok(0))); |
| assert!(matches!(e.seek(SeekFrom::Current(-1)), Ok(0))); |
| assert!(matches!(e.seek(SeekFrom::Current(0)), Ok(0))); |
| assert!(matches!(e.seek(SeekFrom::Current(1)), Ok(0))); |
| assert!(matches!(e.seek(SeekFrom::Current(i64::MAX)), Ok(0))); |
| } |
| |
| #[test] |
| fn empty_sinks() { |
| let mut e = empty(); |
| assert_eq!(e.write(&[]).unwrap(), 0); |
| assert_eq!(e.write(&[0]).unwrap(), 1); |
| assert_eq!(e.write(&[0; 1024]).unwrap(), 1024); |
| assert_eq!(Write::by_ref(&mut e).write(&[0; 1024]).unwrap(), 1024); |
| } |
| |
| #[test] |
| fn repeat_repeats() { |
| let mut r = repeat(4); |
| let mut b = [0; 1024]; |
| assert_eq!(r.read(&mut b).unwrap(), 1024); |
| assert!(b.iter().all(|b| *b == 4)); |
| } |
| |
| #[test] |
| fn take_some_bytes() { |
| assert_eq!(repeat(4).take(100).bytes().count(), 100); |
| assert_eq!(repeat(4).take(100).bytes().next().unwrap().unwrap(), 4); |
| assert_eq!(repeat(1).take(10).chain(repeat(2).take(10)).bytes().count(), 20); |
| } |
| |
| #[allow(dead_code)] |
| fn const_utils() { |
| const _: Empty = empty(); |
| const _: Repeat = repeat(b'c'); |
| const _: Sink = sink(); |
| } |