1 use core::pin::Pin;
2 use futures::io::{AsyncBufRead, AsyncRead};
3 use futures::stream::{self, TryStreamExt};
4 use futures::task::Poll;
5 use futures_test::{stream::StreamTestExt, task::noop_context};
6
7 macro_rules! assert_read {
8 ($reader:expr, $buf:expr, $item:expr) => {
9 let mut cx = noop_context();
10 loop {
11 match Pin::new(&mut $reader).poll_read(&mut cx, $buf) {
12 Poll::Ready(Ok(x)) => {
13 assert_eq!(x, $item);
14 break;
15 }
16 Poll::Ready(Err(err)) => {
17 panic!("assertion failed: expected value but got {}", err);
18 }
19 Poll::Pending => {
20 continue;
21 }
22 }
23 }
24 };
25 }
26
27 macro_rules! assert_fill_buf {
28 ($reader:expr, $buf:expr) => {
29 let mut cx = noop_context();
30 loop {
31 match Pin::new(&mut $reader).poll_fill_buf(&mut cx) {
32 Poll::Ready(Ok(x)) => {
33 assert_eq!(x, $buf);
34 break;
35 }
36 Poll::Ready(Err(err)) => {
37 panic!("assertion failed: expected value but got {}", err);
38 }
39 Poll::Pending => {
40 continue;
41 }
42 }
43 }
44 };
45 }
46
47 #[test]
test_into_async_read()48 fn test_into_async_read() {
49 let stream = stream::iter((1..=3).flat_map(|_| vec![Ok(vec![]), Ok(vec![1, 2, 3, 4, 5])]));
50 let mut reader = stream.interleave_pending().into_async_read();
51 let mut buf = vec![0; 3];
52
53 assert_read!(reader, &mut buf, 3);
54 assert_eq!(&buf, &[1, 2, 3]);
55
56 assert_read!(reader, &mut buf, 2);
57 assert_eq!(&buf[..2], &[4, 5]);
58
59 assert_read!(reader, &mut buf, 3);
60 assert_eq!(&buf, &[1, 2, 3]);
61
62 assert_read!(reader, &mut buf, 2);
63 assert_eq!(&buf[..2], &[4, 5]);
64
65 assert_read!(reader, &mut buf, 3);
66 assert_eq!(&buf, &[1, 2, 3]);
67
68 assert_read!(reader, &mut buf, 2);
69 assert_eq!(&buf[..2], &[4, 5]);
70
71 assert_read!(reader, &mut buf, 0);
72 }
73
74 #[test]
test_into_async_bufread()75 fn test_into_async_bufread() {
76 let stream = stream::iter((1..=2).flat_map(|_| vec![Ok(vec![]), Ok(vec![1, 2, 3, 4, 5])]));
77 let mut reader = stream.interleave_pending().into_async_read();
78
79 let mut reader = Pin::new(&mut reader);
80
81 assert_fill_buf!(reader, &[1, 2, 3, 4, 5][..]);
82 reader.as_mut().consume(3);
83
84 assert_fill_buf!(reader, &[4, 5][..]);
85 reader.as_mut().consume(2);
86
87 assert_fill_buf!(reader, &[1, 2, 3, 4, 5][..]);
88 reader.as_mut().consume(2);
89
90 assert_fill_buf!(reader, &[3, 4, 5][..]);
91 reader.as_mut().consume(3);
92
93 assert_fill_buf!(reader, &[][..]);
94 }
95