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use futures::executor::block_on;
use futures::future::{Future, FutureExt};
use futures::stream::{self, StreamExt, TryStreamExt};
use futures::io::{AsyncBufReadExt, Cursor};
use futures::task::Poll;
use futures_test::io::AsyncReadTestExt;
use futures_test::task::noop_context;
#[test]
fn read_line() {
let mut buf = Cursor::new(b"12");
let mut v = String::new();
assert_eq!(block_on(buf.read_line(&mut v)).unwrap(), 2);
assert_eq!(v, "12");
let mut buf = Cursor::new(b"12\n\n");
let mut v = String::new();
assert_eq!(block_on(buf.read_line(&mut v)).unwrap(), 3);
assert_eq!(v, "12\n");
v.clear();
assert_eq!(block_on(buf.read_line(&mut v)).unwrap(), 1);
assert_eq!(v, "\n");
v.clear();
assert_eq!(block_on(buf.read_line(&mut v)).unwrap(), 0);
assert_eq!(v, "");
}
fn run<F: Future + Unpin>(mut f: F) -> F::Output {
let mut cx = noop_context();
loop {
if let Poll::Ready(x) = f.poll_unpin(&mut cx) {
return x;
}
}
}
#[test]
fn maybe_pending() {
let mut buf = b"12".interleave_pending();
let mut v = String::new();
assert_eq!(run(buf.read_line(&mut v)).unwrap(), 2);
assert_eq!(v, "12");
let mut buf = stream::iter(vec![&b"12"[..], &b"\n\n"[..]])
.map(Ok)
.into_async_read()
.interleave_pending();
let mut v = String::new();
assert_eq!(run(buf.read_line(&mut v)).unwrap(), 3);
assert_eq!(v, "12\n");
v.clear();
assert_eq!(run(buf.read_line(&mut v)).unwrap(), 1);
assert_eq!(v, "\n");
v.clear();
assert_eq!(run(buf.read_line(&mut v)).unwrap(), 0);
assert_eq!(v, "");
v.clear();
assert_eq!(run(buf.read_line(&mut v)).unwrap(), 0);
assert_eq!(v, "");
}
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