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82 lines
2.2 KiB
82 lines
2.2 KiB
mod mock_reader {
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use futures::io::AsyncRead;
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use std::io;
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use std::pin::Pin;
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use std::task::{Context, Poll};
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pub struct MockReader {
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fun: Box<dyn FnMut(&mut [u8]) -> Poll<io::Result<usize>>>,
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}
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impl MockReader {
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pub fn new(fun: impl FnMut(&mut [u8]) -> Poll<io::Result<usize>> + 'static) -> Self {
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Self { fun: Box::new(fun) }
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}
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}
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impl AsyncRead for MockReader {
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fn poll_read(
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self: Pin<&mut Self>,
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_cx: &mut Context<'_>,
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buf: &mut [u8]
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) -> Poll<io::Result<usize>> {
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(self.get_mut().fun)(buf)
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}
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}
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}
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/// Verifies that the default implementation of `poll_read_vectored`
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/// calls `poll_read` with an empty slice if no buffers are provided.
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#[test]
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fn read_vectored_no_buffers() {
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use futures::io::AsyncRead;
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use futures_test::task::panic_context;
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use std::io;
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use std::pin::Pin;
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use std::task::Poll;
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use mock_reader::MockReader;
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let mut reader = MockReader::new(|buf| {
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assert_eq!(buf, b"");
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Err(io::ErrorKind::BrokenPipe.into()).into()
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});
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let cx = &mut panic_context();
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let bufs = &mut [];
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let res = Pin::new(&mut reader).poll_read_vectored(cx, bufs);
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let res = res.map_err(|e| e.kind());
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assert_eq!(res, Poll::Ready(Err(io::ErrorKind::BrokenPipe)))
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}
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/// Verifies that the default implementation of `poll_read_vectored`
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/// calls `poll_read` with the first non-empty buffer.
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#[test]
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fn read_vectored_first_non_empty() {
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use futures::io::AsyncRead;
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use futures_test::task::panic_context;
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use std::io;
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use std::pin::Pin;
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use std::task::Poll;
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use mock_reader::MockReader;
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let mut reader = MockReader::new(|buf| {
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assert_eq!(buf.len(), 4);
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buf.copy_from_slice(b"four");
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Poll::Ready(Ok(4))
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});
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let cx = &mut panic_context();
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let mut buf = [0; 4];
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let bufs = &mut [
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io::IoSliceMut::new(&mut []),
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io::IoSliceMut::new(&mut []),
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io::IoSliceMut::new(&mut buf),
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];
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let res = Pin::new(&mut reader).poll_read_vectored(cx, bufs);
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let res = res.map_err(|e| e.kind());
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assert_eq!(res, Poll::Ready(Ok(4)));
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assert_eq!(buf, b"four"[..]);
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}
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