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87 lines
2.3 KiB
87 lines
2.3 KiB
mod mock_writer {
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use futures::io::AsyncWrite;
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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 MockWriter {
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fun: Box<dyn FnMut(&[u8]) -> Poll<io::Result<usize>>>,
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}
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impl MockWriter {
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pub fn new(fun: impl FnMut(&[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 AsyncWrite for MockWriter {
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fn poll_write(
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self: Pin<&mut Self>,
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_cx: &mut Context<'_>,
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buf: &[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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fn poll_flush(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll<io::Result<()>> {
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panic!()
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}
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fn poll_close(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll<io::Result<()>> {
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panic!()
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}
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}
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}
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/// Verifies that the default implementation of `poll_write_vectored`
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/// calls `poll_write` with an empty slice if no buffers are provided.
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#[test]
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fn write_vectored_no_buffers() {
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use futures::io::AsyncWrite;
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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_writer::MockWriter;
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let mut writer = MockWriter::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 writer).poll_write_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_write_vectored`
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/// calls `poll_write` with the first non-empty buffer.
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#[test]
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fn write_vectored_first_non_empty() {
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use futures::io::AsyncWrite;
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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_writer::MockWriter;
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let mut writer = MockWriter::new(|buf| {
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assert_eq!(buf, 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 bufs = &mut [
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io::IoSlice::new(&[]),
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io::IoSlice::new(&[]),
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io::IoSlice::new(b"four")
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];
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let res = Pin::new(&mut writer).poll_write_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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}
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