tokio-test/tests/io.rs


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#![warn(rust_2018_idioms)]

use tokio::io::{AsyncReadExt, AsyncWriteExt};
use tokio_test::io::Builder;

#[tokio::test]
async fn read() {
    let mut mock = Builder::new().read(b"hello ").read(b"world!").build();

    let mut buf = [0; 256];

    let n = mock.read(&mut buf).await.expect("read 1");
    assert_eq!(&buf[..n], b"hello ");

    let n = mock.read(&mut buf).await.expect("read 2");
    assert_eq!(&buf[..n], b"world!");
}

#[tokio::test]
async fn write() {
    let mut mock = Builder::new().write(b"hello ").write(b"world!").build();

    mock.write_all(b"hello ").await.expect("write 1");
    mock.write_all(b"world!").await.expect("write 2");
}