tokio/tests/fs_file.rs


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#![warn(rust_2018_idioms)]
#![cfg(feature = "full")]

use tokio::fs::File;
use tokio::prelude::*;

use std::io::prelude::*;
use tempfile::NamedTempFile;

const HELLO: &[u8] = b"hello world...";

#[tokio::test]
async fn basic_read() {
    let mut tempfile = tempfile();
    tempfile.write_all(HELLO).unwrap();

    let mut file = File::open(tempfile.path()).await.unwrap();

    let mut buf = [0; 1024];
    let n = file.read(&mut buf).await.unwrap();

    assert_eq!(n, HELLO.len());
    assert_eq!(&buf[..n], HELLO);
}

#[tokio::test]
async fn basic_write() {
    let tempfile = tempfile();

    let mut file = File::create(tempfile.path()).await.unwrap();

    file.write_all(HELLO).await.unwrap();
    file.flush().await.unwrap();

    let file = std::fs::read(tempfile.path()).unwrap();
    assert_eq!(file, HELLO);
}

fn tempfile() -> NamedTempFile {
    NamedTempFile::new().unwrap()
}