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extern crate podio;
use std::io::{self, Read};
use podio::ReadPodExt;
struct TestReader {
state: Option<io::Result<usize>>,
}
impl TestReader {
fn new(first_return: io::Result<usize>) -> TestReader {
TestReader { state: Some(first_return) }
}
fn get(&mut self) -> io::Result<u32> {
self.read_u32::<podio::LittleEndian>()
}
fn test(first_return: io::Result<usize>) -> io::Result<u32> {
TestReader::new(first_return).get()
}
}
impl Read for TestReader {
fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
match self.state.take().unwrap_or(Ok(1)) {
Ok(n) => {
for i in buf.iter_mut().take(n) {
*i = 0xA5;
}
Ok(n)
},
e @ Err(..) => e,
}
}
}
#[test]
fn interrupted() {
// Getting an io::ErrorKind::Interrupted should be retried, and thus succeed
let first_read = Err(io::Error::new(io::ErrorKind::Interrupted, "Interrupted"));
assert_eq!(TestReader::test(first_read).unwrap(), 0xA5A5A5A5);
}
#[test]
fn eof() {
// Getting a Ok(0) implies an unexpected EOF
let first_read = Ok(0);
assert!(TestReader::test(first_read).is_err());
}
#[test]
fn err() {
// Getting any other error is still an error
let first_read = Err(io::Error::new(io::ErrorKind::Other, "Other"));
assert!(TestReader::test(first_read).is_err());
}
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