Commit dfdf56c

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Test that file EOF is not permanent: reading again should give new data

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Original file line number	Diff line number	Diff line change
`@@ -918,4 +918,40 @@ mod tests {`
`918`	`918`	`assert_eq!(format!("{}", expect), format!("{}", actual));`
`919`	`919`	`})`
`920`	`920`	`}`
	`921`	`+`
	`922`	`+ #[test]`
	`923`	`+ fn file_eof_is_not_permanent() -> crate::io::Result<()> {`
	`924`	`+ let tempdir = tempfile::Builder::new()`
	`925`	`+ .prefix("async-std-file-eof-test")`
	`926`	`+ .tempdir()?;`
	`927`	`+ let path = tempdir.path().join("testfile");`
	`928`	`+`
	`929`	`+ crate::task::block_on(async {`
	`930`	`+ let mut file_w = File::create(&path).await?;`
	`931`	`+ let mut file_r = File::open(&path).await?;`
	`932`	`+`
	`933`	`+ file_w.write_all(b"data").await?;`
	`934`	`+ file_w.flush().await?;`
	`935`	`+`
	`936`	`+ let mut buf = [0u8; 4];`
	`937`	`+ let mut len = file_r.read(&mut buf).await?;`
	`938`	`+ assert_eq!(len, 4);`
	`939`	`+ assert_eq!(&buf, b"data");`
	`940`	`+`
	`941`	`+ len = file_r.read(&mut buf).await?;`
	`942`	`+ assert_eq!(len, 0);`
	`943`	`+`
	`944`	`+ file_w.write_all(b"more").await?;`
	`945`	`+ file_w.flush().await?;`
	`946`	`+`
	`947`	`+ len = file_r.read(&mut buf).await?;`
	`948`	`+ assert_eq!(len, 4);`
	`949`	`+ assert_eq!(&buf, b"more");`
	`950`	`+`
	`951`	`+ len = file_r.read(&mut buf).await?;`
	`952`	`+ assert_eq!(len, 0);`
	`953`	`+`
	`954`	`+ Ok(())`
	`955`	`+ })`
	`956`	`+ }`
`921`	`957`	`}`

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