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18 lines
499 B
18 lines
499 B
4 months ago
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#[test]
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fn read_exact() {
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use futures::executor::block_on;
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use futures::io::AsyncReadExt;
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let mut reader: &[u8] = &[1, 2, 3, 4, 5];
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let mut out = [0u8; 3];
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let res = block_on(reader.read_exact(&mut out)); // read 3 bytes out
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assert!(res.is_ok());
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assert_eq!(out, [1,2,3]);
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assert_eq!(reader.len(), 2);
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let res = block_on(reader.read_exact(&mut out)); // read another 3 bytes, but only 2 bytes left
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assert!(res.is_err());
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assert_eq!(reader.len(), 0);
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}
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