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v/vlib/io/io_test.v

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import io
struct Buf {
pub:
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bytes []u8
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mut:
i int
}
struct Writ {
pub mut:
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bytes []u8
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}
fn (mut b Buf) read(mut buf []u8) !int {
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if !(b.i < b.bytes.len) {
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return io.Eof{}
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}
n := copy(mut buf, b.bytes[b.i..])
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b.i += n
return n
}
fn (mut w Writ) write(buf []u8) !int {
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if buf.len <= 0 {
return error('none')
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}
w.bytes << buf
return buf.len
}
fn test_copy() {
mut src := Buf{
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bytes: 'abcdefghij'.repeat(10).bytes()
}
mut dst := Writ{
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bytes: []u8{}
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}
io.cp(mut src, mut dst) or { assert false }
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assert dst.bytes == src.bytes
}