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package sideband64k_test
import (
"bytes"
"errors"
"testing"
"codeberg.org/lindenii/furgit/network/protocol/sideband64k"
)
func TestAppendBandPreservesDstOnError(t *testing.T) {
t.Parallel()
orig := []byte("seed")
dst := append([]byte(nil), orig...)
out, err := sideband64k.AppendBand(dst, 4, []byte("x"))
if !errors.Is(err, sideband64k.ErrInvalidBand) {
t.Fatalf("got err %v, want ErrInvalidBand", err)
}
if !bytes.Equal(out, orig) {
t.Fatalf("got %q, want %q", string(out), string(orig))
}
out, err = sideband64k.AppendData(dst, bytes.Repeat([]byte{'x'}, sideband64k.DataMax+1))
if !errors.Is(err, sideband64k.ErrTooLarge) {
t.Fatalf("got err %v, want ErrTooLarge", err)
}
if !bytes.Equal(out, orig) {
t.Fatalf("got %q, want %q", string(out), string(orig))
}
}
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