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package furgit
import (
"bytes"
"testing"
"codeberg.org/lindenii/furgit/internal/bufpool"
)
func TestDeltaEncodeApplyRoundtrip(t *testing.T) {
base := []byte("Hello, world!")
target := []byte("Hello, brave new world!")
instr := []deltaInstruction{
{copy: true, offset: 0, length: 7},
{copy: false, data: []byte("brave new "), length: len("brave new ")},
{copy: true, offset: 7, length: 6},
}
delta, err := deltaEncode(len(base), len(target), instr)
if err != nil {
t.Fatalf("deltaEncode error: %v", err)
}
out, err := packDeltaApply(bufpool.FromOwned(base), bufpool.FromOwned(delta))
if err != nil {
t.Fatalf("packDeltaApply error: %v", err)
}
defer out.Release()
if !bytes.Equal(out.Bytes(), target) {
t.Fatalf("delta apply mismatch: got %q, want %q", out.Bytes(), target)
}
}
func TestDeltifyRoundtrip(t *testing.T) {
base := []byte("The quick brown fox jumps over the lazy dog.")
target := []byte("The quick red fox jumps over the very lazy dog.")
instr, err := deltify(base, target, 0)
if err != nil {
t.Fatalf("deltify error: %v", err)
}
delta, err := deltaEncode(len(base), len(target), instr)
if err != nil {
t.Fatalf("deltaEncode error: %v", err)
}
out, err := packDeltaApply(bufpool.FromOwned(base), bufpool.FromOwned(delta))
if err != nil {
t.Fatalf("packDeltaApply error: %v", err)
}
defer out.Release()
if !bytes.Equal(out.Bytes(), target) {
t.Fatalf("delta apply mismatch: got %q, want %q", out.Bytes(), target)
}
}
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