restic/internal/pack/pack_internal_test.go

47 lines
1.2 KiB
Go

package pack
import (
"bytes"
"encoding/binary"
"io"
"testing"
"github.com/restic/restic/internal/crypto"
rtest "github.com/restic/restic/internal/test"
)
type countingReaderAt struct {
delegate io.ReaderAt
invocationCount int
}
func (rd *countingReaderAt) ReadAt(p []byte, off int64) (n int, err error) {
rd.invocationCount++
return rd.delegate.ReadAt(p, off)
}
func TestReadHeaderEagerLoad(t *testing.T) {
testReadHeader := func(entryCount uint, expectedReadInvocationCount int) {
expectedHeader := rtest.Random(0, int(entryCount*entrySize)+crypto.Extension)
buf := &bytes.Buffer{}
buf.Write(rtest.Random(0, 100)) // pack blobs data
buf.Write(expectedHeader) // pack header
binary.Write(buf, binary.LittleEndian, uint32(len(expectedHeader))) // pack header length
rd := &countingReaderAt{delegate: bytes.NewReader(buf.Bytes())}
header, err := readHeader(rd, int64(buf.Len()))
rtest.OK(t, err)
rtest.Equals(t, expectedHeader, header)
rtest.Equals(t, expectedReadInvocationCount, rd.invocationCount)
}
testReadHeader(1, 1)
testReadHeader(eagerEntries-1, 1)
testReadHeader(eagerEntries, 1)
testReadHeader(eagerEntries+1, 2)
}