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package pack
import (
"bytes"
"crypto/sha1"
"encoding/binary"
"io"
"testing"
"github.com/stretchr/testify/assert"
)
func TestDecodeIndexV2(t *testing.T) {
buf := make([]byte, 0, indexV2Width+indexFanoutWidth)
buf = append(buf, 0xff, 0x74, 0x4f, 0x63)
buf = append(buf, 0x0, 0x0, 0x0, 0x2)
for i := 0; i < indexFanoutEntries; i++ {
x := make([]byte, 4)
binary.BigEndian.PutUint32(x, uint32(3))
buf = append(buf, x...)
}
idx, err := DecodeIndex(bytes.NewReader(buf), sha1.New())
assert.NoError(t, err)
assert.EqualValues(t, 3, idx.Count())
}
func TestDecodeIndexV2InvalidFanout(t *testing.T) {
buf := make([]byte, 0, indexV2Width+indexFanoutWidth-indexFanoutEntryWidth)
buf = append(buf, 0xff, 0x74, 0x4f, 0x63)
buf = append(buf, 0x0, 0x0, 0x0, 0x2)
buf = append(buf, make([]byte, indexFanoutWidth-1)...)
idx, err := DecodeIndex(bytes.NewReader(buf), sha1.New())
assert.Equal(t, ErrShortFanout, err)
assert.Nil(t, idx)
}
func TestDecodeIndexV1(t *testing.T) {
idx, err := DecodeIndex(bytes.NewReader(make([]byte, indexFanoutWidth)), sha1.New())
assert.NoError(t, err)
assert.EqualValues(t, 0, idx.Count())
}
func TestDecodeIndexV1InvalidFanout(t *testing.T) {
idx, err := DecodeIndex(bytes.NewReader(make([]byte, indexFanoutWidth-1)), sha1.New())
assert.Equal(t, ErrShortFanout, err)
assert.Nil(t, idx)
}
func TestDecodeIndexUnsupportedVersion(t *testing.T) {
buf := make([]byte, 0, 4+4)
buf = append(buf, 0xff, 0x74, 0x4f, 0x63)
buf = append(buf, 0x0, 0x0, 0x0, 0x3)
idx, err := DecodeIndex(bytes.NewReader(buf), sha1.New())
assert.EqualError(t, err, "gitobj/pack: unsupported version: 3")
assert.Nil(t, idx)
}
func TestDecodeIndexEmptyContents(t *testing.T) {
idx, err := DecodeIndex(bytes.NewReader(make([]byte, 0)), sha1.New())
assert.Equal(t, io.EOF, err)
assert.Nil(t, idx)
}
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