fixture_compatibility_test.go RawHistoryFolder

1package vt_test
2
3import (
4	"bytes"
5	"embed"
6	"encoding/binary"
7	"encoding/hex"
8	"hash/crc32"
9	"strings"
10	"testing"
11)
12
13//go:embed testdata/vevs-v4-restore.golden.hex
14var fixtures embed.FS
15
16func TestVEVSV4FixtureIsDeterministic(t *testing.T) {
17	encoded, err := fixtures.ReadFile("testdata/vevs-v4-restore.golden.hex")
18	if err != nil {
19		t.Fatal(err)
20	}
21	data, err := hex.DecodeString(strings.TrimSpace(string(encoded)))
22	if err != nil {
23		t.Fatalf("decode fixture: %v", err)
24	}
25	if len(data) < 16 || !bytes.Equal(data[:4], []byte("VEVS")) {
26		t.Fatalf("fixture header = %x, want VEVS", data[:min(len(data), 4)])
27	}
28	if version := binary.BigEndian.Uint16(data[4:6]); version != 4 {
29		t.Fatalf("fixture version = %d, want 4", version)
30	}
31	if bodyLength := binary.BigEndian.Uint32(data[8:12]); int(bodyLength) != len(data)-16 {
32		t.Fatalf("fixture body length = %d, want %d", bodyLength, len(data)-16)
33	}
34	if got := binary.BigEndian.Uint32(data[12:16]); got != crc32.ChecksumIEEE(data[16:]) {
35		t.Fatalf("fixture CRC = %#x, want %#x", got, crc32.ChecksumIEEE(data[16:]))
36	}
37	if got := bytes.Count(data, []byte("VTH1")); got != 3 {
38		t.Fatalf("embedded VTH3 marker count = %d, want 3", got)
39	}
40}
41
42func min(a, b int) int {
43	if a < b {
44		return a
45	}
46	return b
47}