1package main
 2
 3import (
 4	"path/filepath"
 5	"strings"
 6	"testing"
 7	"unicode/utf8"
 8)
 9
10func TestSanitizeFilenameTruncatesCJKOnUTF8Boundary(t *testing.T) {
11	name := strings.Repeat("文", 100) + ".txt"
12
13	got := sanitizeFilename(name)
14
15	if !utf8.ValidString(got) {
16		t.Fatalf("sanitizeFilename returned invalid UTF-8: %q", got)
17	}
18	if len(got) > 255 {
19		t.Fatalf("sanitizeFilename returned %d bytes, want at most 255", len(got))
20	}
21	if filepath.Ext(got) != ".txt" {
22		t.Fatalf("sanitizeFilename lost extension: got %q", got)
23	}
24}
25
26func TestSanitizeFilenameTruncatesEmojiOnUTF8Boundary(t *testing.T) {
27	name := strings.Repeat("🚀", 80) + ".log"
28
29	got := sanitizeFilename(name)
30
31	if !utf8.ValidString(got) {
32		t.Fatalf("sanitizeFilename returned invalid UTF-8: %q", got)
33	}
34	if len(got) > 255 {
35		t.Fatalf("sanitizeFilename returned %d bytes, want at most 255", len(got))
36	}
37	if filepath.Ext(got) != ".log" {
38		t.Fatalf("sanitizeFilename lost extension: got %q", got)
39	}
40}