Merge pull request '修复 hook 隔离用例把探针自身写入当成被测行为' (#523) from fix/git-hooks-index-snapshot into master

Reviewed-on: #523

scripts/git-hooks.test.mjs

@@ -277,11 +277,13 @@ test('hook fixtures do not mutate the calling linked worktree or its index', ()
     writeFileSync(join(worktree, 'sentinel.txt'), 'unstaged\n');
     const gitDir = git(worktree, 'rev-parse', '--absolute-git-dir').trim();
     const indexPath = join(gitDir, 'index');
+    // `git status` 会刷新并重写索引里的 stat 缓存（macOS 与部分 git 版本上字节必然变化），
+    // 所以先跑完会写索引的探针再取快照，否则断言的是探针自身的副作用而不是被测行为。
     const before = {
       refs: git(outerRepo, 'show-ref'),
       config: readFileSync(join(outerRepo, '.git', 'config'), 'utf8'),
-      index: readFileSync(indexPath),
       status: git(worktree, 'status', '--porcelain'),
+      index: readFileSync(indexPath),
     };
     const result = spawnSync(
       process.execPath,