t.Errorf("test %d, found prefix in GNU format: %s", i, prefix)
		}

		tr := NewReader(&b)
		hdr, err := tr.Next()
		if err != nil && err != ErrInsecurePath {
			t.Errorf("test %d, unexpected Next error: %v", i, err)
		}
		if hdr.Name != name {
			t.Errorf("test %d, hdr.Name = %s, want %s", i, hdr.Name, name)
		}
	}
}

	// as well as the initialization of bigBuf.
	runOnce(&bytes.Buffer{})
	b.ResetTimer()

	b.RunParallel(func(pb *testing.PB) {
		var buf bytes.Buffer
		for pb.Next() {
			runOnce(&buf)
		}
	})
}

func writeTestsToFS(tests []WriteTest) fs.FS {
	fsys := fstest.MapFS{}
	for _, wt := range tests {
		fsys[wt.Name] = &fstest.MapFile{
			Data: wt.Data,