def test_check_when_is_symlink(self):
# prepare
import subprocess
topdir = Path("sandbox").join("trash-dir")
topdir.mkdir()
assert subprocess.call(["chmod", "+t", topdir.path]) == 0
topdir_link = Path("sandbox/trash-dir-link")
topdir_link.write_link("./trash-dir")
volume = Volume(Path("/mnt/disk"), True)
instance = Method1VolumeTrashDirectory(topdir_link.join("123"), volume)
instance.check()