old_contents: from __future__ import print_function
  import sys
  import os
  import pytest
  sys.path.append('./')
  
  from fileprocess.dirlist import DirList
  
  
  class TestClass(object):
      def test_DirList(self):
          curdir = os.path.split(os.path.realpath(__file__))[0]
          tmp = DirList(curdir)
  
      def test_err_DirList(self):
          with pytest.raises(Exception):
              tmp = DirList('')
  
      def test__listdir(self):
          with pytest.raises(Exception):
              tmp = DirList(None)
  
      def test__listdir_exclude_dir(self):
          curdir = os.path.split(os.path.realpath(__file__))[0]
          tmp = DirList(curdir, excludedir=curdir)
          assert tmp.dirlist == {}
  
      def test_getattr(self):
          assert DirList.getattr(__file__) == 'FILE'
          assert DirList.getattr(os.path.split(os.path.realpath(__file__))[0]) == 'DIR'
          assert DirList.getattr('/dev/ttyxxxx')
          os.system('ln -sf ' + __file__ + ' xxtestlnk')
          assert DirList.getattr('xxtestlnk') == "LINK"
          os.system('rm -rf xxtestlnk')
  
      def test_shadow_key(self):
          assert DirList.shadow_key('123') == b'fKHdCVgwViFR1Cj7ANzZtlrO1zzGZLwK9eKQmM3eXes='
          assert DirList.shadow_key(b'123') == b'fKHdCVgwViFR1Cj7ANzZtlrO1zzGZLwK9eKQmM3eXes='
          assert DirList.shadow_key(123) == None
  
      def test_enc_bytes(self):
          pwd_bytes = DirList.enc_bytes('123', b'123')
          assert DirList.dec_bytes('123', pwd_bytes) == b'123'
  
      def test_serial(self):
          pwd = '123'
          filename = 'test.test'
          curdir = os.path.split(os.path.realpath(__file__))[0]
          filename = curdir + '/' + filename
          tmp = DirList(curdir)
          tmp.serial(pwd, filename)
          assert os.path.isfile(filename)
          os.system('rm -rf ' + filename)
  
      def test_unserail(self):
          pwd = '123'
          filename = 'test.test'
          curdir = os.path.split(os.path.realpath(__file__))[0]
          filename = curdir + '/' + filename
          tmp = DirList(curdir)
          tmp.serial(pwd, filename)
          tmp1 = DirList.unserial(pwd, filename)
          os.system('rm -rf ' + filename)
  
new_contents: from __future__ import print_function
  import sys
  import os
  import pytest
  sys.path.append('./')
  
  from fileprocess.dirlist import DirList
  
  
  class TestClass(object):
      def test_DirList(self):
          curdir = os.path.split(os.path.realpath(__file__))[0]
          tmp = DirList(curdir)
  
      def test_err_DirList(self):
          with pytest.raises(Exception):
              tmp = DirList('')
  
      def test__listdir(self):
          with pytest.raises(Exception):
              tmp = DirList(None)
  
      def test__listdir_exclude_dir(self):
          curdir = os.path.split(os.path.realpath(__file__))[0]
          tmp = DirList(curdir, excludedir=curdir)
          assert tmp.dirlist == {}
  
      def test_getattr(self):
          assert DirList.getattr(__file__) == 'FILE'
          assert DirList.getattr(os.path.split(os.path.realpath(__file__))[0]) == 'DIR'
          assert DirList.getattr('/dev/ttyxxxx')
          os.system('ln -sf ' + __file__ + ' xxtestlnk')
          assert DirList.getattr('xxtestlnk') == "LINK"
          os.system('rm -rf xxtestlnk')
  
      def test_shadow_key(self):
          assert DirList.shadow_key('123') == b'fKHdCVgwViFR1Cj7ANzZtlrO1zzGZLwK9eKQmM3eXes='
          assert DirList.shadow_key(b'123') == b'fKHdCVgwViFR1Cj7ANzZtlrO1zzGZLwK9eKQmM3eXes='
          assert DirList.shadow_key(123) == None
  
      def test_enc_bytes(self):
          pwd_bytes = DirList.enc_bytes('123', b'123')
          assert DirList.dec_bytes('123', pwd_bytes) == b'123'
  
      def test_serial(self):
          pwd = '123'
          filename = 'test.test'
          curdir = os.path.split(os.path.realpath(__file__))[0]
          filename = curdir + '/' + filename
          tmp = DirList(curdir)
          tmp.serial(pwd, filename)
          assert os.path.isfile(filename)
          os.system('rm -rf ' + filename)
  
      def test_unserail(self):
          pwd = '123'
          filename = 'test.test'
          curdir = os.path.split(os.path.realpath(__file__))[0]
          filename = curdir + '/' + filename
          tmp = DirList(curdir)
          tmp.serial(pwd, filename)
          tmp1 = DirList.unserial(pwd, filename)
          assert type(tmp1) is DirList
          os.system('rm -rf ' + filename)
  
subject: update unserial test case