text: import ntpath
  import os
  import sys
  import unittest
  import warnings
  from test.support import os_helper
  from test.support import TestFailed
  from test.support.os_helper import FakePath
  from test import test_genericpath
  from tempfile import TemporaryFile
  
  
  try:
      import nt
  except ImportError:
      # Most tests can complete without the nt module,
      # but for those that require it we import here.
      nt = None
  
  try:
      ntpath._getfinalpathname
  except AttributeError:
      HAVE_GETFINALPATHNAME = False
  else:
      HAVE_GETFINALPATHNAME = True
  
  try:
      import ctypes
  except ImportError:
      HAVE_GETSHORTPATHNAME = False
  else:
      HAVE_GETSHORTPATHNAME = True
      def _getshortpathname(path):
          GSPN = ctypes.WinDLL("kernel32", use_last_error=True).GetShortPathNameW
          GSPN.argtypes = [ctypes.c_wchar_p, ctypes.c_wchar_p, ctypes.c_uint32]
          GSPN.restype = ctypes.c_uint32
          result_len = GSPN(path, None, 0)
          if not result_len:
              raise OSError("failed to get short path name 0x{:08X}"
                            .format(ctypes.get_last_error()))
          result = ctypes.create_unicode_buffer(result_len)
          result_len = GSPN(path, result, result_len)
          return result[:result_len]
  
  def _norm(path):
      if isinstance(path, (bytes, str, os.PathLike)):
          return ntpath.normcase(os.fsdecode(path))
      elif hasattr(path, "__iter__"):
          return tuple(ntpath.normcase(os.fsdecode(p)) for p in path)
      return path
  
  
  def tester(fn, wantResult):
      fn = fn.replace("\\", "\\\\")
      gotResult = eval(fn)
      if wantResult != gotResult and _norm(wantResult) != _norm(gotResult):
          raise TestFailed("%s should return: %s but returned: %s" \
                %(str(fn), str(wantResult), str(gotResult)))
  
      # then with bytes
      fn = fn.replace("('", "(b'")
      fn = fn.replace('("', '(b"')
      fn = fn.replace("['", "[b'")
      fn = fn.replace('["', '[b"')
      fn = fn.replace(", '", ", b'")
      fn = fn.replace(', "', ', b"')
      fn = os.fsencode(fn).decode('latin1')
      fn = fn.encode('ascii', 'backslashreplace').decode('ascii')
      with warnings.catch_warnings():
          warnings.simplefilter("ignore", DeprecationWarning)
          gotResult = eval(fn)
      if _norm(wantResult) != _norm(gotResult):
          raise TestFailed("%s should return: %s but returned: %s" \
                %(str(fn), str(wantResult), repr(gotResult)))
  
  
  class NtpathTestCase(unittest.TestCase):
      def assertPathEqual(self, path1, path2):
          if path1 == path2 or _norm(path1) == _norm(path2):
              return
          self.assertEqual(path1, path2)
  
      def assertPathIn(self, path, pathset):
          self.assertIn(_norm(path), _norm(pathset))
  
  
  class TestNtpath(NtpathTestCase):
      def test_splitext(self):
          tester('ntpath.splitext("foo.ext")', ('foo', '.ext'))
          tester('ntpath.splitext("/foo/foo.ext")', ('/foo/foo', '.ext'))
          tester('ntpath.splitext(".ext")', ('.ext', ''))
          tester('ntpath.splitext("\\foo.ext\\foo")', ('\\foo.ext\\foo', ''))
          tester('ntpath.splitext("foo.ext\\")', ('foo.ext\\', ''))
          tester('ntpath.splitext("")', ('', ''))
          tester('ntpath.splitext("foo.bar.ext")', ('foo.bar', '.ext'))
          tester('ntpath.splitext("xx/foo.bar.ext")', ('xx/foo.bar', '.ext'))
          tester('ntpath.splitext("xx\\foo.bar.ext")', ('xx\\foo.bar', '.ext'))
          tester('ntpath.splitext("c:a/b\\c.d")', ('c:a/b\\c', '.d'))
  
      def test_splitdrive(self):
          tester('ntpath.splitdrive("c:\\foo\\bar")',
                 ('c:', '\\foo\\bar'))
          tester('ntpath.splitdrive("c:/foo/bar")',
                 ('c:', '/foo/bar'))
          tester('ntpath.splitdrive("\\\\conky\\mountpoint\\foo\\bar")',
                 ('\\\\conky\\mountpoint', '\\foo\\bar'))
          tester('ntpath.splitdrive("//conky/mountpoint/foo/bar")',
                 ('//conky/mountpoint', '/foo/bar'))
          tester('ntpath.splitdrive("\\\\\\conky\\mountpoint\\foo\\bar")',
              ('', '\\\\\\conky\\mountpoint\\foo\\bar'))
          tester('ntpath.splitdrive("///conky/mountpoint/foo/bar")',
              ('', '///conky/mountpoint/foo/bar'))
          tester('ntpath.splitdrive("\\\\conky\\\\mountpoint\\foo\\bar")',
                 ('', '\\\\conky\\\\mountpoint\\foo\\bar'))
          tester('ntpath.splitdrive("//conky//mountpoint/foo/bar")',
                 ('', '//conky//mountpoint/foo/bar'))
          # Issue #19911: UNC part containing U+0130
          self.assertEqual(ntpath.splitdrive('//conky/MOUNTPOİNT/foo/bar'),
                           ('//conky/MOUNTPOİNT', '/foo/bar'))
  
      def test_split(self):
          tester('ntpath.split("c:\\foo\\bar")', ('c:\\foo', 'bar'))
          tester('ntpath.split("\\\\conky\\mountpoint\\foo\\bar")',
                 ('\\\\conky\\mountpoint\\foo', 'bar'))
  
          tester('ntpath.split("c:\\")', ('c:\\', ''))
          tester('ntpath.split("\\\\conky\\mountpoint\\")',
                 ('\\\\conky\\mountpoint\\', ''))
  
          tester('ntpath.split("c:/")', ('c:/', ''))
          tester('ntpath.split("//conky/mountpoint/")', ('//conky/mountpoint/', ''))
  
      def test_isabs(self):
          tester('ntpath.isabs("c:\\")', 1)
          tester('ntpath.isabs("\\\\conky\\mountpoint\\")', 1)
          tester('ntpath.isabs("\\foo")', 1)
          tester('ntpath.isabs("\\foo\\bar")', 1)
  
      def test_commonprefix(self):
          tester('ntpath.commonprefix(["/home/swenson/spam", "/home/swen/spam"])',
                 "/home/swen")
          tester('ntpath.commonprefix(["\\home\\swen\\spam", "\\home\\swen\\eggs"])',
                 "\\home\\swen\\")
          tester('ntpath.commonprefix(["/home/swen/spam", "/home/swen/spam"])',
                 "/home/swen/spam")
  
      def test_join(self):
          tester('ntpath.join("")', '')
          tester('ntpath.join("", "", "")', '')
          tester('ntpath.join("a")', 'a')
          tester('ntpath.join("/a")', '/a')
          tester('ntpath.join("\\a")', '\\a')
          tester('ntpath.join("a:")', 'a:')
          tester('ntpath.join("a:", "\\b")', 'a:\\b')
          tester('ntpath.join("a", "\\b")', '\\b')
          tester('ntpath.join("a", "b", "c")', 'a\\b\\c')
          tester('ntpath.join("a\\", "b", "c")', 'a\\b\\c')
          tester('ntpath.join("a", "b\\", "c")', 'a\\b\\c')
          tester('ntpath.join("a", "b", "\\c")', '\\c')
          tester('ntpath.join("d:\\", "\\pleep")', 'd:\\pleep')
          tester('ntpath.join("d:\\", "a", "b")', 'd:\\a\\b')
  
          tester("ntpath.join('', 'a')", 'a')
          tester("ntpath.join('', '', '', '', 'a')", 'a')
          tester("ntpath.join('a', '')", 'a\\')
          tester("ntpath.join('a', '', '', '', '')", 'a\\')
          tester("ntpath.join('a\\', '')", 'a\\')
          tester("ntpath.join('a\\', '', '', '', '')", 'a\\')
          tester("ntpath.join('a/', '')", 'a/')
  
          tester("ntpath.join('a/b', 'x/y')", 'a/b\\x/y')
          tester("ntpath.join('/a/b', 'x/y')", '/a/b\\x/y')
          tester("ntpath.join('/a/b/', 'x/y')", '/a/b/x/y')
          tester("ntpath.join('c:', 'x/y')", 'c:x/y')
          tester("ntpath.join('c:a/b', 'x/y')", 'c:a/b\\x/y')
          tester("ntpath.join('c:a/b/', 'x/y')", 'c:a/b/x/y')
          tester("ntpath.join('c:/', 'x/y')", 'c:/x/y')
          tester("ntpath.join('c:/a/b', 'x/y')", 'c:/a/b\\x/y')
          tester("ntpath.join('c:/a/b/', 'x/y')", 'c:/a/b/x/y')
          tester("ntpath.join('//computer/share', 'x/y')", '//computer/share\\x/y')
          tester("ntpath.join('//computer/share/', 'x/y')", '//computer/share/x/y')
          tester("ntpath.join('//computer/share/a/b', 'x/y')", '//computer/share/a/b\\x/y')
  
          tester("ntpath.join('a/b', '/x/y')", '/x/y')
          tester("ntpath.join('/a/b', '/x/y')", '/x/y')
          tester("ntpath.join('c:', '/x/y')", 'c:/x/y')
          tester("ntpath.join('c:a/b', '/x/y')", 'c:/x/y')
          tester("ntpath.join('c:/', '/x/y')", 'c:/x/y')
          tester("ntpath.join('c:/a/b', '/x/y')", 'c:/x/y')
          tester("ntpath.join('//computer/share', '/x/y')", '//computer/share/x/y')
          tester("ntpath.join('//computer/share/', '/x/y')", '//computer/share/x/y')
          tester("ntpath.join('//computer/share/a', '/x/y')", '//computer/share/x/y')
  
          tester("ntpath.join('c:', 'C:x/y')", 'C:x/y')
          tester("ntpath.join('c:a/b', 'C:x/y')", 'C:a/b\\x/y')
          tester("ntpath.join('c:/', 'C:x/y')", 'C:/x/y')
          tester("ntpath.join('c:/a/b', 'C:x/y')", 'C:/a/b\\x/y')
  
          for x in ('', 'a/b', '/a/b', 'c:', 'c:a/b', 'c:/', 'c:/a/b',
                    '//computer/share', '//computer/share/', '//computer/share/a/b'):
              for y in ('d:', 'd:x/y', 'd:/', 'd:/x/y',
                        '//machine/common', '//machine/common/', '//machine/common/x/y'):
                  tester("ntpath.join(%r, %r)" % (x, y), y)
  
          tester("ntpath.join('\\\\computer\\share\\', 'a', 'b')", '\\\\computer\\share\\a\\b')
          tester("ntpath.join('\\\\computer\\share', 'a', 'b')", '\\\\computer\\share\\a\\b')
          tester("ntpath.join('\\\\computer\\share', 'a\\b')", '\\\\computer\\share\\a\\b')
          tester("ntpath.join('//computer/share/', 'a', 'b')", '//computer/share/a\\b')
          tester("ntpath.join('//computer/share', 'a', 'b')", '//computer/share\\a\\b')
          tester("ntpath.join('//computer/share', 'a/b')", '//computer/share\\a/b')
  
      def test_normpath(self):
          tester("ntpath.normpath('A//////././//.//B')", r'A\B')
          tester("ntpath.normpath('A/./B')", r'A\B')
          tester("ntpath.normpath('A/foo/../B')", r'A\B')
          tester("ntpath.normpath('C:A//B')", r'C:A\B')
          tester("ntpath.normpath('D:A/./B')", r'D:A\B')
          tester("ntpath.normpath('e:A/foo/../B')", r'e:A\B')
  
          tester("ntpath.normpath('C:///A//B')", r'C:\A\B')
          tester("ntpath.normpath('D:///A/./B')", r'D:\A\B')
          tester("ntpath.normpath('e:///A/foo/../B')", r'e:\A\B')
  
          tester("ntpath.normpath('..')", r'..')
          tester("ntpath.normpath('.')", r'.')
          tester("ntpath.normpath('')", r'.')
          tester("ntpath.normpath('/')", '\\')
          tester("ntpath.normpath('c:/')", 'c:\\')
          tester("ntpath.normpath('/../.././..')", '\\')
          tester("ntpath.normpath('c:/../../..')", 'c:\\')
          tester("ntpath.normpath('../.././..')", r'..\..\..')
          tester("ntpath.normpath('K:../.././..')", r'K:..\..\..')
          tester("ntpath.normpath('C:////a/b')", r'C:\a\b')
          tester("ntpath.normpath('//machine/share//a/b')", r'\\machine\share\a\b')
  
          tester("ntpath.normpath('\\\\.\\NUL')", r'\\.\NUL')
          tester("ntpath.normpath('\\\\?\\D:/XY\\Z')", r'\\?\D:/XY\Z')
          tester("ntpath.normpath('handbook/../../Tests/image.png')", r'..\Tests\image.png')
          tester("ntpath.normpath('handbook/../../../Tests/image.png')", r'..\..\Tests\image.png')
          tester("ntpath.normpath('handbook///../a/.././../b/c')", r'..\b\c')
          tester("ntpath.normpath('handbook/a/../..///../../b/c')", r'..\..\b\c')
  
          tester("ntpath.normpath('//server/share/..')" ,    '\\\\server\\share\\')
          tester("ntpath.normpath('//server/share/../')" ,   '\\\\server\\share\\')
          tester("ntpath.normpath('//server/share/../..')",  '\\\\server\\share\\')
          tester("ntpath.normpath('//server/share/../../')", '\\\\server\\share\\')
  
      def test_realpath_curdir(self):
          expected = ntpath.normpath(os.getcwd())
          tester("ntpath.realpath('.')", expected)
          tester("ntpath.realpath('./.')", expected)
          tester("ntpath.realpath('/'.join(['.'] * 100))", expected)
          tester("ntpath.realpath('.\\.')", expected)
          tester("ntpath.realpath('\\'.join(['.'] * 100))", expected)
  
      def test_realpath_pardir(self):
          expected = ntpath.normpath(os.getcwd())
          tester("ntpath.realpath('..')", ntpath.dirname(expected))
          tester("ntpath.realpath('../..')",
                 ntpath.dirname(ntpath.dirname(expected)))
          tester("ntpath.realpath('/'.join(['..'] * 50))",
                 ntpath.splitdrive(expected)[0] + '\\')
          tester("ntpath.realpath('..\\..')",
                 ntpath.dirname(ntpath.dirname(expected)))
          tester("ntpath.realpath('\\'.join(['..'] * 50))",
                 ntpath.splitdrive(expected)[0] + '\\')
  
      @os_helper.skip_unless_symlink
      @unittest.skipUnless(HAVE_GETFINALPATHNAME, 'need _getfinalpathname')
      def test_realpath_basic(self):
          ABSTFN = ntpath.abspath(os_helper.TESTFN)
          open(ABSTFN, "wb").close()
          self.addCleanup(os_helper.unlink, ABSTFN)
          self.addCleanup(os_helper.unlink, ABSTFN + "1")
  
          os.symlink(ABSTFN, ABSTFN + "1")
          self.assertPathEqual(ntpath.realpath(ABSTFN + "1"), ABSTFN)
          self.assertPathEqual(ntpath.realpath(os.fsencode(ABSTFN + "1")),
                           os.fsencode(ABSTFN))
  
      @os_helper.skip_unless_symlink
      @unittest.skipUnless(HAVE_GETFINALPATHNAME, 'need _getfinalpathname')
      def test_realpath_strict(self):
          # Bug #43757: raise FileNotFoundError in strict mode if we encounter
          # a path that does not exist.
          ABSTFN = ntpath.abspath(os_helper.TESTFN)
          os.symlink(ABSTFN + "1", ABSTFN)
          self.addCleanup(os_helper.unlink, ABSTFN)
          self.assertRaises(FileNotFoundError, ntpath.realpath, ABSTFN, strict=True)
          self.assertRaises(FileNotFoundError, ntpath.realpath, ABSTFN + "2", strict=True)
  
      @os_helper.skip_unless_symlink
      @unittest.skipUnless(HAVE_GETFINALPATHNAME, 'need _getfinalpathname')
      def test_realpath_relative(self):
          ABSTFN = ntpath.abspath(os_helper.TESTFN)
          open(ABSTFN, "wb").close()
          self.addCleanup(os_helper.unlink, ABSTFN)
          self.addCleanup(os_helper.unlink, ABSTFN + "1")
  
          os.symlink(ABSTFN, ntpath.relpath(ABSTFN + "1"))
          self.assertPathEqual(ntpath.realpath(ABSTFN + "1"), ABSTFN)
  
      @os_helper.skip_unless_symlink
      @unittest.skipUnless(HAVE_GETFINALPATHNAME, 'need _getfinalpathname')
      def test_realpath_broken_symlinks(self):
          ABSTFN = ntpath.abspath(os_helper.TESTFN)
          os.mkdir(ABSTFN)
          self.addCleanup(os_helper.rmtree, ABSTFN)
  
          with os_helper.change_cwd(ABSTFN):
              os.mkdir("subdir")
              os.chdir("subdir")
              os.symlink(".", "recursive")
              os.symlink("..", "parent")
              os.chdir("..")
              os.symlink(".", "self")
              os.symlink("missing", "broken")
              os.symlink(r"broken\bar", "broken1")
              os.symlink(r"self\self\broken", "broken2")
              os.symlink(r"subdir\parent\subdir\parent\broken", "broken3")
              os.symlink(ABSTFN + r"\broken", "broken4")
              os.symlink(r"recursive\..\broken", "broken5")
  
              self.assertPathEqual(ntpath.realpath("broken"),
                                   ABSTFN + r"\missing")
              self.assertPathEqual(ntpath.realpath(r"broken\foo"),
                                   ABSTFN + r"\missing\foo")
              # bpo-38453: We no longer recursively resolve segments of relative
              # symlinks that the OS cannot resolve.
              self.assertPathEqual(ntpath.realpath(r"broken1"),
                                   ABSTFN + r"\broken\bar")
              self.assertPathEqual(ntpath.realpath(r"broken1\baz"),
                                   ABSTFN + r"\broken\bar\baz")
              self.assertPathEqual(ntpath.realpath("broken2"),
                                   ABSTFN + r"\self\self\missing")
              self.assertPathEqual(ntpath.realpath("broken3"),
                                   ABSTFN + r"\subdir\parent\subdir\parent\missing")
              self.assertPathEqual(ntpath.realpath("broken4"),
                                   ABSTFN + r"\missing")
              self.assertPathEqual(ntpath.realpath("broken5"),
                                   ABSTFN + r"\missing")
  
              self.assertPathEqual(ntpath.realpath(b"broken"),
                                   os.fsencode(ABSTFN + r"\missing"))
              self.assertPathEqual(ntpath.realpath(rb"broken\foo"),
                                   os.fsencode(ABSTFN + r"\missing\foo"))
              self.assertPathEqual(ntpath.realpath(rb"broken1"),
                                   os.fsencode(ABSTFN + r"\broken\bar"))
              self.assertPathEqual(ntpath.realpath(rb"broken1\baz"),
                                   os.fsencode(ABSTFN + r"\broken\bar\baz"))
              self.assertPathEqual(ntpath.realpath(b"broken2"),
                                   os.fsencode(ABSTFN + r"\self\self\missing"))
              self.assertPathEqual(ntpath.realpath(rb"broken3"),
                                   os.fsencode(ABSTFN + r"\subdir\parent\subdir\parent\missing"))
              self.assertPathEqual(ntpath.realpath(b"broken4"),
                                   os.fsencode(ABSTFN + r"\missing"))
              self.assertPathEqual(ntpath.realpath(b"broken5"),
                                   os.fsencode(ABSTFN + r"\missing"))
  
      @os_helper.skip_unless_symlink
      @unittest.skipUnless(HAVE_GETFINALPATHNAME, 'need _getfinalpathname')
      def test_realpath_symlink_loops(self):
          # Symlink loops in non-strict mode are non-deterministic as to which
          # path is returned, but it will always be the fully resolved path of
          # one member of the cycle
          ABSTFN = ntpath.abspath(os_helper.TESTFN)
          self.addCleanup(os_helper.unlink, ABSTFN)
          self.addCleanup(os_helper.unlink, ABSTFN + "1")
          self.addCleanup(os_helper.unlink, ABSTFN + "2")
          self.addCleanup(os_helper.unlink, ABSTFN + "y")
          self.addCleanup(os_helper.unlink, ABSTFN + "c")
          self.addCleanup(os_helper.unlink, ABSTFN + "a")
  
          os.symlink(ABSTFN, ABSTFN)
          self.assertPathEqual(ntpath.realpath(ABSTFN), ABSTFN)
  
          os.symlink(ABSTFN + "1", ABSTFN + "2")
          os.symlink(ABSTFN + "2", ABSTFN + "1")
          expected = (ABSTFN + "1", ABSTFN + "2")
          self.assertPathIn(ntpath.realpath(ABSTFN + "1"), expected)
          self.assertPathIn(ntpath.realpath(ABSTFN + "2"), expected)
  
          self.assertPathIn(ntpath.realpath(ABSTFN + "1\\x"),
                            (ntpath.join(r, "x") for r in expected))
          self.assertPathEqual(ntpath.realpath(ABSTFN + "1\\.."),
                               ntpath.dirname(ABSTFN))
          self.assertPathEqual(ntpath.realpath(ABSTFN + "1\\..\\x"),
                               ntpath.dirname(ABSTFN) + "\\x")
          os.symlink(ABSTFN + "x", ABSTFN + "y")
          self.assertPathEqual(ntpath.realpath(ABSTFN + "1\\..\\"
                                               + ntpath.basename(ABSTFN) + "y"),
                               ABSTFN + "x")
          self.assertPathIn(ntpath.realpath(ABSTFN + "1\\..\\"
                                            + ntpath.basename(ABSTFN) + "1"),
                            expected)
  
          os.symlink(ntpath.basename(ABSTFN) + "a\\b", ABSTFN + "a")
          self.assertPathEqual(ntpath.realpath(ABSTFN + "a"), ABSTFN + "a")
  
          os.symlink("..\\" + ntpath.basename(ntpath.dirname(ABSTFN))
                     + "\\" + ntpath.basename(ABSTFN) + "c", ABSTFN + "c")
          self.assertPathEqual(ntpath.realpath(ABSTFN + "c"), ABSTFN + "c")
  
          # Test using relative path as well.
          self.assertPathEqual(ntpath.realpath(ntpath.basename(ABSTFN)), ABSTFN)
  
      @os_helper.skip_unless_symlink
      @unittest.skipUnless(HAVE_GETFINALPATHNAME, 'need _getfinalpathname')
      def test_realpath_symlink_loops_strict(self):
          # Symlink loops raise OSError in strict mode
          ABSTFN = ntpath.abspath(os_helper.TESTFN)
          self.addCleanup(os_helper.unlink, ABSTFN)
          self.addCleanup(os_helper.unlink, ABSTFN + "1")
          self.addCleanup(os_helper.unlink, ABSTFN + "2")
          self.addCleanup(os_helper.unlink, ABSTFN + "y")
          self.addCleanup(os_helper.unlink, ABSTFN + "c")
          self.addCleanup(os_helper.unlink, ABSTFN + "a")
  
          os.symlink(ABSTFN, ABSTFN)
          self.assertRaises(OSError, ntpath.realpath, ABSTFN, strict=True)
  
          os.symlink(ABSTFN + "1", ABSTFN + "2")
          os.symlink(ABSTFN + "2", ABSTFN + "1")
          self.assertRaises(OSError, ntpath.realpath, ABSTFN + "1", strict=True)
          self.assertRaises(OSError, ntpath.realpath, ABSTFN + "2", strict=True)
          self.assertRaises(OSError, ntpath.realpath, ABSTFN + "1\\x", strict=True)
          # Windows eliminates '..' components before resolving links, so the
          # following call is not expected to raise.
          self.assertPathEqual(ntpath.realpath(ABSTFN + "1\\..", strict=True),
                               ntpath.dirname(ABSTFN))
          self.assertRaises(OSError, ntpath.realpath, ABSTFN + "1\\..\\x", strict=True)
          os.symlink(ABSTFN + "x", ABSTFN + "y")
          self.assertRaises(OSError, ntpath.realpath, ABSTFN + "1\\..\\"
                                               + ntpath.basename(ABSTFN) + "y",
                                               strict=True)
          self.assertRaises(OSError, ntpath.realpath,
                            ABSTFN + "1\\..\\" + ntpath.basename(ABSTFN) + "1",
                            strict=True)
  
          os.symlink(ntpath.basename(ABSTFN) + "a\\b", ABSTFN + "a")
          self.assertRaises(OSError, ntpath.realpath, ABSTFN + "a", strict=True)
  
          os.symlink("..\\" + ntpath.basename(ntpath.dirname(ABSTFN))
                     + "\\" + ntpath.basename(ABSTFN) + "c", ABSTFN + "c")
          self.assertRaises(OSError, ntpath.realpath, ABSTFN + "c", strict=True)
  
          # Test using relative path as well.
          self.assertRaises(OSError, ntpath.realpath, ntpath.basename(ABSTFN),
                            strict=True)
  
      @os_helper.skip_unless_symlink
      @unittest.skipUnless(HAVE_GETFINALPATHNAME, 'need _getfinalpathname')
      def test_realpath_symlink_prefix(self):
          ABSTFN = ntpath.abspath(os_helper.TESTFN)
          self.addCleanup(os_helper.unlink, ABSTFN + "3")
          self.addCleanup(os_helper.unlink, "\\\\?\\" + ABSTFN + "3.")
          self.addCleanup(os_helper.unlink, ABSTFN + "3link")
          self.addCleanup(os_helper.unlink, ABSTFN + "3.link")
  
          with open(ABSTFN + "3", "wb") as f:
              f.write(b'0')
          os.symlink(ABSTFN + "3", ABSTFN + "3link")
  
          with open("\\\\?\\" + ABSTFN + "3.", "wb") as f:
              f.write(b'1')
          os.symlink("\\\\?\\" + ABSTFN + "3.", ABSTFN + "3.link")
  
          self.assertPathEqual(ntpath.realpath(ABSTFN + "3link"),
                               ABSTFN + "3")
          self.assertPathEqual(ntpath.realpath(ABSTFN + "3.link"),
                               "\\\\?\\" + ABSTFN + "3.")
  
          # Resolved paths should be usable to open target files
          with open(ntpath.realpath(ABSTFN + "3link"), "rb") as f:
              self.assertEqual(f.read(), b'0')
          with open(ntpath.realpath(ABSTFN + "3.link"), "rb") as f:
              self.assertEqual(f.read(), b'1')
  
          # When the prefix is included, it is not stripped
          self.assertPathEqual(ntpath.realpath("\\\\?\\" + ABSTFN + "3link"),
                               "\\\\?\\" + ABSTFN + "3")
          self.assertPathEqual(ntpath.realpath("\\\\?\\" + ABSTFN + "3.link"),
                               "\\\\?\\" + ABSTFN + "3.")
  
      @unittest.skipUnless(HAVE_GETFINALPATHNAME, 'need _getfinalpathname')
      def test_realpath_nul(self):
          tester("ntpath.realpath('NUL')", r'\\.\NUL')
  
      @unittest.skipUnless(HAVE_GETFINALPATHNAME, 'need _getfinalpathname')
      @unittest.skipUnless(HAVE_GETSHORTPATHNAME, 'need _getshortpathname')
      def test_realpath_cwd(self):
          ABSTFN = ntpath.abspath(os_helper.TESTFN)
  
          os_helper.unlink(ABSTFN)
          os_helper.rmtree(ABSTFN)
          os.mkdir(ABSTFN)
          self.addCleanup(os_helper.rmtree, ABSTFN)
  
          test_dir_long = ntpath.join(ABSTFN, "MyVeryLongDirectoryName")
          os.mkdir(test_dir_long)
  
          test_dir_short = _getshortpathname(test_dir_long)
          test_file_long = ntpath.join(test_dir_long, "file.txt")
          test_file_short = ntpath.join(test_dir_short, "file.txt")
  
          with open(test_file_long, "wb") as f:
              f.write(b"content")
  
          self.assertPathEqual(test_file_long, ntpath.realpath(test_file_short))
  
          with os_helper.change_cwd(test_dir_long):
              self.assertPathEqual(test_file_long, ntpath.realpath("file.txt"))
          with os_helper.change_cwd(test_dir_long.lower()):
              self.assertPathEqual(test_file_long, ntpath.realpath("file.txt"))
          with os_helper.change_cwd(test_dir_short):
              self.assertPathEqual(test_file_long, ntpath.realpath("file.txt"))
  
      def test_expandvars(self):
          with os_helper.EnvironmentVarGuard() as env:
              env.clear()
              env["foo"] = "bar"
              env["{foo"] = "baz1"
              env["{foo}"] = "baz2"
              tester('ntpath.expandvars("foo")', "foo")
              tester('ntpath.expandvars("$foo bar")', "bar bar")
              tester('ntpath.expandvars("${foo}bar")', "barbar")
              tester('ntpath.expandvars("$[foo]bar")', "$[foo]bar")
              tester('ntpath.expandvars("$bar bar")', "$bar bar")
              tester('ntpath.expandvars("$?bar")', "$?bar")
              tester('ntpath.expandvars("$foo}bar")', "bar}bar")
              tester('ntpath.expandvars("${foo")', "${foo")
              tester('ntpath.expandvars("${{foo}}")', "baz1}")
              tester('ntpath.expandvars("$foo$foo")', "barbar")
              tester('ntpath.expandvars("$bar$bar")', "$bar$bar")
              tester('ntpath.expandvars("%foo% bar")', "bar bar")
              tester('ntpath.expandvars("%foo%bar")', "barbar")
              tester('ntpath.expandvars("%foo%%foo%")', "barbar")
              tester('ntpath.expandvars("%%foo%%foo%foo%")', "%foo%foobar")
              tester('ntpath.expandvars("%?bar%")', "%?bar%")
              tester('ntpath.expandvars("%foo%%bar")', "bar%bar")
              tester('ntpath.expandvars("\'%foo%\'%bar")', "\'%foo%\'%bar")
              tester('ntpath.expandvars("bar\'%foo%")', "bar\'%foo%")
  
      @unittest.skipUnless(os_helper.FS_NONASCII, 'need os_helper.FS_NONASCII')
      def test_expandvars_nonascii(self):
          def check(value, expected):
              tester('ntpath.expandvars(%r)' % value, expected)
          with os_helper.EnvironmentVarGuard() as env:
              env.clear()
              nonascii = os_helper.FS_NONASCII
              env['spam'] = nonascii
              env[nonascii] = 'ham' + nonascii
              check('$spam bar', '%s bar' % nonascii)
              check('$%s bar' % nonascii, '$%s bar' % nonascii)
              check('${spam}bar', '%sbar' % nonascii)
              check('${%s}bar' % nonascii, 'ham%sbar' % nonascii)
              check('$spam}bar', '%s}bar' % nonascii)
              check('$%s}bar' % nonascii, '$%s}bar' % nonascii)
              check('%spam% bar', '%s bar' % nonascii)
              check('%{}% bar'.format(nonascii), 'ham%s bar' % nonascii)
              check('%spam%bar', '%sbar' % nonascii)
              check('%{}%bar'.format(nonascii), 'ham%sbar' % nonascii)
  
      def test_expanduser(self):
          tester('ntpath.expanduser("test")', 'test')
  
          with os_helper.EnvironmentVarGuard() as env:
              env.clear()
              tester('ntpath.expanduser("~test")', '~test')
  
              env['HOMEDRIVE'] = 'C:\\'
              env['HOMEPATH'] = 'Users\\eric'
              env['USERNAME'] = 'eric'
              tester('ntpath.expanduser("~test")', 'C:\\Users\\test')
              tester('ntpath.expanduser("~")', 'C:\\Users\\eric')
  
              del env['HOMEDRIVE']
              tester('ntpath.expanduser("~test")', 'Users\\test')
              tester('ntpath.expanduser("~")', 'Users\\eric')
  
              env.clear()
              env['USERPROFILE'] = 'C:\\Users\\eric'
              env['USERNAME'] = 'eric'
              tester('ntpath.expanduser("~test")', 'C:\\Users\\test')
              tester('ntpath.expanduser("~")', 'C:\\Users\\eric')
              tester('ntpath.expanduser("~test\\foo\\bar")',
                     'C:\\Users\\test\\foo\\bar')
              tester('ntpath.expanduser("~test/foo/bar")',
                     'C:\\Users\\test/foo/bar')
              tester('ntpath.expanduser("~\\foo\\bar")',
                     'C:\\Users\\eric\\foo\\bar')
              tester('ntpath.expanduser("~/foo/bar")',
                     'C:\\Users\\eric/foo/bar')
  
              # bpo-36264: ignore `HOME` when set on windows
              env.clear()
              env['HOME'] = 'F:\\'
              env['USERPROFILE'] = 'C:\\Users\\eric'
              env['USERNAME'] = 'eric'
              tester('ntpath.expanduser("~test")', 'C:\\Users\\test')
              tester('ntpath.expanduser("~")', 'C:\\Users\\eric')
  
              # bpo-39899: don't guess another user's home directory if
              # `%USERNAME% != basename(%USERPROFILE%)`
              env.clear()
              env['USERPROFILE'] = 'C:\\Users\\eric'
              env['USERNAME'] = 'idle'
              tester('ntpath.expanduser("~test")', '~test')
              tester('ntpath.expanduser("~")', 'C:\\Users\\eric')
  
  
  
      @unittest.skipUnless(nt, "abspath requires 'nt' module")
      def test_abspath(self):
          tester('ntpath.abspath("C:\\")', "C:\\")
          tester('ntpath.abspath("\\\\?\\C:////spam////eggs. . .")', "\\\\?\\C:\\spam\\eggs")
          tester('ntpath.abspath("\\\\.\\C:////spam////eggs. . .")', "\\\\.\\C:\\spam\\eggs")
          tester('ntpath.abspath("//spam//eggs. . .")',     "\\\\spam\\eggs")
          tester('ntpath.abspath("\\\\spam\\\\eggs. . .")', "\\\\spam\\eggs")
          tester('ntpath.abspath("C:/spam. . .")',  "C:\\spam")
          tester('ntpath.abspath("C:\\spam. . .")', "C:\\spam")
          tester('ntpath.abspath("C:/nul")',  "\\\\.\\nul")
          tester('ntpath.abspath("C:\\nul")', "\\\\.\\nul")
          tester('ntpath.abspath("//..")',           "\\\\")
          tester('ntpath.abspath("//../")',          "\\\\..\\")
          tester('ntpath.abspath("//../..")',        "\\\\..\\")
          tester('ntpath.abspath("//../../")',       "\\\\..\\..\\")
          tester('ntpath.abspath("//../../../")',    "\\\\..\\..\\")
          tester('ntpath.abspath("//../../../..")',  "\\\\..\\..\\")
          tester('ntpath.abspath("//../../../../")', "\\\\..\\..\\")
          tester('ntpath.abspath("//server")',           "\\\\server")
          tester('ntpath.abspath("//server/")',          "\\\\server\\")
          tester('ntpath.abspath("//server/..")',        "\\\\server\\")
          tester('ntpath.abspath("//server/../")',       "\\\\server\\..\\")
          tester('ntpath.abspath("//server/../..")',     "\\\\server\\..\\")
          tester('ntpath.abspath("//server/../../")',    "\\\\server\\..\\")
          tester('ntpath.abspath("//server/../../..")',  "\\\\server\\..\\")
          tester('ntpath.abspath("//server/../../../")', "\\\\server\\..\\")
          tester('ntpath.abspath("//server/share")',        "\\\\server\\share")
          tester('ntpath.abspath("//server/share/")',       "\\\\server\\share\\")
          tester('ntpath.abspath("//server/share/..")',     "\\\\server\\share\\")
          tester('ntpath.abspath("//server/share/../")',    "\\\\server\\share\\")
          tester('ntpath.abspath("//server/share/../..")',  "\\\\server\\share\\")
          tester('ntpath.abspath("//server/share/../../")', "\\\\server\\share\\")
          tester('ntpath.abspath("C:\\nul. . .")', "\\\\.\\nul")
          tester('ntpath.abspath("//... . .")',  "\\\\")
          tester('ntpath.abspath("//.. . . .")', "\\\\")
          tester('ntpath.abspath("//../... . .")',  "\\\\..\\")
          tester('ntpath.abspath("//../.. . . .")', "\\\\..\\")
          with os_helper.temp_cwd(os_helper.TESTFN) as cwd_dir: # bpo-31047
              tester('ntpath.abspath("")', cwd_dir)
              tester('ntpath.abspath(" ")', cwd_dir + "\\ ")
              tester('ntpath.abspath("?")', cwd_dir + "\\?")
              drive, _ = ntpath.splitdrive(cwd_dir)
              tester('ntpath.abspath("/abc/")', drive + "\\abc")
  
      def test_relpath(self):
          tester('ntpath.relpath("a")', 'a')
          tester('ntpath.relpath(ntpath.abspath("a"))', 'a')
          tester('ntpath.relpath("a/b")', 'a\\b')
          tester('ntpath.relpath("../a/b")', '..\\a\\b')
          with os_helper.temp_cwd(os_helper.TESTFN) as cwd_dir:
              currentdir = ntpath.basename(cwd_dir)
              tester('ntpath.relpath("a", "../b")', '..\\'+currentdir+'\\a')
              tester('ntpath.relpath("a/b", "../c")', '..\\'+currentdir+'\\a\\b')
          tester('ntpath.relpath("a", "b/c")', '..\\..\\a')
          tester('ntpath.relpath("c:/foo/bar/bat", "c:/x/y")', '..\\..\\foo\\bar\\bat')
          tester('ntpath.relpath("//conky/mountpoint/a", "//conky/mountpoint/b/c")', '..\\..\\a')
          tester('ntpath.relpath("a", "a")', '.')
          tester('ntpath.relpath("/foo/bar/bat", "/x/y/z")', '..\\..\\..\\foo\\bar\\bat')
          tester('ntpath.relpath("/foo/bar/bat", "/foo/bar")', 'bat')
          tester('ntpath.relpath("/foo/bar/bat", "/")', 'foo\\bar\\bat')
          tester('ntpath.relpath("/", "/foo/bar/bat")', '..\\..\\..')
          tester('ntpath.relpath("/foo/bar/bat", "/x")', '..\\foo\\bar\\bat')
          tester('ntpath.relpath("/x", "/foo/bar/bat")', '..\\..\\..\\x')
          tester('ntpath.relpath("/", "/")', '.')
          tester('ntpath.relpath("/a", "/a")', '.')
          tester('ntpath.relpath("/a/b", "/a/b")', '.')
          tester('ntpath.relpath("c:/foo", "C:/FOO")', '.')
  
      def test_commonpath(self):
          def check(paths, expected):
              tester(('ntpath.commonpath(%r)' % paths).replace('\\\\', '\\'),
                     expected)
          def check_error(exc, paths):
              self.assertRaises(exc, ntpath.commonpath, paths)
              self.assertRaises(exc, ntpath.commonpath,
                                [os.fsencode(p) for p in paths])
  
          self.assertRaises(ValueError, ntpath.commonpath, [])
          check_error(ValueError, ['C:\\Program Files', 'Program Files'])
          check_error(ValueError, ['C:\\Program Files', 'C:Program Files'])
          check_error(ValueError, ['\\Program Files', 'Program Files'])
          check_error(ValueError, ['Program Files', 'C:\\Program Files'])
          check(['C:\\Program Files'], 'C:\\Program Files')
          check(['C:\\Program Files', 'C:\\Program Files'], 'C:\\Program Files')
          check(['C:\\Program Files\\', 'C:\\Program Files'],
                'C:\\Program Files')
          check(['C:\\Program Files\\', 'C:\\Program Files\\'],
                'C:\\Program Files')
          check(['C:\\\\Program Files', 'C:\\Program Files\\\\'],
                'C:\\Program Files')
          check(['C:\\.\\Program Files', 'C:\\Program Files\\.'],
                'C:\\Program Files')
          check(['C:\\', 'C:\\bin'], 'C:\\')
          check(['C:\\Program Files', 'C:\\bin'], 'C:\\')
          check(['C:\\Program Files', 'C:\\Program Files\\Bar'],
                'C:\\Program Files')
          check(['C:\\Program Files\\Foo', 'C:\\Program Files\\Bar'],
                'C:\\Program Files')
          check(['C:\\Program Files', 'C:\\Projects'], 'C:\\')
          check(['C:\\Program Files\\', 'C:\\Projects'], 'C:\\')
  
          check(['C:\\Program Files\\Foo', 'C:/Program Files/Bar'],
                'C:\\Program Files')
          check(['C:\\Program Files\\Foo', 'c:/program files/bar'],
                'C:\\Program Files')
          check(['c:/program files/bar', 'C:\\Program Files\\Foo'],
                'c:\\program files')
  
          check_error(ValueError, ['C:\\Program Files', 'D:\\Program Files'])
  
          check(['spam'], 'spam')
          check(['spam', 'spam'], 'spam')
          check(['spam', 'alot'], '')
          check(['and\\jam', 'and\\spam'], 'and')
          check(['and\\\\jam', 'and\\spam\\\\'], 'and')
          check(['and\\.\\jam', '.\\and\\spam'], 'and')
          check(['and\\jam', 'and\\spam', 'alot'], '')
          check(['and\\jam', 'and\\spam', 'and'], 'and')
          check(['C:and\\jam', 'C:and\\spam'], 'C:and')
  
          check([''], '')
          check(['', 'spam\\alot'], '')
          check_error(ValueError, ['', '\\spam\\alot'])
  
          self.assertRaises(TypeError, ntpath.commonpath,
                            [b'C:\\Program Files', 'C:\\Program Files\\Foo'])
          self.assertRaises(TypeError, ntpath.commonpath,
                            [b'C:\\Program Files', 'Program Files\\Foo'])
          self.assertRaises(TypeError, ntpath.commonpath,
                            [b'Program Files', 'C:\\Program Files\\Foo'])
          self.assertRaises(TypeError, ntpath.commonpath,
                            ['C:\\Program Files', b'C:\\Program Files\\Foo'])
          self.assertRaises(TypeError, ntpath.commonpath,
                            ['C:\\Program Files', b'Program Files\\Foo'])
          self.assertRaises(TypeError, ntpath.commonpath,
                            ['Program Files', b'C:\\Program Files\\Foo'])
  
      def test_sameopenfile(self):
          with TemporaryFile() as tf1, TemporaryFile() as tf2:
              # Make sure the same file is really the same
              self.assertTrue(ntpath.sameopenfile(tf1.fileno(), tf1.fileno()))
              # Make sure different files are really different
              self.assertFalse(ntpath.sameopenfile(tf1.fileno(), tf2.fileno()))
              # Make sure invalid values don't cause issues on win32
              if sys.platform == "win32":
                  with self.assertRaises(OSError):
                      # Invalid file descriptors shouldn't display assert
                      # dialogs (#4804)
                      ntpath.sameopenfile(-1, -1)
  
      def test_ismount(self):
          self.assertTrue(ntpath.ismount("c:\\"))
          self.assertTrue(ntpath.ismount("C:\\"))
          self.assertTrue(ntpath.ismount("c:/"))
          self.assertTrue(ntpath.ismount("C:/"))
          self.assertTrue(ntpath.ismount("\\\\.\\c:\\"))
          self.assertTrue(ntpath.ismount("\\\\.\\C:\\"))
  
          self.assertTrue(ntpath.ismount(b"c:\\"))
          self.assertTrue(ntpath.ismount(b"C:\\"))
          self.assertTrue(ntpath.ismount(b"c:/"))
          self.assertTrue(ntpath.ismount(b"C:/"))
          self.assertTrue(ntpath.ismount(b"\\\\.\\c:\\"))
          self.assertTrue(ntpath.ismount(b"\\\\.\\C:\\"))
  
          with os_helper.temp_dir() as d:
              self.assertFalse(ntpath.ismount(d))
  
          if sys.platform == "win32":
              #
              # Make sure the current folder isn't the root folder
              # (or any other volume root). The drive-relative
              # locations below cannot then refer to mount points
              #
              test_cwd = os.getenv("SystemRoot")
              drive, path = ntpath.splitdrive(test_cwd)
              with os_helper.change_cwd(test_cwd):
                  self.assertFalse(ntpath.ismount(drive.lower()))
                  self.assertFalse(ntpath.ismount(drive.upper()))
  
              self.assertTrue(ntpath.ismount("\\\\localhost\\c$"))
              self.assertTrue(ntpath.ismount("\\\\localhost\\c$\\"))
  
              self.assertTrue(ntpath.ismount(b"\\\\localhost\\c$"))
              self.assertTrue(ntpath.ismount(b"\\\\localhost\\c$\\"))
  
      def assertEqualCI(self, s1, s2):
          """Assert that two strings are equal ignoring case differences."""
          self.assertEqual(s1.lower(), s2.lower())
  
      @unittest.skipUnless(nt, "OS helpers require 'nt' module")
      def test_nt_helpers(self):
          # Trivial validation that the helpers do not break, and support both
          # unicode and bytes (UTF-8) paths
  
          executable = nt._getfinalpathname(sys.executable)
  
          for path in executable, os.fsencode(executable):
              volume_path = nt._getvolumepathname(path)
              path_drive = ntpath.splitdrive(path)[0]
              volume_path_drive = ntpath.splitdrive(volume_path)[0]
              self.assertEqualCI(path_drive, volume_path_drive)
  
          cap, free = nt._getdiskusage(sys.exec_prefix)
          self.assertGreater(cap, 0)
          self.assertGreater(free, 0)
          b_cap, b_free = nt._getdiskusage(sys.exec_prefix.encode())
          # Free space may change, so only test the capacity is equal
          self.assertEqual(b_cap, cap)
          self.assertGreater(b_free, 0)
  
          for path in [sys.prefix, sys.executable]:
              final_path = nt._getfinalpathname(path)
              self.assertIsInstance(final_path, str)
              self.assertGreater(len(final_path), 0)
  
              b_final_path = nt._getfinalpathname(path.encode())
              self.assertIsInstance(b_final_path, bytes)
              self.assertGreater(len(b_final_path), 0)
  
  class NtCommonTest(test_genericpath.CommonTest, unittest.TestCase):
      pathmodule = ntpath
      attributes = ['relpath']
  
  
  class PathLikeTests(NtpathTestCase):
  
      path = ntpath
  
      def setUp(self):
          self.file_name = os_helper.TESTFN
          self.file_path = FakePath(os_helper.TESTFN)
          self.addCleanup(os_helper.unlink, self.file_name)
          with open(self.file_name, 'xb', 0) as file:
              file.write(b"test_ntpath.PathLikeTests")
  
      def _check_function(self, func):
          self.assertPathEqual(func(self.file_path), func(self.file_name))
  
      def test_path_normcase(self):
          self._check_function(self.path.normcase)
  
      def test_path_isabs(self):
          self._check_function(self.path.isabs)
  
      def test_path_join(self):
          self.assertEqual(self.path.join('a', FakePath('b'), 'c'),
                           self.path.join('a', 'b', 'c'))
  
      def test_path_split(self):
          self._check_function(self.path.split)
  
      def test_path_splitext(self):
          self._check_function(self.path.splitext)
  
      def test_path_splitdrive(self):
          self._check_function(self.path.splitdrive)
  
      def test_path_basename(self):
          self._check_function(self.path.basename)
  
      def test_path_dirname(self):
          self._check_function(self.path.dirname)
  
      def test_path_islink(self):
          self._check_function(self.path.islink)
  
      def test_path_lexists(self):
          self._check_function(self.path.lexists)
  
      def test_path_ismount(self):
          self._check_function(self.path.ismount)
  
      def test_path_expanduser(self):
          self._check_function(self.path.expanduser)
  
      def test_path_expandvars(self):
          self._check_function(self.path.expandvars)
  
      def test_path_normpath(self):
          self._check_function(self.path.normpath)
  
      def test_path_abspath(self):
          self._check_function(self.path.abspath)
  
      def test_path_realpath(self):
          self._check_function(self.path.realpath)
  
      def test_path_relpath(self):
          self._check_function(self.path.relpath)
  
      def test_path_commonpath(self):
          common_path = self.path.commonpath([self.file_path, self.file_name])
          self.assertPathEqual(common_path, self.file_name)
  
      def test_path_isdir(self):
          self._check_function(self.path.isdir)
  
  
  if __name__ == "__main__":
      unittest.main()
  