"""Tests for distutils.dir_util."""
import unittest
import os
import stat
import sys
import contextlib

from distutils import dir_util, errors
from distutils.dir_util import (mkpath, remove_tree, create_tree, copy_tree,
                                ensure_relative)

from distutils import log
from distutils.tests import support
from test.support import run_unittest


@contextlib.context_manager
def patch_obj(obj, attr, replacement):
    """
    A poor man's mock.patch.object
    """
    orig = getattr(obj, attr)
    try:
        setattr(obj, attr, replacement)
        yield
    finally:
        setattr(obj, attr, orig)


class DirUtilTestCase(support.TempdirManager, unittest.TestCase):

    def _log(self, msg, *args):
        if len(args) > 0:
            self._logs.append(msg % args)
        else:
            self._logs.append(msg)

    def setUp(self):
        super(DirUtilTestCase, self).setUp()
        self._logs = []
        tmp_dir = self.mkdtemp()
        self.root_target = os.path.join(tmp_dir, 'deep')
        self.target = os.path.join(self.root_target, 'here')
        self.target2 = os.path.join(tmp_dir, 'deep2')
        self.old_log = log.info
        log.info = self._log

    def tearDown(self):
        log.info = self.old_log
        super(DirUtilTestCase, self).tearDown()

    def test_mkpath_remove_tree_verbosity(self):

        mkpath(self.target, verbose=0)
        wanted = []
        self.assertEqual(self._logs, wanted)
        remove_tree(self.root_target, verbose=0)

        mkpath(self.target, verbose=1)
        wanted = ['creating %s' % self.root_target,
                  'creating %s' % self.target]
        self.assertEqual(self._logs, wanted)
        self._logs = []

        remove_tree(self.root_target, verbose=1)
        wanted = ["removing '%s' (and everything under it)" % self.root_target]
        self.assertEqual(self._logs, wanted)

    @unittest.skipIf(sys.platform.startswith('win'),
        "This test is only appropriate for POSIX-like systems.")
    def test_mkpath_with_custom_mode(self):
        # Get and set the current umask value for testing mode bits.
        umask = os.umask(0o002)
        os.umask(umask)
        mkpath(self.target, 0o700)
        self.assertEqual(
            stat.S_IMODE(os.stat(self.target).st_mode), 0o700 & ~umask)
        mkpath(self.target2, 0o555)
        self.assertEqual(
            stat.S_IMODE(os.stat(self.target2).st_mode), 0o555 & ~umask)

    def test_create_tree_verbosity(self):

        create_tree(self.root_target, ['one', 'two', 'three'], verbose=0)
        self.assertEqual(self._logs, [])
        remove_tree(self.root_target, verbose=0)

        wanted = ['creating %s' % self.root_target]
        create_tree(self.root_target, ['one', 'two', 'three'], verbose=1)
        self.assertEqual(self._logs, wanted)

        remove_tree(self.root_target, verbose=0)

    def test_copy_tree_verbosity(self):

        mkpath(self.target, verbose=0)

        copy_tree(self.target, self.target2, verbose=0)
        self.assertEqual(self._logs, [])

        remove_tree(self.root_target, verbose=0)

        mkpath(self.target, verbose=0)
        a_file = os.path.join(self.target, 'ok.txt')
        with open(a_file, 'w') as f:
            f.write('some content')

        wanted = ['copying %s -> %s' % (a_file, self.target2)]
        copy_tree(self.target, self.target2, verbose=1)
        self.assertEqual(self._logs, wanted)

        remove_tree(self.root_target, verbose=0)
        remove_tree(self.target2, verbose=0)

    def test_copy_tree_skips_nfs_temp_files(self):
        mkpath(self.target, verbose=0)

        a_file = os.path.join(self.target, 'ok.txt')
        nfs_file = os.path.join(self.target, '.nfs123abc')
        for f in a_file, nfs_file:
            with open(f, 'w') as fh:
                fh.write('some content')

        copy_tree(self.target, self.target2)
        self.assertEqual(os.listdir(self.target2), ['ok.txt'])

        remove_tree(self.root_target, verbose=0)
        remove_tree(self.target2, verbose=0)

    def test_ensure_relative(self):
        if os.sep == '/':
            self.assertEqual(ensure_relative('/home/foo'), 'home/foo')
            self.assertEqual(ensure_relative('some/path'), 'some/path')
        else:   # \\
            self.assertEqual(ensure_relative('c:\\home\\foo'), 'c:home\\foo')
            self.assertEqual(ensure_relative('home\\foo'), 'home\\foo')

    def test_copy_tree_exception_in_listdir(self):
        """
        An exception in listdir should raise a DistutilsFileError
        """
        def new_listdir(path):
            raise OSError()
        # simulate a transient network error or other failure invoking listdir
        with patch_obj(os, 'listdir', new_listdir):
            args = 'src', None
            exc = errors.DistutilsFileError
            self.assertRaises(exc, dir_util.copy_tree, *args)


def test_suite():
    return unittest.makeSuite(DirUtilTestCase)

if __name__ == "__main__":
    run_unittest(test_suite())

@@ -82,25 +82,39 @@
 sys%0A
-import contextlib
+from unittest.mock import patch
 %0A%0Afr
@@ -339,16 +339,16 @@
 support%0A
+
 from tes
@@ -383,267 +383,8 @@
 t%0A%0A%0A
-@contextlib.context_manager%0Adef patch_obj(obj, attr, replacement):%0A    %22%22%22%0A    A poor man's mock.patch.object%0A    %22%22%22%0A    orig = getattr(obj, attr)%0A    try:%0A        setattr(obj, attr, replacement)%0A        yield%0A    finally:%0A        setattr(obj, attr, orig)%0A%0A%0A
 clas
@@ -4180,24 +4180,72 @@
 ome%5C%5Cfoo')%0A%0A
+    @patch('os.listdir', side_effect=OSError())%0A
     def test
@@ -4276,24 +4276,33 @@
 listdir(self
+, listdir
 ):%0A        %22
@@ -4394,239 +4394,31 @@
     
-def new_listdir(path):%0A            raise OSError()%0A        # simulate a transient network error or other failure invoking listdir%0A        with patch_obj(os, 'listdir', new_listdir):%0A            args = 'src', None%0A            exc = 
+with self.assertRaises(
 erro
@@ -4430,32 +4430,34 @@
 stutilsFileError
+):
 %0A            sel
@@ -4456,31 +4456,8 @@
     
- self.assertRaises(exc,
  dir
@@ -4471,23 +4471,28 @@
 opy_tree
-, *args
+('src', None
 )%0A%0A%0Adef 

Use technique outlined in test_file_util