~bzr-pqm/bzr/bzr.dev

# Copyright (C) 2005, 2006, 2007 Canonical Ltd

#

# This program is free software; you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation; either version 2 of the License, or

# (at your option) any later version.

#

# This program is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

# GNU General Public License for more details.

#

# You should have received a copy of the GNU General Public License

# along with this program; if not, write to the Free Software

# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

"""Tests for the osutils wrapper."""

import errno

import os

import socket

import stat

import sys

import bzrlib

from bzrlib import (

    errors,

    osutils,

    win32utils,

    )

from bzrlib.errors import BzrBadParameterNotUnicode, InvalidURL

from bzrlib.osutils import (

        is_inside_any,

        is_inside_or_parent_of_any,

        pathjoin,

        pumpfile,

        )

from bzrlib.tests import (

        probe_unicode_in_user_encoding,

        StringIOWrapper,

        SymlinkFeature,

        TestCase,

        TestCaseInTempDir,

        TestSkipped,

        )

from bzrlib.tests.file_utils import (

    FakeReadFile,

    )

from cStringIO import StringIO

class TestOSUtils(TestCaseInTempDir):

    def test_contains_whitespace(self):

        self.failUnless(osutils.contains_whitespace(u' '))

        self.failUnless(osutils.contains_whitespace(u'hello there'))

        self.failUnless(osutils.contains_whitespace(u'hellothere\n'))

        self.failUnless(osutils.contains_whitespace(u'hello\nthere'))

        self.failUnless(osutils.contains_whitespace(u'hello\rthere'))

        self.failUnless(osutils.contains_whitespace(u'hello\tthere'))

        # \xa0 is "Non-breaking-space" which on some python locales thinks it

        # is whitespace, but we do not.

        self.failIf(osutils.contains_whitespace(u''))

        self.failIf(osutils.contains_whitespace(u'hellothere'))

        self.failIf(osutils.contains_whitespace(u'hello\xa0there'))

    def test_fancy_rename(self):

        # This should work everywhere

        def rename(a, b):

            osutils.fancy_rename(a, b,

                    rename_func=os.rename,

                    unlink_func=os.unlink)

        open('a', 'wb').write('something in a\n')

        rename('a', 'b')

        self.failIfExists('a')

        self.failUnlessExists('b')

        self.check_file_contents('b', 'something in a\n')

        open('a', 'wb').write('new something in a\n')

        rename('b', 'a')

        self.check_file_contents('a', 'something in a\n')

    def test_rename(self):

        # Rename should be semi-atomic on all platforms

        open('a', 'wb').write('something in a\n')

        osutils.rename('a', 'b')

        self.failIfExists('a')

        self.failUnlessExists('b')

        self.check_file_contents('b', 'something in a\n')

        open('a', 'wb').write('new something in a\n')

        osutils.rename('b', 'a')

        self.check_file_contents('a', 'something in a\n')

    # TODO: test fancy_rename using a MemoryTransport

    def test_rename_change_case(self):

        # on Windows we should be able to change filename case by rename

        self.build_tree(['a', 'b/'])

        osutils.rename('a', 'A')

        osutils.rename('b', 'B')

        # we can't use failUnlessExists on case-insensitive filesystem

        # so try to check shape of the tree

        shape = sorted(os.listdir('.'))

        self.assertEquals(['A', 'B'], shape)

    def test_01_rand_chars_empty(self):

        result = osutils.rand_chars(0)

        self.assertEqual(result, '')

    def test_02_rand_chars_100(self):

        result = osutils.rand_chars(100)

        self.assertEqual(len(result), 100)

        self.assertEqual(type(result), str)

        self.assertContainsRe(result, r'^[a-z0-9]{100}$')

    def test_is_inside(self):

        is_inside = osutils.is_inside

        self.assertTrue(is_inside('src', 'src/foo.c'))

        self.assertFalse(is_inside('src', 'srccontrol'))

        self.assertTrue(is_inside('src', 'src/a/a/a/foo.c'))

        self.assertTrue(is_inside('foo.c', 'foo.c'))

        self.assertFalse(is_inside('foo.c', ''))

        self.assertTrue(is_inside('', 'foo.c'))

    def test_is_inside_any(self):

        SRC_FOO_C = pathjoin('src', 'foo.c')

        for dirs, fn in [(['src', 'doc'], SRC_FOO_C),

                         (['src'], SRC_FOO_C),

                         (['src'], 'src'),

                         ]:

            self.assert_(is_inside_any(dirs, fn))

        for dirs, fn in [(['src'], 'srccontrol'),

                         (['src'], 'srccontrol/foo')]:

            self.assertFalse(is_inside_any(dirs, fn))

    def test_is_inside_or_parent_of_any(self):

        for dirs, fn in [(['src', 'doc'], 'src/foo.c'),

                         (['src'], 'src/foo.c'),

                         (['src/bar.c'], 'src'),

                         (['src/bar.c', 'bla/foo.c'], 'src'),

                         (['src'], 'src'),

                         ]:

            self.assert_(is_inside_or_parent_of_any(dirs, fn))

        for dirs, fn in [(['src'], 'srccontrol'),

                         (['srccontrol/foo.c'], 'src'),

                         (['src'], 'srccontrol/foo')]:

            self.assertFalse(is_inside_or_parent_of_any(dirs, fn))

    def test_rmtree(self):

        # Check to remove tree with read-only files/dirs

        os.mkdir('dir')

        f = file('dir/file', 'w')

        f.write('spam')

        f.close()

        # would like to also try making the directory readonly, but at the

        # moment python shutil.rmtree doesn't handle that properly - it would

        # need to chmod the directory before removing things inside it - deferred

        # for now -- mbp 20060505

        # osutils.make_readonly('dir')

        osutils.make_readonly('dir/file')

        osutils.rmtree('dir')

        self.failIfExists('dir/file')

        self.failIfExists('dir')

    def test_file_kind(self):

        self.build_tree(['file', 'dir/'])

        self.assertEquals('file', osutils.file_kind('file'))

        self.assertEquals('directory', osutils.file_kind('dir/'))

        if osutils.has_symlinks():

            os.symlink('symlink', 'symlink')

            self.assertEquals('symlink', osutils.file_kind('symlink'))

        # TODO: jam 20060529 Test a block device

        try:

            os.lstat('/dev/null')

        except OSError, e:

            if e.errno not in (errno.ENOENT,):

                raise

        else:

            self.assertEquals('chardev', osutils.file_kind('/dev/null'))

        mkfifo = getattr(os, 'mkfifo', None)

        if mkfifo:

            mkfifo('fifo')

            try:

                self.assertEquals('fifo', osutils.file_kind('fifo'))

            finally:

                os.remove('fifo')

        AF_UNIX = getattr(socket, 'AF_UNIX', None)

        if AF_UNIX:

            s = socket.socket(AF_UNIX)

            s.bind('socket')

            try:

                self.assertEquals('socket', osutils.file_kind('socket'))

            finally:

                os.remove('socket')

    def test_kind_marker(self):

        self.assertEqual(osutils.kind_marker('file'), '')

        self.assertEqual(osutils.kind_marker('directory'), '/')

        self.assertEqual(osutils.kind_marker('symlink'), '@')

        self.assertEqual(osutils.kind_marker('tree-reference'), '+')

    def test_get_umask(self):

        if sys.platform == 'win32':

            # umask always returns '0', no way to set it

            self.assertEqual(0, osutils.get_umask())

            return

        orig_umask = osutils.get_umask()

        try:

            os.umask(0222)

            self.assertEqual(0222, osutils.get_umask())

            os.umask(0022)

            self.assertEqual(0022, osutils.get_umask())

            os.umask(0002)

            self.assertEqual(0002, osutils.get_umask())

            os.umask(0027)

            self.assertEqual(0027, osutils.get_umask())

        finally:

            os.umask(orig_umask)

    def assertFormatedDelta(self, expected, seconds):

        """Assert osutils.format_delta formats as expected"""

        actual = osutils.format_delta(seconds)

        self.assertEqual(expected, actual)

    def test_format_delta(self):

        self.assertFormatedDelta('0 seconds ago', 0)

        self.assertFormatedDelta('1 second ago', 1)

        self.assertFormatedDelta('10 seconds ago', 10)

        self.assertFormatedDelta('59 seconds ago', 59)

        self.assertFormatedDelta('89 seconds ago', 89)

        self.assertFormatedDelta('1 minute, 30 seconds ago', 90)

        self.assertFormatedDelta('3 minutes, 0 seconds ago', 180)

        self.assertFormatedDelta('3 minutes, 1 second ago', 181)

        self.assertFormatedDelta('10 minutes, 15 seconds ago', 615)

        self.assertFormatedDelta('30 minutes, 59 seconds ago', 1859)

        self.assertFormatedDelta('31 minutes, 0 seconds ago', 1860)

        self.assertFormatedDelta('60 minutes, 0 seconds ago', 3600)

        self.assertFormatedDelta('89 minutes, 59 seconds ago', 5399)

        self.assertFormatedDelta('1 hour, 30 minutes ago', 5400)

        self.assertFormatedDelta('2 hours, 30 minutes ago', 9017)

        self.assertFormatedDelta('10 hours, 0 minutes ago', 36000)

        self.assertFormatedDelta('24 hours, 0 minutes ago', 86400)

        self.assertFormatedDelta('35 hours, 59 minutes ago', 129599)

        self.assertFormatedDelta('36 hours, 0 minutes ago', 129600)

        self.assertFormatedDelta('36 hours, 0 minutes ago', 129601)

        self.assertFormatedDelta('36 hours, 1 minute ago', 129660)

        self.assertFormatedDelta('36 hours, 1 minute ago', 129661)

        self.assertFormatedDelta('84 hours, 10 minutes ago', 303002)

        # We handle when time steps the wrong direction because computers

        # don't have synchronized clocks.

        self.assertFormatedDelta('84 hours, 10 minutes in the future', -303002)

        self.assertFormatedDelta('1 second in the future', -1)

        self.assertFormatedDelta('2 seconds in the future', -2)

    def test_format_date(self):

        self.assertRaises(errors.UnsupportedTimezoneFormat,

            osutils.format_date, 0, timezone='foo')

    def test_dereference_path(self):

        self.requireFeature(SymlinkFeature)

        cwd = osutils.realpath('.')

        os.mkdir('bar')

        bar_path = osutils.pathjoin(cwd, 'bar')

        # Using './' to avoid bug #1213894 (first path component not

        # dereferenced) in Python 2.4.1 and earlier

        self.assertEqual(bar_path, osutils.realpath('./bar'))

        os.symlink('bar', 'foo')

        self.assertEqual(bar_path, osutils.realpath('./foo'))

        # Does not dereference terminal symlinks

        foo_path = osutils.pathjoin(cwd, 'foo')

        self.assertEqual(foo_path, osutils.dereference_path('./foo'))

        # Dereferences parent symlinks

        os.mkdir('bar/baz')

        baz_path = osutils.pathjoin(bar_path, 'baz')

        self.assertEqual(baz_path, osutils.dereference_path('./foo/baz'))

        # Dereferences parent symlinks that are the first path element

        self.assertEqual(baz_path, osutils.dereference_path('foo/baz'))

        # Dereferences parent symlinks in absolute paths

        foo_baz_path = osutils.pathjoin(foo_path, 'baz')

        self.assertEqual(baz_path, osutils.dereference_path(foo_baz_path))

    def test_changing_access(self):

        f = file('file', 'w')

        f.write('monkey')

        f.close()

        # Make a file readonly

        osutils.make_readonly('file')

        mode = os.lstat('file').st_mode

        self.assertEqual(mode, mode & 0777555)

        # Make a file writable

        osutils.make_writable('file')

        mode = os.lstat('file').st_mode

        self.assertEqual(mode, mode | 0200)

        if osutils.has_symlinks():

            # should not error when handed a symlink

            os.symlink('nonexistent', 'dangling')

            osutils.make_readonly('dangling')

            osutils.make_writable('dangling')

    def test_kind_marker(self):

        self.assertEqual("", osutils.kind_marker("file"))

        self.assertEqual("/", osutils.kind_marker(osutils._directory_kind))

        self.assertEqual("@", osutils.kind_marker("symlink"))

        self.assertRaises(errors.BzrError, osutils.kind_marker, "unknown")

    def test_host_os_dereferences_symlinks(self):

        osutils.host_os_dereferences_symlinks()

class TestPumpFile(TestCase):

    """Test pumpfile method."""

    def setUp(self):

        # create a test datablock

        self.block_size = 512

        pattern = '0123456789ABCDEF'

        self.test_data = pattern * (3 * self.block_size / len(pattern))

        self.test_data_len = len(self.test_data)

    def test_bracket_block_size(self):

        """Read data in blocks with the requested read size bracketing the

        block size."""

        # make sure test data is larger than max read size

        self.assertTrue(self.test_data_len > self.block_size)

        from_file = FakeReadFile(self.test_data)

        to_file = StringIO()

        # read (max / 2) bytes and verify read size wasn't affected

        num_bytes_to_read = self.block_size / 2

        pumpfile(from_file, to_file, num_bytes_to_read, self.block_size)

        self.assertEqual(from_file.get_max_read_size(), num_bytes_to_read)

        self.assertEqual(from_file.get_read_count(), 1)

        # read (max) bytes and verify read size wasn't affected

        num_bytes_to_read = self.block_size

        from_file.reset_read_count()

        pumpfile(from_file, to_file, num_bytes_to_read, self.block_size)

        self.assertEqual(from_file.get_max_read_size(), num_bytes_to_read)

        self.assertEqual(from_file.get_read_count(), 1)

        # read (max + 1) bytes and verify read size was limited

        num_bytes_to_read = self.block_size + 1

        from_file.reset_read_count()

        pumpfile(from_file, to_file, num_bytes_to_read, self.block_size)

        self.assertEqual(from_file.get_max_read_size(), self.block_size)

        self.assertEqual(from_file.get_read_count(), 2)

        # finish reading the rest of the data

        num_bytes_to_read = self.test_data_len - to_file.tell()

        pumpfile(from_file, to_file, num_bytes_to_read, self.block_size)

        # report error if the data wasn't equal (we only report the size due

        # to the length of the data)

        response_data = to_file.getvalue()

        if response_data != self.test_data:

            message = "Data not equal.  Expected %d bytes, received %d."

            self.fail(message % (len(response_data), self.test_data_len))

    def test_specified_size(self):

        """Request a transfer larger than the maximum block size and verify

        that the maximum read doesn't exceed the block_size."""

        # make sure test data is larger than max read size

        self.assertTrue(self.test_data_len > self.block_size)

        # retrieve data in blocks

        from_file = FakeReadFile(self.test_data)

        to_file = StringIO()

        pumpfile(from_file, to_file, self.test_data_len, self.block_size)

        # verify read size was equal to the maximum read size

        self.assertTrue(from_file.get_max_read_size() > 0)

        self.assertEqual(from_file.get_max_read_size(), self.block_size)

        self.assertEqual(from_file.get_read_count(), 3)

        # report error if the data wasn't equal (we only report the size due

        # to the length of the data)

        response_data = to_file.getvalue()

        if response_data != self.test_data:

            message = "Data not equal.  Expected %d bytes, received %d."

            self.fail(message % (len(response_data), self.test_data_len))

    def test_to_eof(self):

        """Read to end-of-file and verify that the reads are not larger than

        the maximum read size."""

        # make sure test data is larger than max read size

        self.assertTrue(self.test_data_len > self.block_size)

        # retrieve data to EOF

        from_file = FakeReadFile(self.test_data)

        to_file = StringIO()

        pumpfile(from_file, to_file, -1, self.block_size)

        # verify read size was equal to the maximum read size

        self.assertEqual(from_file.get_max_read_size(), self.block_size)

        self.assertEqual(from_file.get_read_count(), 4)

        # report error if the data wasn't equal (we only report the size due

        # to the length of the data)

        response_data = to_file.getvalue()

        if response_data != self.test_data:

            message = "Data not equal.  Expected %d bytes, received %d."

            self.fail(message % (len(response_data), self.test_data_len))

    def test_defaults(self):

        """Verifies that the default arguments will read to EOF -- this

        test verifies that any existing usages of pumpfile will not be broken

        with this new version."""

        # retrieve data using default (old) pumpfile method

        from_file = FakeReadFile(self.test_data)

        to_file = StringIO()

        pumpfile(from_file, to_file)

        # report error if the data wasn't equal (we only report the size due

        # to the length of the data)

        response_data = to_file.getvalue()

        if response_data != self.test_data:

            message = "Data not equal.  Expected %d bytes, received %d."

            self.fail(message % (len(response_data), self.test_data_len))

class TestSafeUnicode(TestCase):

    def test_from_ascii_string(self):

        self.assertEqual(u'foobar', osutils.safe_unicode('foobar'))

    def test_from_unicode_string_ascii_contents(self):

        self.assertEqual(u'bargam', osutils.safe_unicode(u'bargam'))

    def test_from_unicode_string_unicode_contents(self):

        self.assertEqual(u'bargam\xae', osutils.safe_unicode(u'bargam\xae'))

    def test_from_utf8_string(self):

        self.assertEqual(u'foo\xae', osutils.safe_unicode('foo\xc2\xae'))

    def test_bad_utf8_string(self):

        self.assertRaises(BzrBadParameterNotUnicode,

                          osutils.safe_unicode,

                          '\xbb\xbb')

class TestSafeUtf8(TestCase):

    def test_from_ascii_string(self):

        f = 'foobar'

        self.assertEqual('foobar', osutils.safe_utf8(f))

    def test_from_unicode_string_ascii_contents(self):

        self.assertEqual('bargam', osutils.safe_utf8(u'bargam'))

    def test_from_unicode_string_unicode_contents(self):

        self.assertEqual('bargam\xc2\xae', osutils.safe_utf8(u'bargam\xae'))

    def test_from_utf8_string(self):

        self.assertEqual('foo\xc2\xae', osutils.safe_utf8('foo\xc2\xae'))

    def test_bad_utf8_string(self):

        self.assertRaises(BzrBadParameterNotUnicode,

                          osutils.safe_utf8, '\xbb\xbb')

class TestSafeRevisionId(TestCase):

    def test_from_ascii_string(self):

        # this shouldn't give a warning because it's getting an ascii string

        self.assertEqual('foobar', osutils.safe_revision_id('foobar'))

    def test_from_unicode_string_ascii_contents(self):

        self.assertEqual('bargam',

                         osutils.safe_revision_id(u'bargam', warn=False))

    def test_from_unicode_deprecated(self):

        self.assertEqual('bargam',

            self.callDeprecated([osutils._revision_id_warning],

                                osutils.safe_revision_id, u'bargam'))

    def test_from_unicode_string_unicode_contents(self):

        self.assertEqual('bargam\xc2\xae',

                         osutils.safe_revision_id(u'bargam\xae', warn=False))

    def test_from_utf8_string(self):

        self.assertEqual('foo\xc2\xae',

                         osutils.safe_revision_id('foo\xc2\xae'))

    def test_none(self):

        """Currently, None is a valid revision_id"""

        self.assertEqual(None, osutils.safe_revision_id(None))

class TestSafeFileId(TestCase):

    def test_from_ascii_string(self):

        self.assertEqual('foobar', osutils.safe_file_id('foobar'))

    def test_from_unicode_string_ascii_contents(self):

        self.assertEqual('bargam', osutils.safe_file_id(u'bargam', warn=False))

    def test_from_unicode_deprecated(self):

        self.assertEqual('bargam',

            self.callDeprecated([osutils._file_id_warning],

                                osutils.safe_file_id, u'bargam'))

    def test_from_unicode_string_unicode_contents(self):

        self.assertEqual('bargam\xc2\xae',

                         osutils.safe_file_id(u'bargam\xae', warn=False))

    def test_from_utf8_string(self):

        self.assertEqual('foo\xc2\xae',

                         osutils.safe_file_id('foo\xc2\xae'))

    def test_none(self):

        """Currently, None is a valid revision_id"""

        self.assertEqual(None, osutils.safe_file_id(None))

class TestWin32Funcs(TestCase):

    """Test that the _win32 versions of os utilities return appropriate paths."""

    def test_abspath(self):

        self.assertEqual('C:/foo', osutils._win32_abspath('C:\\foo'))

        self.assertEqual('C:/foo', osutils._win32_abspath('C:/foo'))

        self.assertEqual('//HOST/path', osutils._win32_abspath(r'\\HOST\path'))

        self.assertEqual('//HOST/path', osutils._win32_abspath('//HOST/path'))

    def test_realpath(self):

        self.assertEqual('C:/foo', osutils._win32_realpath('C:\\foo'))

        self.assertEqual('C:/foo', osutils._win32_realpath('C:/foo'))

    def test_pathjoin(self):

        self.assertEqual('path/to/foo', osutils._win32_pathjoin('path', 'to', 'foo'))

        self.assertEqual('C:/foo', osutils._win32_pathjoin('path\\to', 'C:\\foo'))

        self.assertEqual('C:/foo', osutils._win32_pathjoin('path/to', 'C:/foo'))

        self.assertEqual('path/to/foo', osutils._win32_pathjoin('path/to/', 'foo'))

        self.assertEqual('/foo', osutils._win32_pathjoin('C:/path/to/', '/foo'))

        self.assertEqual('/foo', osutils._win32_pathjoin('C:\\path\\to\\', '\\foo'))

    def test_normpath(self):

        self.assertEqual('path/to/foo', osutils._win32_normpath(r'path\\from\..\to\.\foo'))

        self.assertEqual('path/to/foo', osutils._win32_normpath('path//from/../to/./foo'))

    def test_getcwd(self):

        cwd = osutils._win32_getcwd()

        os_cwd = os.getcwdu()

        self.assertEqual(os_cwd[1:].replace('\\', '/'), cwd[1:])

        # win32 is inconsistent whether it returns lower or upper case

        # and even if it was consistent the user might type the other

        # so we force it to uppercase

        # running python.exe under cmd.exe return capital C:\\

        # running win32 python inside a cygwin shell returns lowercase

        self.assertEqual(os_cwd[0].upper(), cwd[0])

    def test_fixdrive(self):

        self.assertEqual('H:/foo', osutils._win32_fixdrive('h:/foo'))

        self.assertEqual('H:/foo', osutils._win32_fixdrive('H:/foo'))

        self.assertEqual('C:\\foo', osutils._win32_fixdrive('c:\\foo'))

    def test_win98_abspath(self):

        # absolute path

        self.assertEqual('C:/foo', osutils._win98_abspath('C:\\foo'))

        self.assertEqual('C:/foo', osutils._win98_abspath('C:/foo'))

        # UNC path

        self.assertEqual('//HOST/path', osutils._win98_abspath(r'\\HOST\path'))

        self.assertEqual('//HOST/path', osutils._win98_abspath('//HOST/path'))

        # relative path

        cwd = osutils.getcwd().rstrip('/')

        drive = osutils._nt_splitdrive(cwd)[0]

        self.assertEqual(cwd+'/path', osutils._win98_abspath('path'))

        self.assertEqual(drive+'/path', osutils._win98_abspath('/path'))

        # unicode path

        u = u'\u1234'

        self.assertEqual(cwd+'/'+u, osutils._win98_abspath(u))

class TestWin32FuncsDirs(TestCaseInTempDir):

    """Test win32 functions that create files."""

    def test_getcwd(self):

        if win32utils.winver == 'Windows 98':

            raise TestSkipped('Windows 98 cannot handle unicode filenames')

        # Make sure getcwd can handle unicode filenames

        try:

            os.mkdir(u'mu-\xb5')

        except UnicodeError:

            raise TestSkipped("Unable to create Unicode filename")

        os.chdir(u'mu-\xb5')

        # TODO: jam 20060427 This will probably fail on Mac OSX because

        #       it will change the normalization of B\xe5gfors

        #       Consider using a different unicode character, or make

        #       osutils.getcwd() renormalize the path.

        self.assertEndsWith(osutils._win32_getcwd(), u'mu-\xb5')

    def test_minimum_path_selection(self):

        self.assertEqual(set(),

            osutils.minimum_path_selection([]))

        self.assertEqual(set(['a', 'b']),

            osutils.minimum_path_selection(['a', 'b']))

        self.assertEqual(set(['a/', 'b']),

            osutils.minimum_path_selection(['a/', 'b']))

        self.assertEqual(set(['a/', 'b']),

            osutils.minimum_path_selection(['a/c', 'a/', 'b']))

    def test_mkdtemp(self):

        tmpdir = osutils._win32_mkdtemp(dir='.')

        self.assertFalse('\\' in tmpdir)

    def test_rename(self):

        a = open('a', 'wb')

        a.write('foo\n')

        a.close()

        b = open('b', 'wb')

        b.write('baz\n')

        b.close()

        osutils._win32_rename('b', 'a')

        self.failUnlessExists('a')

        self.failIfExists('b')

        self.assertFileEqual('baz\n', 'a')

    def test_rename_missing_file(self):

        a = open('a', 'wb')

        a.write('foo\n')

        a.close()

        try:

            osutils._win32_rename('b', 'a')

        except (IOError, OSError), e:

            self.assertEqual(errno.ENOENT, e.errno)

        self.assertFileEqual('foo\n', 'a')