~bzr-pqm/bzr/bzr.dev

# Copyright (C) 2005, 2006 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 codecs

import locale

import os

import sys

import bzrlib

from bzrlib import (

    errors,

    osutils,

    )

from bzrlib.tests import (

        StringIOWrapper,

        TestCase, 

        TestSkipped,

        )

class FakeCodec(object):

    """Special class that helps testing over several non-existed encodings.

    Clients can add new encoding names, but because of how codecs is

    implemented they cannot be removed. Be careful with naming to avoid

    collisions between tests.

    """

    _registered = False

    _enabled_encodings = set()

    def add(self, encoding_name):

        """Adding encoding name to fake.

        :type   encoding_name:  lowercase plain string

        """

        if not self._registered:

            codecs.register(self)

            self._registered = True

        if encoding_name is not None:

            self._enabled_encodings.add(encoding_name)

    def __call__(self, encoding_name):

        """Called indirectly by codecs module during lookup"""

        if encoding_name in self._enabled_encodings:

            return codecs.lookup('latin-1')

fake_codec = FakeCodec()

class TestFakeCodec(TestCase):

    def test_fake_codec(self):

        self.assertRaises(LookupError, codecs.lookup, 'fake')

        fake_codec.add('fake')

        codecs.lookup('fake')

class TestTerminalEncoding(TestCase):

    """Test the auto-detection of proper terminal encoding."""

    def setUp(self):

        self._stdout = sys.stdout

        self._stderr = sys.stderr

        self._stdin = sys.stdin

        self._user_encoding = bzrlib.user_encoding

        self.addCleanup(self._reset)

    def make_wrapped_streams(self, 

                             stdout_encoding,

                             stderr_encoding,

                             stdin_encoding,

                             user_encoding='user_encoding',

                             enable_fake_encodings=True):

        sys.stdout = StringIOWrapper()

        sys.stdout.encoding = stdout_encoding

        sys.stderr = StringIOWrapper()

        sys.stderr.encoding = stderr_encoding

        sys.stdin = StringIOWrapper()

        sys.stdin.encoding = stdin_encoding

        bzrlib.user_encoding = user_encoding

        if enable_fake_encodings:

            fake_codec.add(stdout_encoding)

            fake_codec.add(stderr_encoding)

            fake_codec.add(stdin_encoding)

    def _reset(self):

        sys.stdout = self._stdout

        sys.stderr = self._stderr

        sys.stdin = self._stdin

        bzrlib.user_encoding = self._user_encoding

    def test_get_terminal_encoding(self):

        self.make_wrapped_streams('stdout_encoding',

                                  'stderr_encoding',

                                  'stdin_encoding')

        # first preference is stdout encoding

        self.assertEqual('stdout_encoding', osutils.get_terminal_encoding())

        sys.stdout.encoding = None

        # if sys.stdout is None, fall back to sys.stdin

        self.assertEqual('stdin_encoding', osutils.get_terminal_encoding())

        sys.stdin.encoding = None

        # and in the worst case, use bzrlib.user_encoding

        self.assertEqual('user_encoding', osutils.get_terminal_encoding())

    def test_terminal_cp0(self):

        # test cp0 encoding (Windows returns cp0 when there is no encoding)

        self.make_wrapped_streams('cp0',

                                  'cp0',

                                  'cp0',

                                  user_encoding='latin-1',

                                  enable_fake_encodings=False)

        # cp0 is invalid encoding. We should fall back to user_encoding

        self.assertEqual('latin-1', osutils.get_terminal_encoding())

        # check stderr

        self.assertEquals('', sys.stderr.getvalue())

    def test_terminal_cp_unknown(self):

        # test against really unknown encoding

        # catch warning at stderr

        self.make_wrapped_streams('cp-unknown',

                                  'cp-unknown',

                                  'cp-unknown',

                                  user_encoding='latin-1',

                                  enable_fake_encodings=False)

        self.assertEqual('latin-1', osutils.get_terminal_encoding())

        # check stderr

        self.assertEquals('bzr: warning: unknown terminal encoding cp-unknown.\n'

                          '  Using encoding latin-1 instead.\n', 

                          sys.stderr.getvalue())

class TestUserEncoding(TestCase):

    """Test detection of default user encoding."""

    def setUp(self):

        self._stderr = sys.stderr

        self._getpreferredencoding = locale.getpreferredencoding

        self.addCleanup(self._reset)

        sys.stderr = StringIOWrapper()

        # save $LANG

        self._LANG = os.environ.get('LANG')

    def _reset(self):

        locale.getpreferredencoding = self._getpreferredencoding

        sys.stderr = self._stderr

        # restore $LANG

        osutils.set_or_unset_env('LANG', self._LANG)

    def test_get_user_encoding(self):

        def f():

            return 'user_encoding'

        locale.getpreferredencoding = f

        fake_codec.add('user_encoding')

        self.assertEquals('user_encoding', osutils.get_user_encoding(use_cache=False))

        self.assertEquals('', sys.stderr.getvalue())

    def test_user_cp0(self):

        def f():

            return 'cp0'

        locale.getpreferredencoding = f

        self.assertEquals('ascii', osutils.get_user_encoding(use_cache=False))

        self.assertEquals('', sys.stderr.getvalue())

    def test_user_cp_unknown(self):

        def f():

            return 'cp-unknown'

        locale.getpreferredencoding = f

        self.assertEquals('ascii', osutils.get_user_encoding(use_cache=False))

        self.assertEquals('bzr: warning: unknown encoding cp-unknown.'

                          ' Continuing with ascii encoding.\n',

                          sys.stderr.getvalue())

    def test_user_locale_error(self):

        def f():

            raise locale.Error, 'unsupported locale'

        locale.getpreferredencoding = f

        os.environ['LANG'] = 'BOGUS'

        self.assertEquals('ascii', osutils.get_user_encoding(use_cache=False))

        self.assertEquals('bzr: warning: unsupported locale\n'

                          '  Could not determine what text encoding to use.\n'

                          '  This error usually means your Python interpreter\n'

                          '  doesn\'t support the locale set by $LANG (BOGUS)\n'

                          '  Continuing with ascii encoding.\n',

                          sys.stderr.getvalue())