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bzrlib/tests/test_cache_utf8.py
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# Copyright (C) 2006 Canonical Ltd
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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"""Tests for utf8 caching."""
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from bzrlib import (
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    cache_utf8,
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    )
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from bzrlib.tests import TestCase
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class TestEncodeCache(TestCase):
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    def setUp(self):
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        super(TestEncodeCache, self).setUp()
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        cache_utf8.clear_encoding_cache()
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        self.addCleanup(cache_utf8.clear_encoding_cache)
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    def check_encode(self, rev_id):
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        rev_id_utf8 = rev_id.encode('utf-8')
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        self.failIf(rev_id in cache_utf8._unicode_to_utf8_map)
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        self.failIf(rev_id_utf8 in cache_utf8._utf8_to_unicode_map)
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        # After a single encode, the mapping should exist for
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        # both directions
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        self.assertEqual(rev_id_utf8, cache_utf8.encode(rev_id))
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        self.failUnless(rev_id in cache_utf8._unicode_to_utf8_map)
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        self.failUnless(rev_id_utf8 in cache_utf8._utf8_to_unicode_map)
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        self.assertEqual(rev_id, cache_utf8.decode(rev_id_utf8))
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        cache_utf8.clear_encoding_cache()
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        self.failIf(rev_id in cache_utf8._unicode_to_utf8_map)
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        self.failIf(rev_id_utf8 in cache_utf8._utf8_to_unicode_map)
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    def check_decode(self, rev_id):
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        rev_id_utf8 = rev_id.encode('utf-8')
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        self.failIf(rev_id in cache_utf8._unicode_to_utf8_map)
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        self.failIf(rev_id_utf8 in cache_utf8._utf8_to_unicode_map)
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        # After a single decode, the mapping should exist for
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        # both directions
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        self.assertEqual(rev_id, cache_utf8.decode(rev_id_utf8))
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        self.failUnless(rev_id in cache_utf8._unicode_to_utf8_map)
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        self.failUnless(rev_id_utf8 in cache_utf8._utf8_to_unicode_map)
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        self.assertEqual(rev_id_utf8, cache_utf8.encode(rev_id))
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        cache_utf8.clear_encoding_cache()
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        self.failIf(rev_id in cache_utf8._unicode_to_utf8_map)
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        self.failIf(rev_id_utf8 in cache_utf8._utf8_to_unicode_map)
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    def test_ascii(self):
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        self.check_decode(u'all_ascii_characters123123123')
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        self.check_encode(u'all_ascii_characters123123123')
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    def test_unicode(self):
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        self.check_encode(u'some_\xb5_unicode_\xe5_chars')
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        self.check_decode(u'some_\xb5_unicode_\xe5_chars')
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    def test_cached_unicode(self):
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        x = u'\xb5yy' + u'\xe5zz'
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        y = u'\xb5yy' + u'\xe5zz'
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        self.failIf(x is y)
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        xp = cache_utf8.get_cached_unicode(x)
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        yp = cache_utf8.get_cached_unicode(y)
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        self.assertIs(xp, x)
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        self.assertIs(xp, yp)
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    def test_cached_utf8(self):
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        x = u'\xb5yy\xe5zz'.encode('utf8')
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        y = u'\xb5yy\xe5zz'.encode('utf8')
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        self.failIf(x is y)
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        xp = cache_utf8.get_cached_utf8(x)
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        yp = cache_utf8.get_cached_utf8(y)
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        self.assertIs(xp, x)
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        self.assertIs(xp, yp)
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    def test_cached_ascii(self):
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        x = '%s %s' % ('simple', 'text')
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        y = '%s %s' % ('simple', 'text')
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        self.failIf(x is y)
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        xp = cache_utf8.get_cached_ascii(x)
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        yp = cache_utf8.get_cached_ascii(y)
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        self.assertIs(xp, x)
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        self.assertIs(xp, yp)
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        # after caching, encode and decode should also return the right
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        # objects.
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        uni_x = cache_utf8.decode(x)
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        self.assertEqual(u'simple text', uni_x)
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        self.assertIsInstance(uni_x, unicode)
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        utf8_x = cache_utf8.encode(uni_x)
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        self.assertIs(utf8_x, x)
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    def test_decode_with_None(self):
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        self.assertEqual(None, cache_utf8._utf8_decode_with_None(None))
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        self.assertEqual(u'foo', cache_utf8._utf8_decode_with_None('foo'))
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        self.assertEqual(u'f\xb5',
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                         cache_utf8._utf8_decode_with_None('f\xc2\xb5'))