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# Copyright (C) 2008, 2009 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
"""Tests for the pyrex extension of groupcompress"""
from bzrlib import tests
from bzrlib import groupcompress
class _CompiledGroupCompress(tests.Feature):
def _probe(self):
try:
import bzrlib._groupcompress_pyx
except ImportError:
return False
else:
return True
def feature_name(self):
return 'bzrlib._groupcompress_pyx'
CompiledGroupCompress = _CompiledGroupCompress()
_text1 = """\
This is a bit
of source text
which is meant to be matched
against other text
"""
_text2 = """\
This is a bit
of source text
which is meant to differ from
against other text
"""
_text3 = """\
This is a bit
of source text
which is meant to be matched
against other text
except it also
has a lot more data
at the end of the file
"""
_first_text = """\
a bit of text, that
does not have much in
common with the next text
"""
_second_text = """\
some more bit of text, that
does not have much in
common with the previous text
and has some extra text
"""
_third_text = """\
a bit of text, that
has some in common with the previous text
and has some extra text
and not have much in
common with the next text
"""
_fourth_text = """\
123456789012345
same rabin hash
123456789012345
same rabin hash
123456789012345
same rabin hash
123456789012345
same rabin hash
"""
class Test_GroupCompress(tests.TestCase):
"""Direct tests for the compiled extension."""
def setUp(self):
super(Test_GroupCompress, self).setUp()
self.requireFeature(CompiledGroupCompress)
from bzrlib import _groupcompress_pyx
self._gc_module = _groupcompress_pyx
class TestMakeAndApplyDelta(Test_GroupCompress):
def setUp(self):
super(TestMakeAndApplyDelta, self).setUp()
self.make_delta = self._gc_module.make_delta
self.apply_delta = self._gc_module.apply_delta
def test_make_delta_is_typesafe(self):
self.make_delta('a string', 'another string')
self.assertRaises(TypeError,
self.make_delta, 'a string', object())
self.assertRaises(TypeError,
self.make_delta, 'a string', u'not a string')
self.assertRaises(TypeError,
self.make_delta, object(), 'a string')
self.assertRaises(TypeError,
self.make_delta, u'not a string', 'a string')
def test_make_noop_delta(self):
ident_delta = self.make_delta(_text1, _text1)
self.assertEqual('MM\x90M', ident_delta)
ident_delta = self.make_delta(_text2, _text2)
self.assertEqual('NN\x90N', ident_delta)
ident_delta = self.make_delta(_text3, _text3)
self.assertEqual('\x87\x01\x87\x01\x90\x87', ident_delta)
def test_make_delta(self):
delta = self.make_delta(_text1, _text2)
self.assertEqual('MN\x90/\x1fdiffer from\nagainst other text\n', delta)
delta = self.make_delta(_text2, _text1)
self.assertEqual('NM\x90/\x1ebe matched\nagainst other text\n', delta)
delta = self.make_delta(_text3, _text1)
self.assertEqual('\x87\x01M\x90M', delta)
delta = self.make_delta(_text3, _text2)
self.assertEqual('\x87\x01N\x90/\x1fdiffer from\nagainst other text\n',
delta)
def test_apply_delta_is_typesafe(self):
self.apply_delta(_text1, 'MM\x90M')
self.assertRaises(TypeError,
self.apply_delta, object(), 'MM\x90M')
self.assertRaises(TypeError,
self.apply_delta, unicode(_text1), 'MM\x90M')
self.assertRaises(TypeError,
self.apply_delta, _text1, u'MM\x90M')
self.assertRaises(TypeError,
self.apply_delta, _text1, object())
def test_apply_delta(self):
target = self.apply_delta(_text1,
'MN\x90/\x1fdiffer from\nagainst other text\n')
self.assertEqual(_text2, target)
target = self.apply_delta(_text2,
'NM\x90/\x1ebe matched\nagainst other text\n')
self.assertEqual(_text1, target)
class TestDeltaIndex(Test_GroupCompress):
def test_repr(self):
di = self._gc_module.DeltaIndex('test text\n')
self.assertEqual('DeltaIndex(1, 10)', repr(di))
def test_make_delta(self):
di = self._gc_module.DeltaIndex(_text1)
delta = di.make_delta(_text2)
self.assertEqual('MN\x90/\x1fdiffer from\nagainst other text\n', delta)
def test_delta_against_multiple_sources(self):
di = self._gc_module.DeltaIndex()
di.add_source(_first_text, 0)
self.assertEqual(len(_first_text), di._source_offset)
di.add_source(_second_text, 0)
self.assertEqual(len(_first_text) + len(_second_text), di._source_offset)
delta = di.make_delta(_third_text)
result = self._gc_module.apply_delta(_first_text + _second_text, delta)
self.assertEqualDiff(_third_text, result)
self.assertEqual('\xac\x01\x85\x01\x90\x14\x0chas some in '
'\x91v6\x03and\x91d"\x91:\n', delta)
def test_delta_with_offsets(self):
di = self._gc_module.DeltaIndex()
di.add_source(_first_text, 5)
self.assertEqual(len(_first_text) + 5, di._source_offset)
di.add_source(_second_text, 10)
self.assertEqual(len(_first_text) + len(_second_text) + 15,
di._source_offset)
delta = di.make_delta(_third_text)
self.assertIsNot(None, delta)
result = self._gc_module.apply_delta(
'12345' + _first_text + '1234567890' + _second_text, delta)
self.assertIsNot(None, result)
self.assertEqualDiff(_third_text, result)
self.assertEqual('\xbb\x01\x85\x01\x91\x05\x14\x0chas some in '
'\x91\x856\x03and\x91s"\x91?\n', delta)
def test_delta_with_delta_bytes(self):
di = self._gc_module.DeltaIndex()
source = _first_text
di.add_source(_first_text, 0)
self.assertEqual(len(_first_text), di._source_offset)
delta = di.make_delta(_second_text)
self.assertEqual('Dh\tsome more\x91\x019'
'&previous text\nand has some extra text\n', delta)
di.add_delta_source(delta, 0)
source += delta
self.assertEqual(len(_first_text) + len(delta), di._source_offset)
second_delta = di.make_delta(_third_text)
result = self._gc_module.apply_delta(source, second_delta)
self.assertEqualDiff(_third_text, result)
# We should be able to match against the 'previous text\nand has some...'
# that was part of the delta bytes
# Note that we don't match the 'common with the', because it isn't long
# enough to match in the original text, and those bytes are not present
# in the delta for the second text.
self.assertEqual('z\x85\x01\x90\x14\x1chas some in common with the '
'\x91T&\x03and\x91\x18,', second_delta)
# Add this delta, and create a new delta for the same text. We should
# find the remaining text, and only insert the short 'and' text.
di.add_delta_source(second_delta, 0)
source += second_delta
third_delta = di.make_delta(_third_text)
result = self._gc_module.apply_delta(source, third_delta)
self.assertEqualDiff(_third_text, result)
self.assertEqual('\xa6\x01\x85\x01\x90\x14\x91\x80\x1c'
'\x91T&\x03and\x91\x18,', third_delta)
# Now create a delta, which we know won't be able to be 'fit' into the
# existing index
fourth_delta = di.make_delta(_fourth_text)
self.assertEqual(_fourth_text,
self._gc_module.apply_delta(source, fourth_delta))
self.assertEqual('\xa6\x01\x80\x01'
'\x7f123456789012345\nsame rabin hash\n'
'123456789012345\nsame rabin hash\n'
'123456789012345\nsame rabin hash\n'
'123456789012345\nsame rabin hash'
'\x01\n', fourth_delta)
di.add_delta_source(fourth_delta, 0)
source += fourth_delta
# With the next delta, everything should be found
fifth_delta = di.make_delta(_fourth_text)
self.assertEqual(_fourth_text,
self._gc_module.apply_delta(source, fifth_delta))
self.assertEqual('\xac\x02\x80\x01\x91\xab\x7f\x01\n', fifth_delta)
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