tests/test-simplemerge.py
author Augie Fackler <augie@google.com>
Sat, 05 Oct 2019 09:55:56 -0400
changeset 43049 6e8582ccf76d
parent 43010 d75142ef054a
child 43076 2372284d9457
permissions -rw-r--r--
discovery: re-wrap expression to avoid a black bug Differential Revision: https://phab.mercurial-scm.org/D6969
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# Copyright (C) 2004, 2005 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, see <http://www.gnu.org/licenses/>.
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from __future__ import absolute_import
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import unittest
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from mercurial import (
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    error,
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    simplemerge,
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    util,
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)
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from mercurial.utils import (
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    stringutil,
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)
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TestCase = unittest.TestCase
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# bzr compatible interface, for the tests
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class Merge3(simplemerge.Merge3Text):
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    """3-way merge of texts.
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    Given BASE, OTHER, THIS, tries to produce a combined text
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    incorporating the changes from both BASE->OTHER and BASE->THIS.
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    All three will typically be sequences of lines."""
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    def __init__(self, base, a, b):
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        basetext = b'\n'.join([i.strip(b'\n') for i in base] + [b''])
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        atext = b'\n'.join([i.strip(b'\n') for i in a] + [b''])
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        btext = b'\n'.join([i.strip(b'\n') for i in b] + [b''])
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        if (stringutil.binary(basetext) or stringutil.binary(atext)
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            or stringutil.binary(btext)):
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            raise error.Abort(b"don't know how to merge binary files")
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        simplemerge.Merge3Text.__init__(self, basetext, atext, btext,
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                                        base, a, b)
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CantReprocessAndShowBase = simplemerge.CantReprocessAndShowBase
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def split_lines(t):
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    return util.stringio(t).readlines()
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############################################################
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# test case data from the gnu diffutils manual
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# common base
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TZU = split_lines(b"""     The Nameless is the origin of Heaven and Earth;
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     The named is the mother of all things.
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     Therefore let there always be non-being,
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       so we may see their subtlety,
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     And let there always be being,
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       so we may see their outcome.
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     The two are the same,
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     But after they are produced,
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       they have different names.
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     They both may be called deep and profound.
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     Deeper and more profound,
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     The door of all subtleties!
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""")
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LAO = split_lines(b"""     The Way that can be told of is not the eternal Way;
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     The name that can be named is not the eternal name.
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     The Nameless is the origin of Heaven and Earth;
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     The Named is the mother of all things.
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     Therefore let there always be non-being,
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       so we may see their subtlety,
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     And let there always be being,
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       so we may see their outcome.
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     The two are the same,
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     But after they are produced,
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       they have different names.
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""")
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TAO = split_lines(b"""     The Way that can be told of is not the eternal Way;
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     The name that can be named is not the eternal name.
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     The Nameless is the origin of Heaven and Earth;
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     The named is the mother of all things.
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     Therefore let there always be non-being,
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       so we may see their subtlety,
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     And let there always be being,
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       so we may see their result.
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     The two are the same,
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     But after they are produced,
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       they have different names.
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       -- The Way of Lao-Tzu, tr. Wing-tsit Chan
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""")
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MERGED_RESULT = split_lines(b"""\
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     The Way that can be told of is not the eternal Way;
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     The name that can be named is not the eternal name.
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     The Nameless is the origin of Heaven and Earth;
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     The Named is the mother of all things.
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     Therefore let there always be non-being,
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       so we may see their subtlety,
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     And let there always be being,
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       so we may see their result.
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     The two are the same,
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     But after they are produced,
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       they have different names.\
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\n<<<<<<< LAO\
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\n=======
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       -- The Way of Lao-Tzu, tr. Wing-tsit Chan
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\
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\n>>>>>>> TAO
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""")
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class TestMerge3(TestCase):
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    def log(self, msg):
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        pass
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    def test_no_changes(self):
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        """No conflicts because nothing changed"""
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        m3 = Merge3([b'aaa', b'bbb'],
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                    [b'aaa', b'bbb'],
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                    [b'aaa', b'bbb'])
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        self.assertEqual(m3.find_unconflicted(),
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                         [(0, 2)])
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        self.assertEqual(list(m3.find_sync_regions()),
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                         [(0, 2,
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                           0, 2,
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                           0, 2),
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                          (2, 2,  2, 2,  2, 2)])
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        self.assertEqual(list(m3.merge_regions()),
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                         [(b'unchanged', 0, 2)])
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        self.assertEqual(list(m3.merge_groups()),
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                         [(b'unchanged', [b'aaa', b'bbb'])])
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    def test_front_insert(self):
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        m3 = Merge3([b'zz'],
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                    [b'aaa', b'bbb', b'zz'],
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                    [b'zz'])
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        # todo: should use a sentinel at end as from get_matching_blocks
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        # to match without zz
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        self.assertEqual(list(m3.find_sync_regions()),
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                         [(0, 1,  2, 3,  0, 1),
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                          (1, 1,  3, 3,  1, 1)])
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        self.assertEqual(list(m3.merge_regions()),
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                         [(b'a', 0, 2),
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                          (b'unchanged', 0, 1)])
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        self.assertEqual(list(m3.merge_groups()),
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                         [(b'a', [b'aaa', b'bbb']),
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                          (b'unchanged', [b'zz'])])
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    def test_null_insert(self):
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        m3 = Merge3([],
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                    [b'aaa', b'bbb'],
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                    [])
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        # todo: should use a sentinel at end as from get_matching_blocks
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        # to match without zz
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        self.assertEqual(list(m3.find_sync_regions()),
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                         [(0, 0,  2, 2,  0, 0)])
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        self.assertEqual(list(m3.merge_regions()),
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                         [(b'a', 0, 2)])
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        self.assertEqual(list(m3.merge_lines()),
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                         [b'aaa', b'bbb'])
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    def test_no_conflicts(self):
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        """No conflicts because only one side changed"""
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        m3 = Merge3([b'aaa', b'bbb'],
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                    [b'aaa', b'111', b'bbb'],
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                    [b'aaa', b'bbb'])
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        self.assertEqual(m3.find_unconflicted(),
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                         [(0, 1), (1, 2)])
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        self.assertEqual(list(m3.find_sync_regions()),
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                         [(0, 1,  0, 1,  0, 1),
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                          (1, 2,  2, 3,  1, 2),
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                          (2, 2,  3, 3,  2, 2)])
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        self.assertEqual(list(m3.merge_regions()),
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                         [(b'unchanged', 0, 1),
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                          (b'a', 1, 2),
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                          (b'unchanged', 1, 2)])
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    def test_append_a(self):
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        m3 = Merge3([b'aaa\n', b'bbb\n'],
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                    [b'aaa\n', b'bbb\n', b'222\n'],
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                    [b'aaa\n', b'bbb\n'])
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        self.assertEqual(b''.join(m3.merge_lines()),
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                         b'aaa\nbbb\n222\n')
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    def test_append_b(self):
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        m3 = Merge3([b'aaa\n', b'bbb\n'],
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                    [b'aaa\n', b'bbb\n'],
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                    [b'aaa\n', b'bbb\n', b'222\n'])
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        self.assertEqual(b''.join(m3.merge_lines()),
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                         b'aaa\nbbb\n222\n')
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    def test_append_agreement(self):
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        m3 = Merge3([b'aaa\n', b'bbb\n'],
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                    [b'aaa\n', b'bbb\n', b'222\n'],
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                    [b'aaa\n', b'bbb\n', b'222\n'])
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        self.assertEqual(b''.join(m3.merge_lines()),
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                         b'aaa\nbbb\n222\n')
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    def test_append_clash(self):
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        m3 = Merge3([b'aaa\n', b'bbb\n'],
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                    [b'aaa\n', b'bbb\n', b'222\n'],
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                    [b'aaa\n', b'bbb\n', b'333\n'])
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        ml = m3.merge_lines(name_a=b'a',
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                            name_b=b'b',
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                            start_marker=b'<<',
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                            mid_marker=b'--',
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                            end_marker=b'>>')
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        self.assertEqual(b''.join(ml),
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                         b'aaa\n'
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                         b'bbb\n'
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                         b'<< a\n'
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                         b'222\n'
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                         b'--\n'
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                         b'333\n'
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                         b'>> b\n'
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                         )
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    def test_insert_agreement(self):
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        m3 = Merge3([b'aaa\n', b'bbb\n'],
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                    [b'aaa\n', b'222\n', b'bbb\n'],
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                    [b'aaa\n', b'222\n', b'bbb\n'])
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        ml = m3.merge_lines(name_a=b'a',
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                            name_b=b'b',
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                            start_marker=b'<<',
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                            mid_marker=b'--',
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                            end_marker=b'>>')
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        self.assertEqual(b''.join(ml), b'aaa\n222\nbbb\n')
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    def test_insert_clash(self):
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        """Both try to insert lines in the same place."""
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        m3 = Merge3([b'aaa\n', b'bbb\n'],
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                    [b'aaa\n', b'111\n', b'bbb\n'],
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                    [b'aaa\n', b'222\n', b'bbb\n'])
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        self.assertEqual(m3.find_unconflicted(),
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                         [(0, 1), (1, 2)])
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        self.assertEqual(list(m3.find_sync_regions()),
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                         [(0, 1,  0, 1,  0, 1),
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                          (1, 2,  2, 3,  2, 3),
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                          (2, 2,  3, 3,  3, 3)])
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        self.assertEqual(list(m3.merge_regions()),
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                         [(b'unchanged', 0, 1),
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                          (b'conflict', 1, 1,  1, 2,  1, 2),
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                          (b'unchanged', 1, 2)])
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        self.assertEqual(list(m3.merge_groups()),
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                         [(b'unchanged', [b'aaa\n']),
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                          (b'conflict', [], [b'111\n'], [b'222\n']),
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                          (b'unchanged', [b'bbb\n']),
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                          ])
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        ml = m3.merge_lines(name_a=b'a',
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                            name_b=b'b',
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                            start_marker=b'<<',
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                            mid_marker=b'--',
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                            end_marker=b'>>')
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        self.assertEqual(b''.join(ml),
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b'''aaa
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<< a
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111
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--
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222
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>> b
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bbb
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''')
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    def test_replace_clash(self):
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        """Both try to insert lines in the same place."""
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        m3 = Merge3([b'aaa', b'000', b'bbb'],
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                    [b'aaa', b'111', b'bbb'],
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                    [b'aaa', b'222', b'bbb'])
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        self.assertEqual(m3.find_unconflicted(),
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                         [(0, 1), (2, 3)])
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        self.assertEqual(list(m3.find_sync_regions()),
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                         [(0, 1,  0, 1,  0, 1),
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                           (2, 3,  2, 3,  2, 3),
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                           (3, 3,  3, 3,  3, 3)])
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    def test_replace_multi(self):
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        """Replacement with regions of different size."""
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        m3 = Merge3([b'aaa', b'000', b'000', b'bbb'],
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                    [b'aaa', b'111', b'111', b'111', b'bbb'],
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                    [b'aaa', b'222', b'222', b'222', b'222', b'bbb'])
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        self.assertEqual(m3.find_unconflicted(),
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                         [(0, 1), (3, 4)])
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        self.assertEqual(list(m3.find_sync_regions()),
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                         [(0, 1,  0, 1,  0, 1),
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                          (3, 4,  4, 5,  5, 6),
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                          (4, 4,  5, 5,  6, 6)])
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    def test_merge_poem(self):
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        """Test case from diff3 manual"""
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        m3 = Merge3(TZU, LAO, TAO)
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        ml = list(m3.merge_lines(b'LAO', b'TAO'))
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        self.log(b'merge result:')
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        self.log(b''.join(ml))
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        self.assertEqual(ml, MERGED_RESULT)
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    def test_binary(self):
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        with self.assertRaises(error.Abort):
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            Merge3([b'\x00'], [b'a'], [b'b'])
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    def test_dos_text(self):
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        base_text = b'a\r\n'
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        this_text = b'b\r\n'
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        other_text = b'c\r\n'
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        m3 = Merge3(base_text.splitlines(True), other_text.splitlines(True),
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                    this_text.splitlines(True))
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        m_lines = m3.merge_lines(b'OTHER', b'THIS')
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        self.assertEqual(b'<<<<<<< OTHER\r\nc\r\n=======\r\nb\r\n'
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                         b'>>>>>>> THIS\r\n'.splitlines(True), list(m_lines))
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    def test_mac_text(self):
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        base_text = b'a\r'
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        this_text = b'b\r'
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        other_text = b'c\r'
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        m3 = Merge3(base_text.splitlines(True), other_text.splitlines(True),
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                    this_text.splitlines(True))
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        m_lines = m3.merge_lines(b'OTHER', b'THIS')
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        self.assertEqual(b'<<<<<<< OTHER\rc\r=======\rb\r'
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                         b'>>>>>>> THIS\r'.splitlines(True), list(m_lines))
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if __name__ == '__main__':
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    import silenttestrunner
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    silenttestrunner.main(__name__)