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Late bind to PatienceSequenceMatcher to allow plugin to override.

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bzrlib/tests/test_tree.py
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# Copyright (C) 2006 by 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 Tree and InterTree."""
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from bzrlib.tests import TestCaseWithTransport
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from bzrlib.tree import InterTree
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class TestInterTree(TestCaseWithTransport):
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    def test_revision_tree_revision_tree(self):
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        # we should have an InterTree registered for RevisionTree to
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        # RevisionTree.
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        tree = self.make_branch_and_tree('.')
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        rev_id = tree.commit('first post')
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        rev_id2 = tree.commit('second post', allow_pointless=True)
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        rev_tree = tree.branch.repository.revision_tree(rev_id)
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        rev_tree2 = tree.branch.repository.revision_tree(rev_id2)
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        optimiser = InterTree.get(rev_tree, rev_tree2)
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        self.assertIsInstance(optimiser, InterTree)
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        optimiser = InterTree.get(rev_tree2, rev_tree)
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        self.assertIsInstance(optimiser, InterTree)
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    def test_working_tree_revision_tree(self):
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        # we should have an InterTree available for WorkingTree to 
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        # RevisionTree.
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        tree = self.make_branch_and_tree('.')
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        rev_id = tree.commit('first post')
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        rev_tree = tree.branch.repository.revision_tree(rev_id)
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        optimiser = InterTree.get(rev_tree, tree)
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        self.assertIsInstance(optimiser, InterTree)
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        optimiser = InterTree.get(tree, rev_tree)
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        self.assertIsInstance(optimiser, InterTree)
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    def test_working_tree_working_tree(self):
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        # we should have an InterTree available for WorkingTree to 
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        # WorkingTree.
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        tree = self.make_branch_and_tree('1')
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        tree2 = self.make_branch_and_tree('2')
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        optimiser = InterTree.get(tree, tree2)
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        self.assertIsInstance(optimiser, InterTree)
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        optimiser = InterTree.get(tree2, tree)
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        self.assertIsInstance(optimiser, InterTree)
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class RecordingOptimiser(InterTree):
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    calls = []
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    def compare(self, want_unchanged=False, specific_files=None,
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        extra_trees=None, require_versioned=False):
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        self.calls.append(
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            ('compare', self.source, self.target, want_unchanged,
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             specific_files, extra_trees, require_versioned)
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            )
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    @classmethod
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    def is_compatible(klass, source, target):
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        return True
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class TestTree(TestCaseWithTransport):
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    def test_compare_calls_InterTree_compare(self):
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        """This test tests the way Tree.compare() uses InterTree."""
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        old_optimisers = InterTree._optimisers
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        try:
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            InterTree._optimisers = set()
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            RecordingOptimiser.calls = []
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            InterTree.register_optimiser(RecordingOptimiser)
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            tree = self.make_branch_and_tree('1')
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            tree2 = self.make_branch_and_tree('2')
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            # do a series of calls:
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            # trivial usage
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            tree.changes_from(tree2)
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            # pass in all optional arguments by position
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            tree.changes_from(tree2, 'unchanged', 'specific', 'extra', 'require')
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            # pass in all optional arguments by keyword
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            tree.changes_from(tree2,
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                specific_files='specific',
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                want_unchanged='unchanged',
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                extra_trees='extra',
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                require_versioned='require',
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                )
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        finally:
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            InterTree._optimisers = old_optimisers
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        self.assertEqual(
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            [
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             ('compare', tree2, tree, False, None, None, False),
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             ('compare', tree2, tree, 'unchanged', 'specific', 'extra', 'require'),
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             ('compare', tree2, tree, 'unchanged', 'specific', 'extra', 'require'),
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            ], RecordingOptimiser.calls)