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https://launchpad.net/bugs/524184
NEWS section template into a separate file

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bzrlib/tests/test_revert.py
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# Copyright (C) 2006 Canonical Ltd
 
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# Copyright (C) 2006, 2007, 2009, 2010 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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#
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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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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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import os
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        source_tree.commit('added dir')
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        target_tree.lock_write()
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        self.addCleanup(target_tree.unlock)
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        merge.merge_inner(target_tree.branch, source_tree.basis_tree(), 
 
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        merge.merge_inner(target_tree.branch, source_tree.basis_tree(),
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                          target_tree.basis_tree(), this_tree=target_tree)
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        self.failUnlessExists('target/dir')
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        self.failUnlessExists('target/dir/contents')
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        tree.commit('add new_file')
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        tree.revert(old_tree=basis_tree)
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        self.failIfExists('tree/new_file')
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        # files should be deleted if their changes came from merges
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        merge_target.merge_from_branch(tree.branch)
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        self.failUnlessExists('merge_target/new_file')
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        self.failUnlessExists('dir/file1')
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        self.failIfExists('dir/file2')
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        self.assertEqual('dir-id', tree.path2id('dir'))
 
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    def test_revert_root_id_change(self):
 
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        tree = self.make_branch_and_tree('.')
 
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        tree.set_root_id('initial-root-id')
 
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        self.build_tree(['file1'])
 
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        tree.add(['file1'])
 
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        tree.commit('first')
 
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        tree.set_root_id('temp-root-id')
 
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        self.assertEqual('temp-root-id', tree.get_root_id())
 
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        tree.revert()
 
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        self.assertEqual('initial-root-id', tree.get_root_id())