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bzrlib/tests/branch_implementations/test_update.py
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        master_tree.commit('bar', rev_id='bar', allow_pointless=True)
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        self.assertEqual('foo', child_tree.branch.update())
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        self.assertEqual(['bar'], child_tree.branch.revision_history())
 
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class TestUpdateRevisions(TestCaseWithBranch):
 
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    def test_accepts_graph(self):
 
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        # An implementation may not use it, but it should allow a 'graph' to be
 
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        # supplied
 
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        tree1 = self.make_branch_and_tree('tree1')
 
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        rev1 = tree1.commit('one')
 
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        tree2 = tree1.bzrdir.sprout('tree2').open_workingtree()
 
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        rev2 = tree2.commit('two')
 
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        tree1.lock_write()
 
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        self.addCleanup(tree1.unlock)
 
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        tree2.lock_read()
 
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        self.addCleanup(tree2.unlock)
 
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        graph = tree2.branch.repository.get_graph(tree1.branch.repository)
 
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        tree1.branch.update_revisions(tree2.branch, graph=graph)
 
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        self.assertEqual((2, rev2), tree1.branch.last_revision_info())
 
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    def test_overwrite_ignores_diverged(self):
 
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        tree1 = self.make_branch_and_tree('tree1')
 
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        rev1 = tree1.commit('one')
 
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        tree2 = tree1.bzrdir.sprout('tree2').open_workingtree()
 
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        rev2 = tree1.commit('two')
 
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        rev2b = tree2.commit('alt two')
 
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        self.assertRaises(errors.DivergedBranches,
 
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                          tree1.branch.update_revisions,
 
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                          tree2.branch, overwrite=False)
 
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        # However, the revision should be copied into the repository
 
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        self.assertTrue(tree1.branch.repository.has_revision(rev2b))
 
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        tree1.branch.update_revisions(tree2.branch, overwrite=True)
 
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        self.assertEqual((2, rev2b), tree1.branch.last_revision_info())
 
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    def test_ignores_older_unless_overwrite(self):
 
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        tree1 = self.make_branch_and_tree('tree1')
 
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        rev1 = tree1.commit('one')
 
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        tree2 = tree1.bzrdir.sprout('tree2').open_workingtree()
 
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        rev2 = tree1.commit('two')
 
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        tree1.branch.update_revisions(tree2.branch)
 
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        self.assertEqual((2, rev2), tree1.branch.last_revision_info())
 
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        tree1.branch.update_revisions(tree2.branch, overwrite=True)
 
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        self.assertEqual((1, rev1), tree1.branch.last_revision_info())