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bzrlib/tests/test_revision.py
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class TestCommonAncestor(TestCaseWithTransport):
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    """Test checking whether a revision is an ancestor of another revision"""
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    def test_old_common_ancestor(self):
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        """Pick a resonable merge base using the old functionality"""
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        from bzrlib.revision import old_common_ancestor as common_ancestor
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        br1, br2 = make_branches(self)
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        revisions = br1.revision_history()
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        revisions_2 = br2.revision_history()
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        sources = br1.repository
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        expected_ancestors_list = {revisions[3]:(0, 0), 
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                                   revisions[2]:(1, 1),
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                                   revisions_2[4]:(2, 1), 
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                                   revisions[1]:(3, 2),
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                                   revisions_2[3]:(4, 2),
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                                   revisions[0]:(5, 3) }
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        ancestors_list = find_present_ancestors(revisions[3], sources)
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        self.assertEquals(len(expected_ancestors_list), len(ancestors_list))
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        for key, value in expected_ancestors_list.iteritems():
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            self.assertEqual(ancestors_list[key], value, 
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                              "key %r, %r != %r" % (key, ancestors_list[key],
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                                                    value))
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        self.assertEqual(common_ancestor(revisions[0], revisions[0], sources),
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                          revisions[0])
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        self.assertEqual(common_ancestor(revisions[1], revisions[2], sources),
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                          revisions[1])
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        self.assertEqual(common_ancestor(revisions[1], revisions[1], sources),
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                          revisions[1])
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        self.assertEqual(common_ancestor(revisions[2], revisions_2[4], sources),
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                          revisions[2])
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        self.assertEqual(common_ancestor(revisions[3], revisions_2[4], sources),
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                          revisions_2[4])
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        self.assertEqual(common_ancestor(revisions[4], revisions_2[5], sources),
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                          revisions_2[4])
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        br1.fetch(br2)
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        self.assertEqual(common_ancestor(revisions[5], revisions_2[6], sources),
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                          revisions[4]) # revisions_2[5] is equally valid
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        self.assertEqual(common_ancestor(revisions_2[6], revisions[5], sources),
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                          revisions_2[5])
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    def test_common_ancestor(self):
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        """Pick a reasonable merge base"""
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        from bzrlib.revision import common_ancestor