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bzrlib/tests/test_graph.py
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from bzrlib.tests import TestCase
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from bzrlib.graph import node_distances, nodes_by_distance, Graph
 
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from bzrlib.graph import node_distances, nodes_by_distance
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class TestBase(TestCase):
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    def edge_add(self, *args):
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        for start, end in zip(args[:-1], args[1:]):
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            if start not in self.graph:
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        distances = node_distances(self.graph, descendants, 'A')
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        self.assertEqual(distances['C'], 3)
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class TestGraph(TestCase):
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    def test_get_descendants(self):
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        # Graph objects let you get a descendants graph in 
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        # node: {direct-children:distance} which contains
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        # known children, including ghost children
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        graph = Graph()
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        graph.add_ghost('ghost')
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        graph.add_node('rev1', ['ghost'])
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        # check the result contains ghosts:
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        self.assertEqual({'ghost': {'rev1': 1}, 'rev1': {}},
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                         graph.get_descendants())