~bzr-pqm/bzr/bzr.dev

from bzrlib.selftest import TestCase

from bzrlib.graph import node_distances, nodes_by_distance

class TestBase(TestCase):

    def edge_add(self, *args):

        for start, end in zip(args[:-1], args[1:]):

            if start not in self.graph:

                self.graph[start] = {}

            if end not in self.graph:

                self.graph[end] = {}

            self.graph[start][end] = 1

    def setUp(self):

        TestCase.setUp(self)

        self.graph = {}

        self.edge_add('A', 'B', 'C', 'D')

        self.edge_add('A', 'E', 'F', 'C')

        self.edge_add('A', 'G', 'H', 'I', 'B')

        self.edge_add('A', 'J', 'K', 'L', 'M', 'N')

        self.edge_add('O', 'N')

    def node_descendants(self):

        descendants = {'A':set()}

        for node in self.graph:

            for ancestor in self.graph[node]:

                if ancestor not in descendants:

                    descendants[ancestor] = set()

                descendants[ancestor].add(node)

        return descendants

    def test_distances(self):

        descendants = self.node_descendants()

        distances = node_distances(self.graph, descendants, 'A')

        nodes = nodes_by_distance(distances)

        self.assertEqual(nodes[0], 'D')

        assert nodes[1] in ('N', 'C')

        assert nodes[2] in ('N', 'C')

        assert nodes[3] in ('B', 'M')

        assert nodes[4] in ('B', 'M')

        #Ensure we don't shortcut through B when there's only a difference of

        # 1 in distance

        self.graph = {}

        self.edge_add('A', 'B', 'C')

        self.edge_add('A', 'D', 'E', 'C')

        descendants = self.node_descendants()

        distances = node_distances(self.graph, descendants, 'A')

        self.assertEqual(distances['C'], 3)