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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')
self.assert_(nodes[1] in ('N', 'C'))
self.assert_(nodes[2] in ('N', 'C'))
self.assert_(nodes[3] in ('B', 'M'))
self.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)
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