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import unittest
from altgraph import GraphUtil
from altgraph import Graph, GraphError
class TestGraphUtil (unittest.TestCase):
def test_generate_random(self):
g = GraphUtil.generate_random_graph(10, 50)
self.assertEqual(g.number_of_nodes(), 10)
self.assertEqual(g.number_of_edges(), 50)
seen = set()
for e in g.edge_list():
h, t = g.edge_by_id(e)
self.assertFalse(h == t)
self.assertTrue((h, t) not in seen)
seen.add((h, t))
g = GraphUtil.generate_random_graph(5, 30, multi_edges=True)
self.assertEqual(g.number_of_nodes(), 5)
self.assertEqual(g.number_of_edges(), 30)
seen = set()
for e in g.edge_list():
h, t = g.edge_by_id(e)
self.assertFalse(h == t)
if (h, t) in seen:
break
seen.add((h, t))
else:
self.fail("no duplicates?")
g = GraphUtil.generate_random_graph(5, 21, self_loops=True)
self.assertEqual(g.number_of_nodes(), 5)
self.assertEqual(g.number_of_edges(), 21)
seen = set()
for e in g.edge_list():
h, t = g.edge_by_id(e)
self.assertFalse((h, t) in seen)
if h == t:
break
seen.add((h, t))
else:
self.fail("no self loops?")
self.assertRaises(GraphError, GraphUtil.generate_random_graph, 5, 21)
g = GraphUtil.generate_random_graph(5, 21, True)
self.assertRaises(GraphError, GraphUtil.generate_random_graph, 5, 26, True)
def test_generate_scale_free(self):
graph = GraphUtil.generate_scale_free_graph(50, 10)
self.assertEqual(graph.number_of_nodes(), 500)
counts = {}
for node in graph:
degree = graph.inc_degree(node)
try:
counts[degree] += 1
except KeyError:
counts[degree] = 1
total_counts = sum(counts.values())
P = {}
for degree, count in counts.items():
P[degree] = count * 1.0 / total_counts
# XXX: use algoritm <http://stackoverflow.com/questions/3433486/how-to-do-exponential-and-logarithmic-curve-fitting-in-python-i-found-only-polyn>
# to check if P[degree] ~ degree ** G (for some G)
#print sorted(P.items())
#print sorted([(count, degree) for degree, count in counts.items()])
#self.fail("missing tests for GraphUtil.generate_scale_free_graph")
def test_filter_stack(self):
g = Graph.Graph()
g.add_node("1", "N.1")
g.add_node("1.1", "N.1.1")
g.add_node("1.1.1", "N.1.1.1")
g.add_node("1.1.2", "N.1.1.2")
g.add_node("1.1.3", "N.1.1.3")
g.add_node("1.1.1.1", "N.1.1.1.1")
g.add_node("1.1.1.2", "N.1.1.1.2")
g.add_node("1.1.2.1", "N.1.1.2.1")
g.add_node("1.1.2.2", "N.1.1.2.2")
g.add_node("1.1.2.3", "N.1.1.2.3")
g.add_node("2", "N.2")
g.add_edge("1", "1.1")
g.add_edge("1.1", "1.1.1")
g.add_edge("1.1", "1.1.2")
g.add_edge("1.1", "1.1.3")
g.add_edge("1.1.1", "1.1.1.1")
g.add_edge("1.1.1", "1.1.1.2")
g.add_edge("1.1.2", "1.1.2.1")
g.add_edge("1.1.2", "1.1.2.2")
g.add_edge("1.1.2", "1.1.2.3")
v, r, o = GraphUtil.filter_stack(g, "1", [
lambda n: n != "N.1.1.1", lambda n: n != "N.1.1.2.3" ])
self.assertEqual(v,
set(["1", "1.1", "1.1.1", "1.1.2", "1.1.3",
"1.1.1.1", "1.1.1.2", "1.1.2.1", "1.1.2.2",
"1.1.2.3"]))
self.assertEqual(r, set([
"1.1.1", "1.1.2.3"]))
o.sort()
self.assertEqual(o,
[
("1.1", "1.1.1.1"),
("1.1", "1.1.1.2")
])
v, r, o = GraphUtil.filter_stack(g, "1", [
lambda n: n != "N.1.1.1", lambda n: n != "N.1.1.1.2" ])
self.assertEqual(v,
set(["1", "1.1", "1.1.1", "1.1.2", "1.1.3",
"1.1.1.1", "1.1.1.2", "1.1.2.1", "1.1.2.2",
"1.1.2.3"]))
self.assertEqual(r, set([
"1.1.1", "1.1.1.2"]))
self.assertEqual(o,
[
("1.1", "1.1.1.1"),
])
if __name__ == "__main__": # pragma: no cover
unittest.main()
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