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import random
import unittest
from igraph import Graph, set_random_number_generator
class FakeRNG:
@staticmethod
def random():
return 0.1
@staticmethod
def randint(a, b):
return a
@staticmethod
def gauss(mu, sigma):
return 0.3
class InvalidRNG:
pass
class RandomNumberGeneratorTests(unittest.TestCase):
def tearDown(self):
set_random_number_generator(random)
def testSetRandomNumberGenerator(self):
set_random_number_generator(FakeRNG)
graph = Graph.GRG(10, 0.2)
self.assertEqual(graph.vs["x"], [0.1] * 10)
self.assertEqual(graph.vs["y"], [0.1] * 10)
self.assertRaises(AttributeError, set_random_number_generator, InvalidRNG)
def testSeeding(self):
state = random.getstate()
g1 = Graph.Erdos_Renyi(n=1000, m=5000)
random.setstate(state)
g2 = Graph.Erdos_Renyi(n=1000, m=5000)
self.assertTrue(g1.get_edgelist() == g2.get_edgelist())
def suite():
random_suite = unittest.defaultTestLoader.loadTestsFromTestCase(
RandomNumberGeneratorTests
)
return unittest.TestSuite([random_suite])
def test():
runner = unittest.TextTestRunner()
runner.run(suite())
if __name__ == "__main__":
test()
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