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#!/usr/bin/env python
from nose.tools import *
from nose import SkipTest
import networkx as nx
def test_valid_degree_sequence1():
n = 100
p = .3
for i in range(10):
G = nx.erdos_renyi_graph(n,p)
deg = list(G.degree().values())
assert_true( nx.is_valid_degree_sequence(deg, method='eg') )
assert_true( nx.is_valid_degree_sequence(deg, method='hh') )
def test_valid_degree_sequence2():
n = 100
for i in range(10):
G = nx.barabasi_albert_graph(n,1)
deg = list(G.degree().values())
assert_true( nx.is_valid_degree_sequence(deg, method='eg') )
assert_true( nx.is_valid_degree_sequence(deg, method='hh') )
@raises(nx.NetworkXException)
def test_string_input():
a = nx.is_valid_degree_sequence([],'foo')
def test_negative_input():
assert_false(nx.is_valid_degree_sequence([-1],'hh'))
assert_false(nx.is_valid_degree_sequence([-1],'eg'))
assert_false(nx.is_valid_degree_sequence([72.5],'eg'))
class TestAtlas(object):
@classmethod
def setupClass(cls):
global atlas
import platform
if platform.python_implementation()=='Jython':
raise SkipTest('graph atlas not available under Jython.')
import networkx.generators.atlas as atlas
def setUp(self):
self.GAG=atlas.graph_atlas_g()
def test_atlas(self):
for graph in self.GAG:
deg = list(graph.degree().values())
assert_true( nx.is_valid_degree_sequence(deg, method='eg') )
assert_true( nx.is_valid_degree_sequence(deg, method='hh') )
def test_small_graph_true():
z=[5,3,3,3,3,2,2,2,1,1,1]
assert_true(nx.is_valid_degree_sequence(z, method='hh'))
assert_true(nx.is_valid_degree_sequence(z, method='eg'))
z=[10,3,3,3,3,2,2,2,2,2,2]
assert_true(nx.is_valid_degree_sequence(z, method='hh'))
assert_true(nx.is_valid_degree_sequence(z, method='eg'))
z=[1, 1, 1, 1, 1, 2, 2, 2, 3, 4]
assert_true(nx.is_valid_degree_sequence(z, method='hh'))
assert_true(nx.is_valid_degree_sequence(z, method='eg'))
def test_small_graph_false():
z=[1000,3,3,3,3,2,2,2,1,1,1]
assert_false(nx.is_valid_degree_sequence(z, method='hh'))
assert_false(nx.is_valid_degree_sequence(z, method='eg'))
z=[6,5,4,4,2,1,1,1]
assert_false(nx.is_valid_degree_sequence(z, method='hh'))
assert_false(nx.is_valid_degree_sequence(z, method='eg'))
z=[1, 1, 1, 1, 1, 1, 2, 2, 2, 3, 4]
assert_false(nx.is_valid_degree_sequence(z, method='hh'))
assert_false(nx.is_valid_degree_sequence(z, method='eg'))
def test_directed_degree_sequence():
# Test a range of valid directed degree sequences
n, r = 100, 10
p = 1.0 / r
for i in range(r):
G = nx.erdos_renyi_graph(n,p*(i+1),None,True)
din = list(G.in_degree().values())
dout = list(G.out_degree().values())
assert_true(nx.is_digraphical(din, dout))
def test_small_directed_sequences():
dout=[5,3,3,3,3,2,2,2,1,1,1]
din=[3,3,3,3,3,2,2,2,2,2,1]
assert_true(nx.is_digraphical(din, dout))
# Test nongraphical directed sequence
dout = [1000,3,3,3,3,2,2,2,1,1,1]
din=[103,102,102,102,102,102,102,102,102,102]
assert_false(nx.is_digraphical(din, dout))
# Test digraphical small sequence
dout=[1, 1, 1, 1, 1, 2, 2, 2, 3, 4]
din=[2, 2, 2, 2, 2, 2, 2, 2, 1, 1]
assert_true(nx.is_digraphical(din, dout))
# Test nonmatching sum
din=[2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1]
assert_false(nx.is_digraphical(din, dout))
# Test for negative integer in sequence
din=[2, 2, 2, -2, 2, 2, 2, 2, 1, 1, 4]
assert_false(nx.is_digraphical(din, dout))
def test_multi_sequence():
# Test nongraphical multi sequence
seq=[1000,3,3,3,3,2,2,2,1,1]
assert_false(nx.is_multigraphical(seq))
# Test small graphical multi sequence
seq=[6,5,4,4,2,1,1,1]
assert_true(nx.is_multigraphical(seq))
# Test for negative integer in sequence
seq=[6,5,4,-4,2,1,1,1]
assert_false(nx.is_multigraphical(seq))
# Test for sequence with odd sum
seq=[1, 1, 1, 1, 1, 1, 2, 2, 2, 3, 4]
assert_false(nx.is_multigraphical(seq))
def test_pseudo_sequence():
# Test small valid pseudo sequence
seq=[1000,3,3,3,3,2,2,2,1,1]
assert_true(nx.is_pseudographical(seq))
# Test for sequence with odd sum
seq=[1000,3,3,3,3,2,2,2,1,1,1]
assert_false(nx.is_pseudographical(seq))
# Test for negative integer in sequence
seq=[1000,3,3,3,3,2,2,-2,1,1]
assert_false(nx.is_pseudographical(seq))
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