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import pytest
import networkx as nx
def test_valid_degree_sequence1():
n = 100
p = 0.3
for i in range(10):
G = nx.erdos_renyi_graph(n, p)
deg = (d for n, d in G.degree())
assert nx.is_graphical(deg, method="eg")
assert nx.is_graphical(deg, method="hh")
def test_valid_degree_sequence2():
n = 100
for i in range(10):
G = nx.barabasi_albert_graph(n, 1)
deg = (d for n, d in G.degree())
assert nx.is_graphical(deg, method="eg")
assert nx.is_graphical(deg, method="hh")
def test_string_input():
pytest.raises(nx.NetworkXException, nx.is_graphical, [], "foo")
pytest.raises(nx.NetworkXException, nx.is_graphical, ["red"], "hh")
pytest.raises(nx.NetworkXException, nx.is_graphical, ["red"], "eg")
def test_non_integer_input():
pytest.raises(nx.NetworkXException, nx.is_graphical, [72.5], "eg")
pytest.raises(nx.NetworkXException, nx.is_graphical, [72.5], "hh")
def test_negative_input():
assert not nx.is_graphical([-1], "hh")
assert not nx.is_graphical([-1], "eg")
class TestAtlas:
@classmethod
def setup_class(cls):
global atlas
from networkx.generators import atlas
cls.GAG = atlas.graph_atlas_g()
def test_atlas(self):
for graph in self.GAG:
deg = (d for n, d in graph.degree())
assert nx.is_graphical(deg, method="eg")
assert nx.is_graphical(deg, method="hh")
def test_small_graph_true():
z = [5, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1]
assert nx.is_graphical(z, method="hh")
assert nx.is_graphical(z, method="eg")
z = [10, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2]
assert nx.is_graphical(z, method="hh")
assert nx.is_graphical(z, method="eg")
z = [1, 1, 1, 1, 1, 2, 2, 2, 3, 4]
assert nx.is_graphical(z, method="hh")
assert nx.is_graphical(z, method="eg")
def test_small_graph_false():
z = [1000, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1]
assert not nx.is_graphical(z, method="hh")
assert not nx.is_graphical(z, method="eg")
z = [6, 5, 4, 4, 2, 1, 1, 1]
assert not nx.is_graphical(z, method="hh")
assert not nx.is_graphical(z, method="eg")
z = [1, 1, 1, 1, 1, 1, 2, 2, 2, 3, 4]
assert not nx.is_graphical(z, method="hh")
assert not nx.is_graphical(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 = (d for n, d in G.in_degree())
dout = (d for n, d in G.out_degree())
assert 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 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 not 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 nx.is_digraphical(din, dout)
# Test nonmatching sum
din = [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1]
assert not nx.is_digraphical(din, dout)
# Test for negative integer in sequence
din = [2, 2, 2, -2, 2, 2, 2, 2, 1, 1, 4]
assert not nx.is_digraphical(din, dout)
# Test for noninteger
din = dout = [1, 1, 1.1, 1]
assert not nx.is_digraphical(din, dout)
din = dout = [1, 1, "rer", 1]
assert not 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 not nx.is_multigraphical(seq)
# Test small graphical multi sequence
seq = [6, 5, 4, 4, 2, 1, 1, 1]
assert nx.is_multigraphical(seq)
# Test for negative integer in sequence
seq = [6, 5, 4, -4, 2, 1, 1, 1]
assert not nx.is_multigraphical(seq)
# Test for sequence with odd sum
seq = [1, 1, 1, 1, 1, 1, 2, 2, 2, 3, 4]
assert not nx.is_multigraphical(seq)
# Test for noninteger
seq = [1, 1, 1.1, 1]
assert not nx.is_multigraphical(seq)
seq = [1, 1, "rer", 1]
assert not 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 nx.is_pseudographical(seq)
# Test for sequence with odd sum
seq = [1000, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1]
assert not nx.is_pseudographical(seq)
# Test for negative integer in sequence
seq = [1000, 3, 3, 3, 3, 2, 2, -2, 1, 1]
assert not nx.is_pseudographical(seq)
# Test for noninteger
seq = [1, 1, 1.1, 1]
assert not nx.is_pseudographical(seq)
seq = [1, 1, "rer", 1]
assert not nx.is_pseudographical(seq)
def test_numpy_degree_sequence():
np = pytest.importorskip("numpy")
ds = np.array([1, 2, 2, 2, 1], dtype=np.int64)
assert nx.is_graphical(ds, "eg")
assert nx.is_graphical(ds, "hh")
ds = np.array([1, 2, 2, 2, 1], dtype=np.float64)
assert nx.is_graphical(ds, "eg")
assert nx.is_graphical(ds, "hh")
ds = np.array([1.1, 2, 2, 2, 1], dtype=np.float64)
pytest.raises(nx.NetworkXException, nx.is_graphical, ds, "eg")
pytest.raises(nx.NetworkXException, nx.is_graphical, ds, "hh")
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