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mightyscape-1.1-deprecated/extensions/networkx/readwrite/tests/test_graph6.py

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2020-07-30 01:16:18 +02:00
from io import BytesIO
import tempfile
from unittest import TestCase
import networkx as nx
import networkx.readwrite.graph6 as g6
from networkx.testing.utils import assert_edges_equal
from networkx.testing.utils import assert_nodes_equal
class TestGraph6Utils(object):
def test_n_data_n_conversion(self):
for i in [0, 1, 42, 62, 63, 64, 258047, 258048, 7744773, 68719476735]:
assert g6.data_to_n(g6.n_to_data(i))[0] == i
assert g6.data_to_n(g6.n_to_data(i))[1] == []
assert (g6.data_to_n(g6.n_to_data(i) + [42, 43])[1] ==
[42, 43])
class TestFromGraph6Bytes(TestCase):
def test_from_graph6_bytes(self):
data = b'DF{'
G = nx.from_graph6_bytes(data)
assert_nodes_equal(G.nodes(), [0, 1, 2, 3, 4])
assert_edges_equal(G.edges(),
[(0, 3), (0, 4), (1, 3), (1, 4), (2, 3), (2, 4), (3, 4)])
def test_read_equals_from_bytes(self):
data = b'DF{'
G = nx.from_graph6_bytes(data)
fh = BytesIO(data)
Gin = nx.read_graph6(fh)
assert_nodes_equal(G.nodes(), Gin.nodes())
assert_edges_equal(G.edges(), Gin.edges())
class TestReadGraph6(TestCase):
def test_read_many_graph6(self):
"""Test for reading many graphs from a file into a list."""
data = b'DF{\nD`{\nDqK\nD~{\n'
fh = BytesIO(data)
glist = nx.read_graph6(fh)
assert len(glist) == 4
for G in glist:
assert sorted(G) == list(range(5))
class TestWriteGraph6(TestCase):
"""Unit tests for writing a graph to a file in graph6 format."""
def test_null_graph(self):
result = BytesIO()
nx.write_graph6(nx.null_graph(), result)
self.assertEqual(result.getvalue(), b'>>graph6<<?\n')
def test_trivial_graph(self):
result = BytesIO()
nx.write_graph6(nx.trivial_graph(), result)
self.assertEqual(result.getvalue(), b'>>graph6<<@\n')
def test_complete_graph(self):
result = BytesIO()
nx.write_graph6(nx.complete_graph(4), result)
self.assertEqual(result.getvalue(), b'>>graph6<<C~\n')
def test_large_complete_graph(self):
result = BytesIO()
nx.write_graph6(nx.complete_graph(67), result, header=False)
self.assertEqual(result.getvalue(), b'~?@B' + b'~' * 368 + b'w\n')
def test_no_header(self):
result = BytesIO()
nx.write_graph6(nx.complete_graph(4), result, header=False)
self.assertEqual(result.getvalue(), b'C~\n')
def test_complete_bipartite_graph(self):
result = BytesIO()
G = nx.complete_bipartite_graph(6, 9)
nx.write_graph6(G, result, header=False)
# The expected encoding here was verified by Sage.
self.assertEqual(result.getvalue(), b'N??F~z{~Fw^_~?~?^_?\n')
def no_directed_graphs(self):
with self.assertRaises(nx.NetworkXNotImplemented):
nx.write_graph6(nx.DiGraph(), BytesIO())
def test_length(self):
for i in list(range(13)) + [31, 47, 62, 63, 64, 72]:
g = nx.random_graphs.gnm_random_graph(i, i * i // 4, seed=i)
gstr = BytesIO()
nx.write_graph6(g, gstr, header=False)
# Strip the trailing newline.
gstr = gstr.getvalue().rstrip()
assert (len(gstr) ==
((i - 1) * i // 2 + 5) // 6 + (1 if i < 63 else 4))
def test_roundtrip(self):
for i in list(range(13)) + [31, 47, 62, 63, 64, 72]:
G = nx.random_graphs.gnm_random_graph(i, i * i // 4, seed=i)
f = BytesIO()
nx.write_graph6(G, f)
f.seek(0)
H = nx.read_graph6(f)
assert_nodes_equal(G.nodes(), H.nodes())
assert_edges_equal(G.edges(), H.edges())
def test_write_path(self):
with tempfile.NamedTemporaryFile() as f:
g6.write_graph6_file(nx.null_graph(), f)
f.seek(0)
self.assertEqual(f.read(), b'>>graph6<<?\n')
def test_relabeling(self):
G = nx.Graph([(0, 1)])
assert g6.to_graph6_bytes(G) == b'>>graph6<<A_\n'
G = nx.Graph([(1, 2)])
assert g6.to_graph6_bytes(G) == b'>>graph6<<A_\n'
G = nx.Graph([(1, 42)])
assert g6.to_graph6_bytes(G) == b'>>graph6<<A_\n'