246 lines
8.2 KiB
Python
246 lines
8.2 KiB
Python
"""
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Unit tests for edgelists.
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"""
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import pytest
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import io
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import tempfile
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import os
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import networkx as nx
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from networkx.testing import (assert_edges_equal, assert_nodes_equal,
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assert_graphs_equal)
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class TestEdgelist:
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@classmethod
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def setup_class(cls):
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cls.G = nx.Graph(name="test")
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e = [('a', 'b'), ('b', 'c'), ('c', 'd'), ('d', 'e'), ('e', 'f'), ('a', 'f')]
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cls.G.add_edges_from(e)
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cls.G.add_node('g')
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cls.DG = nx.DiGraph(cls.G)
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cls.XG = nx.MultiGraph()
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cls.XG.add_weighted_edges_from([(1, 2, 5), (1, 2, 5), (1, 2, 1), (3, 3, 42)])
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cls.XDG = nx.MultiDiGraph(cls.XG)
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def test_read_edgelist_1(self):
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s = b"""\
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# comment line
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1 2
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# comment line
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2 3
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"""
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bytesIO = io.BytesIO(s)
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G = nx.read_edgelist(bytesIO, nodetype=int)
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assert_edges_equal(G.edges(), [(1, 2), (2, 3)])
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def test_read_edgelist_2(self):
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s = b"""\
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# comment line
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1 2 2.0
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# comment line
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2 3 3.0
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"""
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bytesIO = io.BytesIO(s)
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G = nx.read_edgelist(bytesIO, nodetype=int, data=False)
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assert_edges_equal(G.edges(), [(1, 2), (2, 3)])
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bytesIO = io.BytesIO(s)
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G = nx.read_weighted_edgelist(bytesIO, nodetype=int)
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assert_edges_equal(G.edges(data=True),
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[(1, 2, {'weight': 2.0}), (2, 3, {'weight': 3.0})])
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def test_read_edgelist_3(self):
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s = b"""\
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# comment line
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1 2 {'weight':2.0}
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# comment line
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2 3 {'weight':3.0}
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"""
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bytesIO = io.BytesIO(s)
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G = nx.read_edgelist(bytesIO, nodetype=int, data=False)
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assert_edges_equal(G.edges(), [(1, 2), (2, 3)])
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bytesIO = io.BytesIO(s)
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G = nx.read_edgelist(bytesIO, nodetype=int, data=True)
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assert_edges_equal(G.edges(data=True),
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[(1, 2, {'weight': 2.0}), (2, 3, {'weight': 3.0})])
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def test_read_edgelist_4(self):
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s = b"""\
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# comment line
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1 2 {'weight':2.0}
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# comment line
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2 3 {'weight':3.0}
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"""
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bytesIO = io.BytesIO(s)
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G = nx.read_edgelist(bytesIO, nodetype=int, data=False)
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assert_edges_equal(G.edges(), [(1, 2), (2, 3)])
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bytesIO = io.BytesIO(s)
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G = nx.read_edgelist(bytesIO, nodetype=int, data=True)
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assert_edges_equal(G.edges(data=True),
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[(1, 2, {'weight': 2.0}), (2, 3, {'weight': 3.0})])
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s = """\
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# comment line
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1 2 {'weight':2.0}
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# comment line
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2 3 {'weight':3.0}
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"""
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StringIO = io.StringIO(s)
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G = nx.read_edgelist(StringIO, nodetype=int, data=False)
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assert_edges_equal(G.edges(), [(1, 2), (2, 3)])
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StringIO = io.StringIO(s)
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G = nx.read_edgelist(StringIO, nodetype=int, data=True)
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assert_edges_equal(G.edges(data=True),
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[(1, 2, {'weight': 2.0}), (2, 3, {'weight': 3.0})])
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def test_write_edgelist_1(self):
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fh = io.BytesIO()
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G = nx.OrderedGraph()
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G.add_edges_from([(1, 2), (2, 3)])
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nx.write_edgelist(G, fh, data=False)
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fh.seek(0)
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assert fh.read() == b"1 2\n2 3\n"
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def test_write_edgelist_2(self):
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fh = io.BytesIO()
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G = nx.OrderedGraph()
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G.add_edges_from([(1, 2), (2, 3)])
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nx.write_edgelist(G, fh, data=True)
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fh.seek(0)
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assert fh.read() == b"1 2 {}\n2 3 {}\n"
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def test_write_edgelist_3(self):
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fh = io.BytesIO()
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G = nx.OrderedGraph()
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G.add_edge(1, 2, weight=2.0)
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G.add_edge(2, 3, weight=3.0)
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nx.write_edgelist(G, fh, data=True)
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fh.seek(0)
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assert fh.read() == b"1 2 {'weight': 2.0}\n2 3 {'weight': 3.0}\n"
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def test_write_edgelist_4(self):
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fh = io.BytesIO()
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G = nx.OrderedGraph()
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G.add_edge(1, 2, weight=2.0)
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G.add_edge(2, 3, weight=3.0)
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nx.write_edgelist(G, fh, data=[('weight')])
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fh.seek(0)
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assert fh.read() == b"1 2 2.0\n2 3 3.0\n"
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def test_unicode(self):
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G = nx.Graph()
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try: # Python 3.x
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name1 = chr(2344) + chr(123) + chr(6543)
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name2 = chr(5543) + chr(1543) + chr(324)
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except ValueError: # Python 2.6+
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name1 = unichr(2344) + unichr(123) + unichr(6543)
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name2 = unichr(5543) + unichr(1543) + unichr(324)
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G.add_edge(name1, 'Radiohead', **{name2: 3})
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fd, fname = tempfile.mkstemp()
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nx.write_edgelist(G, fname)
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H = nx.read_edgelist(fname)
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assert_graphs_equal(G, H)
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os.close(fd)
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os.unlink(fname)
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def test_latin1_issue(self):
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G = nx.Graph()
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try: # Python 3.x
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name1 = chr(2344) + chr(123) + chr(6543)
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name2 = chr(5543) + chr(1543) + chr(324)
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except ValueError: # Python 2.6+
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name1 = unichr(2344) + unichr(123) + unichr(6543)
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name2 = unichr(5543) + unichr(1543) + unichr(324)
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G.add_edge(name1, 'Radiohead', **{name2: 3})
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fd, fname = tempfile.mkstemp()
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pytest.raises(UnicodeEncodeError,
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nx.write_edgelist,
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G, fname, encoding='latin-1')
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os.close(fd)
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os.unlink(fname)
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def test_latin1(self):
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G = nx.Graph()
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try: # Python 3.x
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blurb = chr(1245) # just to trigger the exception
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name1 = 'Bj' + chr(246) + 'rk'
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name2 = chr(220) + 'ber'
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except ValueError: # Python 2.6+
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name1 = 'Bj' + unichr(246) + 'rk'
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name2 = unichr(220) + 'ber'
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G.add_edge(name1, 'Radiohead', **{name2: 3})
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fd, fname = tempfile.mkstemp()
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nx.write_edgelist(G, fname, encoding='latin-1')
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H = nx.read_edgelist(fname, encoding='latin-1')
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assert_graphs_equal(G, H)
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os.close(fd)
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os.unlink(fname)
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def test_edgelist_graph(self):
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G = self.G
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(fd, fname) = tempfile.mkstemp()
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nx.write_edgelist(G, fname)
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H = nx.read_edgelist(fname)
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H2 = nx.read_edgelist(fname)
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assert H != H2 # they should be different graphs
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G.remove_node('g') # isolated nodes are not written in edgelist
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assert_nodes_equal(list(H), list(G))
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assert_edges_equal(list(H.edges()), list(G.edges()))
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os.close(fd)
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os.unlink(fname)
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def test_edgelist_digraph(self):
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G = self.DG
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(fd, fname) = tempfile.mkstemp()
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nx.write_edgelist(G, fname)
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H = nx.read_edgelist(fname, create_using=nx.DiGraph())
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H2 = nx.read_edgelist(fname, create_using=nx.DiGraph())
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assert H != H2 # they should be different graphs
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G.remove_node('g') # isolated nodes are not written in edgelist
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assert_nodes_equal(list(H), list(G))
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assert_edges_equal(list(H.edges()), list(G.edges()))
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os.close(fd)
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os.unlink(fname)
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def test_edgelist_integers(self):
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G = nx.convert_node_labels_to_integers(self.G)
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(fd, fname) = tempfile.mkstemp()
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nx.write_edgelist(G, fname)
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H = nx.read_edgelist(fname, nodetype=int)
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# isolated nodes are not written in edgelist
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G.remove_nodes_from(list(nx.isolates(G)))
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assert_nodes_equal(list(H), list(G))
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assert_edges_equal(list(H.edges()), list(G.edges()))
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os.close(fd)
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os.unlink(fname)
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def test_edgelist_multigraph(self):
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G = self.XG
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(fd, fname) = tempfile.mkstemp()
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nx.write_edgelist(G, fname)
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H = nx.read_edgelist(fname, nodetype=int, create_using=nx.MultiGraph())
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H2 = nx.read_edgelist(fname, nodetype=int, create_using=nx.MultiGraph())
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assert H != H2 # they should be different graphs
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assert_nodes_equal(list(H), list(G))
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assert_edges_equal(list(H.edges()), list(G.edges()))
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os.close(fd)
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os.unlink(fname)
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def test_edgelist_multidigraph(self):
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G = self.XDG
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(fd, fname) = tempfile.mkstemp()
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nx.write_edgelist(G, fname)
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H = nx.read_edgelist(fname, nodetype=int, create_using=nx.MultiDiGraph())
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H2 = nx.read_edgelist(fname, nodetype=int, create_using=nx.MultiDiGraph())
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assert H != H2 # they should be different graphs
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assert_nodes_equal(list(H), list(G))
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assert_edges_equal(list(H.edges()), list(G.edges()))
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os.close(fd)
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os.unlink(fname)
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