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"""Unit tests for PyGraphviz intefaace.
"""
import os
import tempfile
from nose import SkipTest
from nose.tools import assert_true,assert_equal
import networkx as nx
class TestAGraph(object):
@classmethod
def setupClass(cls):
global pygraphviz
try:
import pygraphviz
except ImportError:
raise SkipTest('PyGraphviz not available.')
def build_graph(self, G):
G.add_edge('A','B')
G.add_edge('A','C')
G.add_edge('A','C')
G.add_edge('B','C')
G.add_edge('A','D')
G.add_node('E')
return G
def assert_equal(self, G1, G2):
assert_true( sorted(G1.nodes())==sorted(G2.nodes()) )
assert_true( sorted(G1.edges())==sorted(G2.edges()) )
def agraph_checks(self, G):
G = self.build_graph(G)
A=nx.to_agraph(G)
H=nx.from_agraph(A)
self.assert_equal(G, H)
fname=tempfile.mktemp()
nx.drawing.nx_agraph.write_dot(H,fname)
Hin=nx.drawing.nx_agraph.read_dot(fname)
os.unlink(fname)
self.assert_equal(H,Hin)
(fd,fname)=tempfile.mkstemp()
fh=open(fname,'w')
nx.drawing.nx_agraph.write_dot(H,fh)
fh.close()
fh=open(fname,'r')
Hin=nx.drawing.nx_agraph.read_dot(fh)
fh.close()
os.unlink(fname)
self.assert_equal(H,Hin)
def test_from_agraph_name(self):
G=nx.Graph(name='test')
A=nx.to_agraph(G)
H=nx.from_agraph(A)
assert_equal(G.name,'test')
def testUndirected(self):
self.agraph_checks(nx.Graph())
def testDirected(self):
self.agraph_checks(nx.DiGraph())
def testMultiUndirected(self):
self.agraph_checks(nx.MultiGraph())
def testMultiDirected(self):
self.agraph_checks(nx.MultiDiGraph())
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