def test_paths(self):
g = nx.Graph()
g.add_edge(Node(0, 0), Node(1, 0))
g.add_edge(Node(3, 0), Node(2, 0))
g.add_edge(Node(2, 0), Node(1, 0))
g.add_edge(Node(2, 0), Node(2, 2))
g.add_edge(Node(3, 0), Node(3, 2))
opengraph = OpenGraph(g)
assert len(opengraph.paths()) == 2
def test_init(self):
opengraph = OpenGraph()
assert opengraph != None
assert opengraph.style().target_type() == 'fill'
assert opengraph.paths() == []
