def test_topo_sorting_bad():
g = Graph()
nodes = []
for i in xrange(3):
g.add_node(i)
nodes.append(g.get_node(i))
edges = [(0, 1), (1, 2), (2, 1)]
for n1, n2 in edges:
nodes[n1].add_edge_to(nodes[n2])
topo_sorting = g.produce_topo_sorting()
assert topo_sorting is None
def test_topo_sorting_good():
g = Graph()
nodes = []
for i in xrange(5):
g.add_node(i)
nodes.append(g.get_node(i))
edges = [(0, 1), (1, 2), (1, 3), (2, 4), (3, 4)]
for n1, n2 in edges:
nodes[n1].add_edge_to(nodes[n2])
topo_sorting = g.produce_topo_sorting()
valid = [[0, 1, 2, 3, 4],
[0, 1, 3, 2, 4]]
assert topo_sorting in valid
def test_topo_sorting_bad():
g = Graph()
nodes = []
for i in xrange(3):
g.add_node(i)
nodes.append(g.get_node(i))
edges = [(0, 1), (1, 2), (2, 1)]
for n1, n2 in edges:
nodes[n1].add_edge_to(nodes[n2])
topo_sorting = g.produce_topo_sorting()
assert topo_sorting is None
def test_topo_sorting_good():
g = Graph()
nodes = []
for i in xrange(5):
g.add_node(i)
nodes.append(g.get_node(i))
edges = [(0, 1), (1, 2), (1, 3), (2, 4), (3, 4)]
for n1, n2 in edges:
nodes[n1].add_edge_to(nodes[n2])
topo_sorting = g.produce_topo_sorting()
valid = [[0, 1, 2, 3, 4], [0, 1, 3, 2, 4]]
assert topo_sorting in valid