def test_cyclic():
g = Graph()
g.add_edge(Edge(1, 3))
g.add_edge(Edge(2, 1))
assert not g.cyclic()
g.add_edge(Edge(3, 2))
assert g.cyclic()
def test_traverse():
g = Graph()
g.add_edge(Edge(1, 2))
g.add_edge(Edge(1, 3))
g.add_edge(Edge(2, 4))
g.add_edge(Edge(2, 5))
g.add_edge(Edge(5, 3))
g.add_vertex(6)
""" Test bfs """
trace = []
g.bfs(1, func_in=lambda vertex: trace.append(vertex))
assert trace == [1, 2, 3, 4, 5]
""" Test dfs """
trace = []
g.dfs(1, func_in=lambda vertex: trace.append(vertex))
assert trace == [1, 2, 4, 5, 3]
""" Test traverse """
trace = []
g.traverse(order=g.ORDER_BFS, func_in=lambda vertex: trace.append(vertex))
assert trace == [1, 2, 3, 4, 5, 6]
""" Test cyclic """
g.add_edge(Edge(3, 2))
assert g.cyclic()
""" Test acyclic """
g.remove_edge(Edge(3, 2))
assert not g.cyclic()
""" Test topological sort """
assert g.topological() == [6, 1, 2, 5, 3, 4]
""" Test sptree """
assert not g.sptree().cyclic()