File: //lib/python3/dist-packages/networkx/algorithms/tests/test_asteroidal.py
import networkx as nx
def test_is_at_free():
is_at_free = nx.asteroidal.is_at_free
cycle = nx.cycle_graph(6)
assert not is_at_free(cycle)
path = nx.path_graph(6)
assert is_at_free(path)
small_graph = nx.complete_graph(2)
assert is_at_free(small_graph)
petersen = nx.petersen_graph()
assert not is_at_free(petersen)
clique = nx.complete_graph(6)
assert is_at_free(clique)
line_clique = nx.line_graph(clique)
assert not is_at_free(line_clique)