def test_not_connected():
g = Graph()
pandora = g.add_node("Pandora")
arendelle = g.add_node("Arendelle")
assert g.connected(pandora, arendelle) is False
assert g.connected(arendelle, pandora) is False
def test_one_way_connected():
g = Graph()
pandora = g.add_node("Pandora")
arendelle = g.add_node("Arendelle")
g.add_edge(pandora, arendelle)
assert g.connected(pandora, arendelle) is True
assert g.connected(arendelle, pandora) is False
