def test_can_infer_nodes_through_relationships(self):
s = Subgraph([], [alice_knows_bob])
self.assertSetEqual(s.nodes, {alice, bob})
self.assertSetEqual(s.relationships, {alice_knows_bob})
def test_empty_subgraph(self):
with self.assertRaises(ValueError):
Subgraph()
def test_empty_subgraph(self):
s = Subgraph()
assert len(s.nodes) == 0
assert len(s.relationships) == 0