373
373
self.assertEqual(set(['rev1']), graph.heads(('rev1', 'null:')))
375
375
def test_heads_one(self):
377
377
graph = self.make_graph(ancestry_1)
378
378
self.assertEqual(set(['null:']), graph.heads(['null:']))
379
379
self.assertEqual(set(['rev1']), graph.heads(['rev1']))