def test_add_edge_correct_duplicate(self):
graph = Graph([(1, 2, 1)]) # One edge, two nodes
graph.add_edge(1, 2, 1) # Add a parallel edge
self.assertEqual([(1, 2, 1), (1, 2, 1)], graph.all_edges)
def test_add_edge_correct_easy(self):
graph = Graph([(1, 2, 1)]) # One edge, two nodes
graph.add_edge(2, 3, 2) # Add an edge from 2 to 3 w/ cost 2
self.assertEqual([(1, 2, 1), (2, 3, 2)], graph.all_edges)