def test_get_nodes():
graph = Graph()
node1 = graph.add_node(1)
node2 = graph.add_node(2)
actual = len(graph.get_nodes())
expected = 2
assert actual == expected
def test_node_graph_2():
g = Graph()
node1 = g.add_node('Test')
node2 = g.add_node('random')
actual = len(g.get_nodes())
expected = 2
assert actual == expected