def test_graph_nodes_list():
graph = Graph()
a = graph.add_node("a")
b = graph.add_node("b")
actual = graph.get_nodes()
expected = [a, b]
assert actual == expected
def test_get_nodes():
g = Graph()
g.add_node('a')
g.add_node('b')
expected = ['a', 'b']
actual = []
[actual.append(item.value) for item in g.get_nodes()]
assert actual == expected
def test_get_nodes():
graph = Graph()
graph.add_node("banana")
graph.add_node("apple")
expected = 2
actual = len(graph.get_nodes())
assert actual == expected
def test_graph_nodes_empty():
graph = Graph()
actual = graph.get_nodes()
expected = None
assert actual == expected
def test_get_all_nodes():
graph = Graph()
node = graph.add_node('node')
node_two = graph.add_node('node_two')
assert len(graph.get_nodes()) == 2
