def test_nodes_are_only_added_once(clear_default_graph):
graph = Graph()
node = NodeForTesting()
for i in range(10):
graph.add_node(node)
assert len(graph.nodes) == 1
def test_node_names_on_graph_have_to_be_unique(clear_default_graph):
graph = Graph()
same_name = "Same Name"
node_1 = NodeForTesting(name=same_name, graph=None)
graph.add_node(node_1)
node_2 = NodeForTesting(name=same_name, graph=None)
with pytest.raises(ValueError):
graph.add_node(node_2)
def test_nodes_can_be_accessed_via_name_through_indexing(clear_default_graph):
graph = Graph()
test_name = "TestName"
node = NodeForTesting(name=test_name)
graph.add_node(node)
assert graph[test_name] == node
with pytest.raises(KeyError):
graph["Does not exist"]
def test_nodes_can_be_added_to_graph(clear_default_graph):
"""Nodes add themselves to their graph as their parent."""
graph = Graph()
graph.add_node(NodeForTesting())
assert 1 == len(graph.nodes)
