def test_group_degree_centrality_single_node(self):
"""
Group degree centrality for a single node group
"""
G = nx.path_graph(4)
d = nx.group_degree_centrality(G, [1])
d_answer = nx.degree_centrality(G)[1]
assert d == d_answer
def test_group_degree_centrality_multiple_node(self):
"""
Group degree centrality for group with more than
1 node
"""
G = nx.Graph()
G.add_nodes_from([1, 2, 3, 4, 5, 6, 7, 8])
G.add_edges_from([(1, 2), (1, 3), (1, 6), (1, 7), (1, 8), (2, 3),
(2, 4), (2, 5)])
d = nx.group_degree_centrality(G, [1, 2])
d_answer = 1
assert d == d_answer
def test_group_degree_centrality_node_not_in_graph(self):
"""
Node(s) in S not in graph, raises NetworkXError
"""
with pytest.raises(nx.NetworkXError):
b = nx.group_degree_centrality(nx.path_graph(5), [6, 7, 8])
