def test_group_closeness_single_node(self):
"""
Group closeness centrality for a single node group
"""
G = nx.path_graph(5)
c = nx.group_closeness_centrality(G, [1])
c_answer = nx.closeness_centrality(G, 1)
assert c == c_answer
def test_group_closeness_multiple_node(self):
"""
Group closeness centrality for a group with more than
1 node
"""
G = nx.path_graph(4)
c = nx.group_closeness_centrality(G, [1, 2])
c_answer = 1
assert c == c_answer
def test_group_closeness_disconnected(self):
"""
Group closeness centrality for a disconnected graph
"""
G = nx.Graph()
G.add_nodes_from([1, 2, 3, 4])
c = nx.group_closeness_centrality(G, [1, 2])
c_answer = 0
assert c == c_answer
def test_group_closeness_node_not_in_graph(self):
"""
Node(s) in S not in graph, raises NodeNotFound exception
"""
with pytest.raises(nx.NodeNotFound):
c = nx.group_closeness_centrality(nx.path_graph(5), [6, 7, 8])
