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"""Unit tests for the :mod:`networkx.algorithms.isolates` module."""
import networkx as nx
def test_is_isolate():
G = nx.Graph()
G.add_edge(0, 1)
G.add_node(2)
assert not nx.is_isolate(G, 0)
assert not nx.is_isolate(G, 1)
assert nx.is_isolate(G, 2)
def test_isolates():
G = nx.Graph()
G.add_edge(0, 1)
G.add_nodes_from([2, 3])
assert sorted(nx.isolates(G)) == [2, 3]
def test_number_of_isolates():
G = nx.Graph()
G.add_edge(0, 1)
G.add_nodes_from([2, 3])
assert nx.number_of_isolates(G) == 2
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