def test_of_three_components(self):
"""
1-2 3 4
"""
nodes = self.nodes
nodes[0].neighbors.append(nodes[1])
nodes[1].neighbors.append(nodes[0])
self.assertEqual(cc.connected_components(nodes), [[1, 2], [3], [4]])
def test_of_four_components(self):
"""
1 2 3 4
"""
nodes = self.nodes
self.assertEqual(
cc.connected_components(nodes),
[[1], [2], [3], [4]])