def test_get_connected_components(self):
"""Get connected components of a graph."""
graph = Graph(is_directed=False)
vertex_a = graph.add_vertex('A')
vertex_b = graph.add_vertex('B')
vertex_c = graph.add_vertex('C')
vertex_d = graph.add_vertex('D')
vertex_d = graph.add_vertex('E')
vertex_d = graph.add_vertex('F')
graph.add_edge('A', 'B')
graph.add_edge('A', 'C')
graph.add_edge('B', 'C')
graph.add_edge('D', 'E')
expected_components = [['A', 'B', 'C'], ['D', 'E'], ['F']]
# sort each component for ease of comparison
actual_components = graph.find_connected_components()
actual_components = [sorted(comp) for comp in actual_components]
self.assertCountEqual(expected_components, actual_components)
