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				import pytest


				def test_graph(graph):
				assert len(graph) == 21

				obj = 'swh:1:dir:0000000000000000000000000000000000000008'
				node = graph[obj]

				assert str(node) == obj
				assert len(node.children()) == 3
				assert len(node.parents()) == 2

				actual = {p.pid for p in node.children()}
				expected = {
				'swh:1:cnt:0000000000000000000000000000000000000001',
				'swh:1:dir:0000000000000000000000000000000000000006',
				'swh:1:cnt:0000000000000000000000000000000000000007'
				}
				assert expected == actual

				actual = {p.pid for p in node.parents()}
				expected = {
				'swh:1:rev:0000000000000000000000000000000000000009',
				'swh:1:dir:0000000000000000000000000000000000000012',
				}
				assert expected == actual


				def test_invalid_pid(graph):
				with pytest.raises(IndexError):
				graph[1337]

				with pytest.raises(IndexError):
				graph[len(graph) + 1]

				with pytest.raises(KeyError):
				graph['swh:1:dir:0000000000000000000000000000000420000012']