def test_contents(): dag = DAG() dag\ .add_edge(0, 1)\ .add_edge(1, 0)\ .add_edge(2, 1) assert dag.contains_vertex(0) assert dag.contains_vertex(2) assert dag.contains_vertex(1) assert not dag.contains_vertex(5) assert dag.contains_edge(0, 1) assert dag.contains_edge(2, 1) assert dag.contains_edge(1, 0) assert not dag.contains_edge(1, 2) assert not dag.contains_edge(5, 6)
def test_deletion(): dag = DAG() dag\ .add_edge(0, 1)\ .add_edge(1, 0)\ .add_edge(2, 1) dag.remove_edge(0, 1) assert not dag.contains_edge(0, 1) assert dag.adjacent(0) == set() assert dag.contains_edge(1, 0) assert dag.contains_vertex(0) with pytest.raises(KeyError): dag.remove_edge(0, 1) dag.remove_vertex(1) assert not dag.contains_vertex(1) assert not dag.contains_edge(1, 0) assert not dag.contains_edge(2, 1) assert dag.adjacent(2) == set() assert dag.contains_vertex(2) with pytest.raises(KeyError): dag.adjacent(1)