def test_del_vertex(self):
d = DirectedGraph({1: [2, 3], 2: [4], 3: [4]})
self.assertEqual(d.get_outdegree(1), 2)
self.assertEqual(d.get_indegree(4), 2)
self.assertEqual(len(d), 4)
self.assertTrue(2 in d)
d.del_vertex(2)
self.assertEqual(d.get_outdegree(1), 1)
self.assertEqual(d.get_indegree(4), 1)
self.assertEqual(len(d), 3)
self.assertFalse(2 in d)
def test_del_vertex():
graph = DirectedGraph({1: [2, 3], 2: [4], 3: [4]})
assert graph.get_outdegree(1) == 2
assert graph.get_indegree(4) == 2
assert len(graph) == 4
assert 2 in graph
graph.del_vertex(2)
assert graph.get_outdegree(1) == 1
assert graph.get_indegree(4) == 1
assert len(graph) == 3
assert 2 not in graph
