def test_get_first(self):
l = DoublyLinkedList()
self.assertRaises(IndexError, l.get_first)
for i in range(50):
l.add_first(i)
self.assertEqual(l.get_first(), i)
def test_add_first(self):
la = DoublyLinkedList()
lb = DoublyLinkedList()
for i in range(1000):
n = random.randint(1, 360)
la.add(n)
lb.add_first(n)
self.assertEqual(la, lb.reverse())
def test_index_of(self):
l = DoublyLinkedList()
self.assertRaises(ValueError, l.index_of, 'a')
for i in range(5):
l.add(1)
self.assertEqual(l.index_of(1), 0)
l.remove_last()
l.add(2)
self.assertEqual(l.index_of(2), 4)
l.remove_first()
l.add_first(2)
self.assertEqual(l.index_of(1), 1)