def test_push_pop(self):
test_list = DoubleLinkedList()
test_list.push(5)
self.assertEqual(test_list.len(), 1)
self.assertEqual(test_list.pop(), 5)
def test_pop_empty(self):
test_list = DoubleLinkedList()
self.assertEqual(test_list.pop(), "list is empty")
def test_pop(self):
test_list = DoubleLinkedList()
for i in range(5):
test_list.push(i)
for i in range(5):
self.assertEqual(test_list.pop(), 4 - i)
def test_pop(self):
list_1 = DoubleLinkedList()
list_1.push(1)
list_1.pop()
self.assertEqual(list_1.len(), 0)