def test_v2_nexist(self, v1, v2, lst):
l1 = LinkedList()
l2 = LinkedList()
for item in lst:
l1.append(item)
l2.append(item)
l1.insert_before(v1, v2)
self.assertEqual(l1 == l2, True)
def test_v2_exist(self, v1, v2, lst):
l1 = LinkedList()
for item in lst:
l1.append(item)
l1.prepend(v2)
l1.insert_before(v1, v2)
self.assertEqual(l1.size == len(lst) + 2, True)
self.assertEqual(l1.front.value == v1, True)
def test_empty(self):
l1 = LinkedList()
l1.insert_before(1, 1)
self.assertEqual(str(l1),
"I'm so empty... experiencing existential angst!!!")