def test_pop_removes_item_in_the_middle_of_the_list(self):
l1 = LinkedList([1, 2, 3, 4, 5])
elem = l1.pop(2)
self.assertEqual(elem, 3)
self.assertEqual(l1.count(), 4)
self.assertEqual(l1, LinkedList([1, 2, 4, 5]))
elem = l1.pop(1)
self.assertEqual(elem, 2)
self.assertEqual(l1.count(), 3)
self.assertEqual(l1, LinkedList([1, 4, 5]))
def test_pop_with_a_single_element_list(self):
# Default index
l1 = LinkedList([9])
elem = l1.pop()
self.assertEqual(elem, 9)
self.assertEqual(l1.count(), 0)
self.assertEqual(l1, LinkedList([]))
# index == 0
l1 = LinkedList([9])
elem = l1.pop(0)
self.assertEqual(elem, 9)
self.assertEqual(l1.count(), 0)
self.assertEqual(l1, LinkedList([]))
def test_pop_removes_last_item(self):
l1 = LinkedList([1, 2, 3])
elem = l1.pop(2)
self.assertEqual(elem, 3)
self.assertEqual(l1.count(), 2)
self.assertEqual(l1, LinkedList([1, 2]))