def test_remove_first(self):
sll = Singlellist([1, 2, 3])
sll.remove_first()
self.assertEqual(sll[0], 2)
sll.remove_first()
self.assertEqual(sll[0], 3)
sll.remove_first()
self.assertEqual(sll.is_empty(), True)
def test_remove_all(self):
sll = Singlellist([1, 1, 2, 3, 3])
sll.remove_all(1)
self.assertEqual(str(sll), "SLL[2, 3, 3]")
sll.remove_all(3)
self.assertEqual(str(sll), "SLL[2]")
sll.remove_all(2)
self.assertEqual(sll.is_empty(), True)
def test_empty(self):
sll = Singlellist()
self.assertEqual(sll.is_empty(), True)
sll.add_first(1)
self.assertEqual(sll.is_empty(), False)
