def test_insert_first(self):
n = Node(1)
ll = Linkedlist()
ll.insert_first(n)
self.assertEqual(ll.head, n)
self.assertEqual(ll.head.data, n.data)
def test_clear(self):
n = Node(1)
ll = Linkedlist()
ll.insert_first(n)
ll.clear()
self.assertEqual(ll.get_first(), None)
def test_remove_first(self):
n = Node(1)
ll = Linkedlist()
ll.insert_first(n)
self.assertEqual(ll.remove_first(), n)
self.assertEqual(ll.get_first(), None)
