def test_insert_after_does_not_exist():
ll = LinkedList()
ll.insert(1)
ll.insert(2)
with pytest.raises(Exception) as context:
ll.insert_after(3, 3)
assert str(context.value) == "No node containing: 3"
def test_insert_after_exists():
ll = LinkedList()
ll.insert(2)
ll.insert(1)
ll.insert_after(3, 2)
assert str(ll) == '{ 1 } -> { 2 } -> { 3 } -> NULL'
def test_insert_after_empty():
ll = LinkedList()
with pytest.raises(Exception) as context:
ll.insert_after(1, 1)
assert str(context.value) == "Cannot `insert_after` on empty LinkedList"