def test_LinkedList_includes_false():
ll = LinkedList()
ll.insert("a")
ll.insert("b")
ll.insert("c")
actual = ll.includes("d")
expected = False
assert actual == expected
def test_LinkedList_includes_true():
ll = LinkedList()
ll.insert("a")
ll.insert("b")
ll.insert("c")
actual = ll.includes("c")
expected = True
assert actual == expected