def test_copy():
list = SingleLinkedList()
list.append(1).append(2).append(3)
copy = list.copy()
assert not copy == list
assert copy.size() == 3
assert copy.size() == list.size()
assert copy.head() == 1
def test_remove_last():
list = SingleLinkedList()
list.removeLast()
assert list.isEmpty()
list.append(1).removeLast()
assert list.isEmpty()
list.prepend(3).prepend(2).prepend(1)
assert list.size() == 3
list.removeLast()
assert list.head() == 1
assert list.size() == 2
list.removeLast().removeLast().removeLast()
assert list.size() == 0
def test_append():
list = SingleLinkedList()
list.append(1)
assert list.head() == 1
list.append(2).append(3)
assert list.head() == 1
