def test_extend_iterable_object(self):
items = 100
first = LinkedList()
second = list(range(items))
assert first.is_empty()
assert first.extend(second) is None
assert isinstance(first.head, Node)
assert isinstance(first.tail, Node)
assert first.head is not first.tail
assert first.size == len(second)
match = 0
for node in first:
assert node.data == match
match += 1
def test_extend_another_linked_list_from_empty(self):
first = LinkedList()
second = LinkedList()
items = 100
for i in range(items):
assert second.append(i) is None
assert first.is_empty()
assert second.size == items
assert first.extend(second) is None
assert isinstance(first.head, Node)
assert isinstance(first.tail, Node)
assert first.head is not second.head
assert first.tail is not second.tail
assert first.size == second.size
match = 0
for node in first:
assert node.data == match
match += 1
def test_extend_non_iterable_object_error(self):
dll = LinkedList()
with pytest.raises(TypeError):
dll.extend(None)