def test_insert_two_elements():
linked_list = LinkedList()
linked_list.insert("beton")
linked_list.insert(431)
assert linked_list.head.get_value() == 431
next_head = linked_list.head.get_next()
assert next_head.get_value() == "beton"
assert next_head.get_next() is None
def test_delete_one_from_nonempty_list():
linked_list = LinkedList()
linked_list.insert(431)
linked_list.insert("bacci")
linked_list.insert(7.05)
assert linked_list.head.get_value() == 7.05
linked_list.delete_last()
assert linked_list.head.get_value() == "bacci"
def test_delete_all_from_nonempty_list():
linked_list = LinkedList()
linked_list.insert(431)
linked_list.insert("bacci")
linked_list.insert(7.05)
assert linked_list.head.get_value() == 7.05
linked_list.delete_last()
assert linked_list.head.get_value() == "bacci"
linked_list.delete_last()
assert linked_list.head.get_value() == 431
linked_list.delete_last()
with pytest.raises(AttributeError):
linked_list.head.get_value()
def test_insert():
linked_list = LinkedList()
linked_list.insert(48)
assert linked_list.head.get_value() == 48
assert linked_list.head.get_next() is None
def test_size_three_elements():
linked_list = LinkedList()
# Insert three elements
for _ in range(3):
linked_list.insert(431)
assert linked_list.size() == 3
def test_size_one_element():
linked_list = LinkedList()
linked_list.insert(431)
assert linked_list.size() == 1