def test_merge_list_1_short():
letters = LinkedList()
numbers = LinkedList()
letters.insert('A')
numbers.insert(2)
numbers.insert(3)
actual = letters.merge(numbers)
assert 'A' == actual.value
assert 2 == actual._next.value
def test_merge():
letters = LinkedList()
numbers = LinkedList()
letters.insert('A')
letters.insert('B')
letters.insert('C')
numbers.insert(1)
numbers.insert(2)
numbers.insert(3)
actual = letters.merge(numbers)
expected = 'A'
assert expected == actual.value
