def test_zip_nums1():
num1 = LinkedList()
num1.append('5')
num1.append('2')
num2 = LinkedList()
num2.append('7')
lst = zipLists(num1,num2)
assert lst.__str__() == '5->7->2-> NULL'
def test_sorted():
num1 = LinkedList()
num1.append('5')
num1.append('6')
num2 = LinkedList()
num2.append('3')
num2.append('4')
lst = to_sorted(num1,num2)
assert lst.__str__() == '3->4->5->6-> NULL'
def test_zip():
fruits = LinkedList()
fruits.append('apple')
fruits.append('berries')
fruits.append('banana')
veggies = LinkedList()
veggies.append('Carrots')
veggies.append('Broccoli')
veggies.append('Mushrooms')
lst = zipLists(fruits,veggies)
assert lst.__str__() == 'apple->Carrots->berries->Broccoli->banana->Mushrooms-> NULL'
def test_zip_null():
num1 = LinkedList()
num2 = LinkedList()
lst = zipLists(num1,num2)
assert lst.__str__() == ' NULL'