def test_insert():
ll = LinkedList()
ll.append(2)
ll.insert(0, 1)
ll.insert(1, 2)
assert (ll[0] == 1)
assert (ll[1] == 2)
assert (len(ll) == 3)
def test_peek():
ll = LinkedList()
ll.append(2)
ll.insert(0, 1)
ll.insert(1, 2)
assert (ll.front() == 1)
assert (ll.back() == 2)
assert (len(ll) == 3)
def test_prepend():
ll = LinkedList()
ll.append(2)
ll.prepend(0)
print(ll)
assert (ll[0] == 0)
assert (ll[1] == 2)
assert (ll.length == 2)
def test_pop():
ll = LinkedList()
ll.append(2)
ll.insert(0, 1)
ll.insert(1, 2)
assert (ll.pop() == 2)
assert (ll.pop_idx(0) == 1)
assert (ll[0] == 2)
assert (len(ll) == 1)
def test_str():
ll = LinkedList()
ll.append(2)
assert (str(ll) == '[2]')
def test_get():
ll = LinkedList()
ll.append(1)
assert (ll[0] == 1)
def test_append():
ll = LinkedList()
ll.append(0)
assert (ll.head.item == 0)
assert (len(ll) == 1)