def test_linked_list_remove():
ll = LinkedList()
ll.append(3)
ll.append(4)
ll.append(5)
ll.append(6)
ll.append(7)
ll.remove(7)
print(list(ll))
def test_linked_list_insert():
ll = LinkedList()
ll.append(3)
ll.append(4)
ll.append(5)
result = ll.insert(4, 10)
assert result == 1
assert len(ll) == 4
assert list(ll) == [3, 10, 4, 5]
result = ll.insert(100, 1000)
assert result == -1
def test_linked_list():
ll = LinkedList()
ll.append(0)
ll.append(1)
ll.append(2)
ll.append(3)
assert len(ll) == 4
assert ll.find(2) == 2
assert ll.find(-1) == -1
assert ll.remove(0) == 1
assert ll.remove(10) == -1
assert ll.remove(2) == 1
assert len(ll) == 2
assert list(ll) == [1, 3]
assert ll.find(0) == -1
ll.appendleft(0)
assert list(ll) == [0, 1, 3]
assert len(ll) == 3
headvalue = ll.popleft()
assert headvalue == 0
assert len(ll) == 2
assert list(ll) == [1, 3]
ll.clear()
assert len(ll) == 0
def test_init_empty(self):
ll = LinkedList()
self.assertEqual([], list(ll))
def test_str(self):
ll = LinkedList()
self.assertEqual("[]", str(ll))
ll = LinkedList([1, 2, "3", 4, False])
self.assertEqual("[1, 2, 3, 4, False]", str(ll))
def test_prepend(self):
ll = LinkedList()
ll.prepend(1)
ll.prepend(2)
ll.prepend(3)
self.assertEqual([3, 2, 1], list(ll))
def test_append(self):
ll = LinkedList()
ll.append(1)
ll.append(2)
ll.append(3)
self.assertEqual([1, 2, 3], list(ll))
def test_init_from_array(self):
lst = [1, 2, 3, 4, 5]
ll = LinkedList(lst)
self.assertEqual(lst, list(ll))