def test_delete_1():
ll = LinkedList(1)
ll.append(2)
ll.delete(0)
assert 2 == ll[0]
with pytest.raises(IndexError):
ll[1]
def test_delete_error_2():
ll = LinkedList(1)
ll.append(2)
with pytest.raises(IndexError):
ll.delete(3)
def test_delete_error_1():
ll = LinkedList()
with pytest.raises(IndexError):
ll.delete(0)
def test_delete_head():
ll = LinkedList(1)
ll.delete(0)
assert None is ll.head