test(`#${method} throws when inserting item that is already in this list`, (assert) => {
let list = new LinkedList();
let item = new LinkedItem();
list[method](item);
assert.throws(
() => list[method](item),
/Cannot insert.*already in a list/
);
});
test(`#${method} calls adoptItem`, (assert) => {
let adoptedItem;
let list = new LinkedList({
adoptItem(item) {
adoptedItem = item;
}
});
let item = new LinkedItem();
list[method](item);
assert.equal(adoptedItem, item, 'item is adopted');
});
test(`#${method} initial item`, (assert) => {
let list = new LinkedList();
let item = new LinkedItem();
list[method](item);
assert.equal(list.length, 1, 'length is one');
assert.equal(list.isEmpty, false, 'isEmpty is false');
assert.equal(list.head, item, 'head is item');
assert.equal(list.tail, item, 'tail is item');
assert.equal(item.next, null, 'item next is null');
assert.equal(item.prev, null, 'item prev is null');
});
() => list[method](item),