$collection = new Collection(['data' => [1, 2, 3]]);
$collection->rewind();
expect($collection->next())->toBe(2);
expect($collection->next())->toBe(3);
expect($collection->next())->toBe(null);
$collection->end();
expect($collection->prev())->toBe(2);
expect($collection->prev())->toBe(1);
expect($collection->prev())->toBe(null);
});
});
describe("->rewind/end()", function () {
it("returns respectively the first and the last item of the collection", function () {
$collection = new Collection(['data' => [1, 2, 3, 4, 5]]);
expect($collection->end())->toBe(5);
expect($collection->rewind())->toBe(1);
});
});
describe("->valid()", function () {
it("returns true only when the collection is valid", function () {
$collection = new Collection();
expect($collection->valid())->toBe(false);
$collection = new Collection(['data' => [1, 5]]);
expect($collection->valid())->toBe(true);
});
});
describe("->count()", function () {
it("returns 0 on empty", function () {
$collection = new Collection();
expect($collection)->toHaveLength(0);
});
