});
describe("->first()/->rewind()/->end()", function () {
it("returns respectively the first and the last item of the collection", function () {
$collection = new Collection([1, 2, 3, 4, 5]);
expect($collection->end())->toBe(5);
expect($collection->rewind())->toBe(1);
expect($collection->end())->toBe(5);
expect($collection->first())->toBe(1);
});
});
describe("->valid()", function () {
it("returns true only when the collection is valid", function () {
$collection = new Collection();
expect($collection->valid())->toBe(false);
$collection = new Collection([1, 5]);
expect($collection->valid())->toBe(true);
});
});
describe("->count()", function () {
it("returns 0 on empty", function () {
$collection = new Collection();
expect($collection)->toHaveLength(0);
});
it("returns the number of items in the collection", function () {
$collection = new Collection([5, null, 4, true, false, 'bob']);
expect($collection)->toHaveLength(6);
});
});
describe("->merge()", function () {
it("merges two collection with key preservation", function () {
$collection = new Collection([1, 2, 3]);
