/** @test */
public function should_return_the_item_keys()
{
$keys = $this->collection->keys();
$this->assertEquals([0, 1, 2, 3, 4], $keys);
}
/** @test */
public function should_return_the_item_keys()
{
$keys = $this->collection->keys();
$this->assertEquals([0, 1, 2, 3, 4], $keys);
}
