public function testRemoveAtWithLength()
{
$collection = new Collection(['a', 'b', 'b', 'b', 'c']);
$this->assertSame(['a', 'c'], $collection->copy()->removeAt(1, 3)->toArray());
$this->assertSame(['a', 'b', 'c'], $collection->removeAt(2, 2)->toArray());
}
