public function test()
{
$e1 = new Entity(['id' => 1]);
$collection = new Collection([$e2 = new Entity(['id' => 2]), $e3 = new Entity(['id' => 3])]);
$collection->prepend($e1);
$this->assertEquals([['id' => 1], ['id' => 2], ['id' => 3]], $collection->toArray());
}
