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