[9.x] Add test for add method in Collection (#43440)
[9.x] Add test for add method in Collection (#43440)


arturock/framework,driesvints/framework,lucasmichot/framework,laravel/framework,hafezdivandari/framework,arturock/framework,driesvints/framework,laravel/framework,lucasmichot/framework,arturock/framework,hafezdivandari/framework