测试REST API的最佳方法是什么？

I just created a REST API using the PHP Slim Framework. However, I would like to know what the best way would be to test out this API would be. Is it best to test it out using PHP or objective-c (where it will be used) or via some online service which allows you to test out a REST API? All outputs are in JSON. I just created a REST API using the PHP Slim Fr