We are using Groovy to test our RestFUL API, using a series of helper functions to build the xml put/post/gets and then a series of tests on the nodes of the XML to check that the data is manipulated correctly.
We use Poster (for Firefox, Chrome seems to be lacking a similar tool) for hand testing single areas, or simply to poll the API at times when we need to create further tests, or check the status of things.
There is a free tool from theRightAPI that lets you test any HTTP based API. It also lets you save and share your test scenarios.
We use Groovy and Spock for writing highly expressive BDD style tests. Unbeatable combo! Jersey Client API or HttpClient is used for handling the HTTP requests.
For manual/acceptance testing we use Curl or Chrome apps as Postman or Dev HTTP Client.
I use http://hurl.it/
Ha. Sorry, I mis-read your post. I've used cucumber to test it before. It worked out nicely.
http://www.quadrillian.com/ this enables you to create an entire test suite for your API and run it from your browser and share it with others.
If you're just testing your APIs manually, we've found RestClient 2.3 or the Poster add-on for Firefox to be pretty helpful. Both of these let you build requests that GET, PUT, POST, or DELETE. You can save these requests to rerun later.
For simple automated testing try the Linux (or Cygwin) 'curl' command in a shell script.
From something more industrial strength you can move up to Apache JMeter. JMeter is great for load testing.
31 October 2014: HTTPRequester is now a better choice for Firefox.
July 2015: Postman is a good choice for Chrome
We're planning to use FitNesse, with the RestFixture. We haven't started writing our tests yet, our newest tester got things up and running last week, however he has used FitNesse for this in his last company, so we know it's a reasonable setup for what we want to do.
More info available here: http://smartrics.blogspot.com/2008/08/get-fitnesse-with-some-rest.html
We test our own with our own unit tests and oftentimes a dedicated client app.
I am using DevHttpClient Plugin for chrome, its handy. it does also saves previous actions. clean UI as well
Postman in the chrome store is simple but powerful.
Source: Stackoverflow.com