On the Codeception blog (an up and coming PHP-based testing tool) there's a new post showing how to use the tool to test your web services for either a SOAP or REST-based service.
Codeception testing framework got significant improvements during last week. The first and the major one is that you don't even need PEAR and Composer to execute tests. Only one file codecept.phar required. This might save your time and mind of your testers.
They've recently added modules for SOAP and REST support, making it easier to define your tests in a more fluid fashion. Included in the post are two examples, one REST and one SOAP. You can find more information about these new testing features over in the tool's documentation.