Web services are commonly used in the communication of software over the web. To fully trust a web service, it should be tested and certified, but testing of web services provoke new challenges. Behavior-Driven Development (BDD) can be applied to the testing of web services. Gherkin language is used to define scenarios in BDD. We used Gherkin language to define test cases for web services and we developed a tool to convert these test cases into JMeter test scripts.