Which tool is commonly used for manual testing of RESTful web services?

• A. Postman
• B. Selenium WebDriver
• C. Cucumber
• D. JUnit

Answer: (A)

Postman is widely recognized as an effective tool for manual testing of RESTful web services due to its user-friendly interface and powerful features that facilitate API testing. It allows testers to send HTTP requests to web service endpoints and inspect the responses with ease. This capability is critical in verifying the functionality of APIs, as testers can check the status codes, response times, and the actual output returned by the services.

In addition to making requests, Postman can be used to organize these requests into collections, execute them, and automate some testing processes. It also supports various authentication methods and allows testers to easily manipulate request parameters, headers, and body content to conduct thorough testing of RESTful APIs.

Other tools mentioned in the choices serve different purposes: Selenium WebDriver is primarily designed for automating web applications for testing purposes, focusing on front-end testing rather than RESTful services. Cucumber is associated with behavior-driven development and is commonly used for writing automated acceptance tests in a language that stakeholders can understand, but it is not primarily for manual testing of APIs. JUnit, on the other hand, is a framework for writing and running tests in Java, often used for unit testing and not specifically tailored for manual API testing.