Testing services manually, or even with a carefully crafted shell script, isn't really easy. Furthermore, if you require some kind of complex test, using scripting may prove to be just too hard. Postman can be used to write tests for services, to organize them into full testing suites, and to document the way your RESTful API works. You can also use it to mock services or as a help in development, but we won't be getting into that here. In this recipe, we'll focus on the testing aspects.