Book Image

API Testing and Development with Postman - Second Edition

By : Dave Westerveld
5 (1)
Book Image

API Testing and Development with Postman - Second Edition

5 (1)
By: Dave Westerveld

Overview of this book

Postman is an invaluable tool for exploration and testing of web APIs and helping testers and developers figure out how an API works. With Postman, you can create effective test automation for any APIs, and this guide will help you unleash its full potential. API Testing and Development with Postman is an invaluable resource for anyone who wants to create a good quality API, but isn't sure how to go about it. This guide will help you unleash the full potential of Postman’s test automation capabilities. A combination of theory coupled with real-world examples will help you learn how to use Postman to create well-designed, documented, and tested APIs. After you’ve familiarized yourself with the theory, you’ll move on to hands-on projects that will teach you how to add test automation to an existing API. You’ll also learn some of the new and powerful features that Postman has that can help you avoid introducing bugs. This second, fully updated edition features new chapters on workflow testing, creating and using mock servers, API security testing, and performance testing. The new and expanded information in this edition will help you future-proof your APIs. By the end of this book, you'll be able to use Postman to set up and run API tests for any API that you are working with.
Table of Contents (12 chapters)
1
API Testing and Development with Postman, Second Edition: API creation, testing, debugging, and management made easy

Understanding Newman run options

Now that you have Newman installed and running, it's time to look at how to use it in a variety of cases. You have already seen how to run it with a simple collection, but what about if you have environment variables or data-driven tests? In this section, I will show you how to run Postman collections, including collections that contain environment variables and data-driven tests. I will also show you some of the options that you can use to control Newman's behavior.

Using environments in Newman

Often, a collection will have variables defined in an environment. Requests in that collection will need those variables when they are run, but the values don't get exported with the collection. To see this in practice, you can modify the Test GET request in the Newman Test collection that you made earlier by following these steps:

  1. In Postman, create a new environment called Newman Test Env.
  2. Modify the URL field of the Test GET request to set the...