Book Image

API Testing and Development with Postman

By : Dave Westerveld
1 (1)
Book Image

API Testing and Development with Postman

1 (1)
By: Dave Westerveld

Overview of this book

Postman enables the exploration and testing of web APIs, helping testers and developers figure out how an API works. With Postman, you can create effective test automation for any APIs. If you want to put your knowledge of APIs to work quickly, this practical guide to using Postman will help you get started. The book provides a hands-on approach to learning the implementation and associated methodologies that will have you up and running with Postman in no time. Complete with step-by-step explanations of essential concepts, practical examples, and self-assessment questions, this book begins by taking you through the principles of effective API testing. 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. You'll then be able to try some hands-on projects that will teach you how to add test automation to an already existing API with Postman, and guide you in using Postman to create a well-designed API from scratch. 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 (19 chapters)
1
Section 1: API Testing Theory and Terminology
6
Section 2: Using Postman When Working with an Existing API
13
Section 3: Using Postman to Develop an API

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. Create a new environment called Newman Test Env.
  2. Modify the URL field of the Test GET request to...